TBI to Carb Swap

[@dylanbout2630]

watching this video because I'm swapping my tbi 454 to carb. when I hit like on the video It was the 454th like . Wild 😆

[@thewoodsman5261]

Nice job man on both the video and the work under your hood. Back in November I picked up an old 77 Sierra K15. Whoever owned it before me dropped in a 5.7 TBI with a 700R4 and np205 transfer case out of an 87 Suburban. Nothing has been hooked up. I'm an old guy who grew up around carburetors and old square bodies. The easiest thing for me to do is a carb swap. Your engine bay looks sweet man, it's clean no clutter beautiful work

[@kerrycarrizal6311]

Ok sounds good, I also putting a 383 stoker motor in mine this weekend. Went with a built 7004r with a 2800 stall and 411 Posi in the rear. Thanks for your help and I will probably be asking more question. Thanks again

[@Generalpurpose702]

Nice valve covers, I have those on my 289

[@jimagnew1643]

Do your covers have baffles? Mine don't, oil shoots straight up through the holes . The hole is right above the rocker arm.

[@benjaminp6924]

Right on cool ride and project looks good, I carbed a 01 Express and now doing a 88 G30

[@ModdedProjectsGarage]

Thanks! Good luck on the 88 👍

[@mikevickers4727]

@@ModdedProjectsGarage Aawae asada

[@enlilstyxx1011]

GREAT video, finally a CLEAR video I could take a few screen shots for reference, I have an '88 Square body, its not necessarily the oil pressure switches, its mainly just having Keyed power, you can pull power from the Purple w/ White tracer that went to the 4 pin connector on the distributor to the TACH connection if you were running an HEI, then put the power wire from the old coil to the BAT connection on the HEI, or do like you did with the MSD box, I used the MSD Pro Billet that has everything built in including rev limiter an external coil.. My wiring harness I stripped back and labeled keyed or non keyed, etc then brought them back through the boot and coiled the tails under the dash in case I want to use them later for any accessories. Where the AC was is that a block off plate? I'm looking at getting rid of the factory unit and going with the cleaner looking Vintage Air unit, I went with the Brodix heads, tried 2 sets of edelbrock heads an they were Both junk, I wish I had looked at some of the horror stories on Utube before buying, I dont have the provision for the temp sensor in the head but it was just for the TBI anyways, the one at the thermostat is for the gage, again absolutely FANTASTIC JOB!

[@samsquantch14]

thats a beauty! my folks have a 94 suburban with the 350 tbi. made a comment to my pops that we should 5.3 swap it and he said "to hell with that fuel injection crap, the old 350 tbi with a carb swap would eat it up" ..thats how i got here lol

[@ModdedProjectsGarage]

😂😂 that’s awesome

[@dwaynebottcher8714]

Very nice job and very clean 👌

[@jimmyhensel5752]

Doing the same exact swap and nearly everything except I went with the hei distributor with the coil integrated in the cap. It’s a lot of stuff honestly. I’m a senior in high school. Doing my best to get my motor in and going for prom. I have an 1987 Chevy V10 Silverado

[@ModdedProjectsGarage]

Nice! I hope you get it going so you can drive it for that 👍 I wish I still had mine, but I just didn’t have the time to get it done with my family expanding lol. Best of luck and have fun with it!

[@DavidB7474]

Yours is a late 1987 model square with Tbi. I’ve seen a few of these. Know someone who is the original owner with one. All obs trucks in 1988 got Tbi. The oil pressure transmitter has to see pressure for the fuel pump to operate. It’s a fail safe if you loose oil pressure. There are some instructions on what to bypass online.

[@apriljohnson421]

Wow! I love this. I sure wish I knew someone like you to restore my 89 Dodge d100 that has a 318, 5.2 liter tbi, but I live in Atlanta. Your engine bay is a beauty!

[@ModdedProjectsGarage]

Thanks! 👍👍

[@TheREV442]

Sup april get at me i walk u thru

[@trillrifaxegrindor4411]

have confidence in yourself,it isnt much harder than making a 5 course meal or writing an essay

[@2010HarleyDynaFXD]

I converted my 93 Cadillac Fleetwood from TBI to carburetor because TBI doesn't like big cams high flowing heads and engines that push way over 350 horsepower. I absolutely love working with the carburetor. I don't even touch it really after initial tuning it just fires right up and goes. My TBI was having ton's of issues I rebuilt it and everything still had issues with the TBI so I did the next best thing build the engine to the point that TBI is useless lol!

[@Generalpurpose702]

I have a msd box and a msd pro billet distributor with the msd wiring harness for the dual connector distributor, it was all plug and play on my 1995 Chevy, and I have a edelbrock 650 carb 3:50

[@jimagnew1643]

Do your valve covers have baffles, under the P,V, C , valve, my Elderbrock do not, the rocker arms, Shoot oil straight into the p,v,c, into the carburetor, l thought I was having a Engine problem, Until I took the cover off, and looked under it, Someone told me, i have the kind that is just for show. It's the same on the other cover, for the push in breather , vaper comes out, GOING down the hwy, What is the part number, ON the Regulator, How did you get the right length, braded fuel lines ? And from what Auto parts company,

[@frankdatank7751]

Awesome setup!! Carb is a much better upgrade from the stock tbi, I will encourage you to get a afr guage. Afr guage will tell you where your carb is rich or lean, thats the best thing I did when I went to a carb, very easy to tune and rejet with the afr guage!

[@ModdedProjectsGarage]

Frank da Tank yup! Already have one! I used the o2 bung from my TBI for the AFR gauge. Very nice to have while tuning! 👍

[@oscarvillarreal8951]

@@ModdedProjectsGarage are the AFR gages still good?

[@arnulfob3454]

Well done , it looks great

[@ModdedProjectsGarage]

Thanks!

[@Vr6.christos]

I have a 87 r10 as well It has a 305 (not a bad engine at all) I’ve been wanting to do a carb swap for awhile now this video will help a lot. Been to scared to do it because I don’t what all the computer is connected to

[@ModdedProjectsGarage]

Yeah it really wasn’t to bad to do. I was on the same boat as you as far as a little nervous to start it. The only issue I’m having now is at wot I lean out. It maybe because I need a better fuel pump or the carb isn’t adjusted just right. I haven’t put a ton of miles on it yet because I’m still in the process of painting it. I hope the video gets you started in the right direction! If you find anything out while doing yours make sure to comment what you find to help others! 👍

[@swatson0061]

Clean truck Bro

[@ModdedProjectsGarage]

Thanks!

[@swatson0061]

@@ModdedProjectsGarage Do you remember what fittings you used to tap into the factory fuel system?

[@josephquinton990]

About your choke,use the red/black wire coming from the driver's side harness that went to your throttle body injectors.also I bet your got alot better fuel mileage too.

[@Generalpurpose702]

I have a msd box and a msd pro billet distributor with the msd wiring harness for the dual connector distributor, it was all plug and play on my 1995 Chevy, and I have a edelbrock 650 carb

[@DavidB7474]

I still run the Tbi on my 92 Silverado. It’s the same Ecm, same Tbi units used in the trucks and cars. And it’s useable on my 350. 1990 iroc 350 heads, 083 castings, small chamber, milled, gives me 9.7:1 compression, small vortec hydraulic roller cam, rebuilt Tbi, larger cop car injectors, air horn cleaned up and milled off. Custom burned chip. 17 mpg at 80 plus. Moves the 4400 pound shortbed out pretty good. And mine is also a 5 speed. I have gone back and forth with changing the Tbi to carb. Hard to argue with 17 mpg and there is no way I could run 87 octane with my compression and a carb. The timing still controlled by 7477 Ecm. Ran this setup before I got the custom chip and 7477 Ecm and it demanded 93 octane. For me it was worth keeping the Tbi. I have a few big block Tbi units. When I change to those I will get another chip burned for the application. You have to have a tps and the TV cable for the 700r4 to shift properly. For those with the heads with the 4 bolts in the middle at the different angle, the china made rpm air gap intakes from professionals products come with the spacers for the 4 center bolts so you don’t have to grind an intake. Tbi pumps are 14 psi pumps. Maybe I will go carb. I run all msd on my 74 Camaro. I have looked at msd adapter wiring to hook all msd into the factory harness so I won’t have to cut anything, maybe have to cut the msd adapter harness. But factory wiring stays intact. If I get to that point in power. My custom chip removed the factory rpm cut off and fuel cut off.

[@benjaminlafferty902]

What is the regulator part number?

[@thedobermangang3503]

i should have listend to you...i learned my lesson..i been thro hell and back trying to get my engine to run right..

[@thedobermangang3503]

hey i like to hear it run do u have a video with it running....

[@flowersand102others5]

Thank you for this

[@ModdedProjectsGarage]

Hope it helps!

[@danielalvarez8159]

I'm tryna do tht same set up man ....if you can shoot me a list of everything you did a bought for tht set up .I'd appreciate it

[@alonzomendoza5393]

I had a carb on my c10 383 for a few years just switched to Holley efi I’m pretty happy with it super simple conversion. But I do want to do a carb swap on an old tpi camaro I have lol I’m all over the place

[@johnnyyarborough7498]

I have an 87 Silverado, just dropped a 383 in it, I really like your fuel pressure and fuel lines setup, could you please send me all the line & connection sizes to complete this same setup. I'd really appreciate it. Awesome setup.

[@oldschool-ef4jz]

Fuel lines size adapter needed to connect the fuel line feed is 16mm × 1.5 to 6an return size 14mm x 1.5 to 6an

[@oldschool-ef4jz]

Adapter will fit factory line so you DON'T have to cut anything

[@ModdedProjectsGarage]

Steve Carter thanks for the sizes! I couldn’t remember what they were. You are correct on NOT cutting anything! The new lines will screw into the existing ones under the cab 👍

[@latoren82]

Hello, I done, well my mechanic done the same exact swap on my 1987 SWB but I went with the Edelbrock Carb. My 383 cranks and idles fine but falls on its face when I accelerate. Thanks for the vid, I will look and see if he removed all those pressure gauges you’re speaking of because I am having fuel problems.

[@ModdedProjectsGarage]

I actually have a similar issue. I just attributed it with my carb being out of whack. I haven’t prioritized it yet since I need to get it all painted and put back together. Let me know what you find out. On the other hand I plan on ditching the stock pumps shortly and will probably just run a switched fuel pump with a fuel cell.

[@latoren82]

Thanks for the response! I been through 3 new carbs thinking it was that but 2 of them gave me the same symptoms so that eliminated the carb being the problem. I will follow you on KZbin to see your finished project!

[@ModdedProjectsGarage]

CoastLyfeKustoms thanks! I appreciate it!

[@trillrifaxegrindor4411]

coastlifecustoms has a mechanic do his work?

[@latoren82]

@ trillrif axegrindor Yes my mechanic installed the Holley Carb and it was running really well for Day! Sad and Happy to say he isn’t my mechanic anymore. After driving for one day and burning my 3rd gear in my transmission up because he installed my throttle cable with tire wraps instead of getting the $25 bracket to give the correct setting for the Holley Carb and the 700r4! I’m no mechanic so I didn’t know anything about it. So, if you’re running a Holley with 700r4 doing use tire wraps nor the throttle bracket supplied with the carb. Please go out and order the throttle bracket for this application.

[@panzermk4953]

Thank you for those video my Tbi has nothing but garbage

[@ModdedProjectsGarage]

Yeah once it starts going bad it can be a really pain.

[@TheUndertoe]

I’ve got a tbi 350 with a comp cam and lifter kit with a comp cams double roller timming kit and it does alright nothing crazy lol they work pretty well for a old school setup

[@ModdedProjectsGarage]

👍 nice! do you know the cam specs by chance?

[@TheUndertoe]

@@ModdedProjectsGarage Duration at 0.50 inch Lift:206 int./210 exh Advertised Duration:258 int./262 exh Valve Lift with Factory Rocker Arm Ratio: 0.458 int./0.458 exh. Lobe Separation (degrees):111 Here’s the link to it as well - www.summitracing.com/parts/cca-cl08-409-8

[@ModdedProjectsGarage]

@@TheUndertoe 👍 any other mods done? Tuning etc on the TBI or did you just put it in and go? Looking at maybe doing this to my 90 gmc, but I want to keep it reliable for a daily

[@TheUndertoe]

@@ModdedProjectsGarage nope the truck has the stock computer I never really messed with anything the previous owner put the cam in. Does seem to run rich here and there but not bad it’s pretty drivable gas mileage is about average 10-12 is what I get

[@waynew2831]

I have a TH400 trans in my "88 Chevy truck. What, if anything, did you have to do with whatever wiring went to your trans?

[@robertjohnson6013]

Of your Computer wiring Removal, Removed My TBI also But Left Wiring. Disconnected all controls under hood, But Question Weather to Remove Computer from under Dash. Did Drive Into Work one Day but had a Shut down on Return to House after Work. Started Back up and Got Home. But at house Replaced all Spark Plug Wires To Find Water Heater Sending Unit Wiring Disconnected Due damage harness connect to Heater sending unit. But after Getting Home Been Starting Truck up Warming Up and it Shuts Down after 10 - 15 Minutes. And will Not Restart Due To No Fuel Pressure. Waited couple Days Started Back Up Ran for Few Shut down again. So in Question of Heater sending Unit Disconnect ( got one in The Mail Coming) But Still In Question of Computer still in Place or Remove ? Any Advise would Be Help This TBI was a Problem Glad to remove go Carburetor

[@coolacadien]

Did you have to replace the fuel pump? What’s your fuel pump pressure?

[@kerrycarrizal6311]

Thank you on the part numbers. I order everything through Jegs. I was going through the wiring to the old throttle body. Is the only wire you are using is the pink wire? I have a HEI distributor and I was going to use the pink wire to power it up. What wire runs the fuel pump. Can I cut out all the plug going to the throttle body or should I keep them. Thanks for your help

[@ModdedProjectsGarage]

Kerry Carrizal use the pink wire to run your distributor. Leave all of your wiring alone until you test run it before you start cutting wires out.i didn’t have to mess with any of my wiring to keep the fuel pump running. The only thing I had to do was make sure my oil sending unit and pressure gauge were hooked up along with a ground wire that goes to the back of the passenger side head. Haven’t had any issues with the fuel pump yet. 👍

[@jimhofer9244]

What about your intake ? The heads are different for the tbi engine. At least with an 87 or newer

[@road2richz_q266]

Hey I have a 90 Silverado I did a carb swap on mines as well, but I'm having issues with my fuel pump staying on while the engine is running so I do need my factory oil pressure sensor connection to allow my fuel pump to continue to run, now my next question is did you use your temp sensor from harness?, because my engine temp gets to the highest temp on my mechanical temp guage after running on idle for about 10-15 mins

[@bigcountry4539]

What's the "MSD" box for?

[@cenzolyksitruff]

pretty clean man, im curious what you meant about the oil pressure controlling the fuel pump? Factory tbi computer? And would you happen to have the part number for the lokar bracket and cables? Thinking of swapping my 94 2500 to carb and its been about 5 years since ive messed with any carb stuff. Thanks in advance

[@robs_garage0278]

Im looking to carb swap my 1992 gmc c3500hd 454 from tbi but im trying to do it on a budget what is the best carb and intake i can use that is not to pricey

[@ethangordon388]

Is this the 87 block? If so how did you get the intake to fit properly, I know they changed the center bolt on the intake for the tbi

[@ModdedProjectsGarage]

The block is late 90s with aftermarket aluminum heads so I didn’t have to worry about that issue 👍

[@ethangordon388]

Modded Projects Garage Ok thanks good luck

[@haniballecter7605]

can you use a edlebrock performer carb intake on tbi heads without having to do anything or do you have to drill out the middle 2 intake bolt holes to make it fit , thats what ive heard but i dont know how true it is , thanks

[@davidhill5181]

What wires to bypass the oil pressure switch?

[@AugustSch]

How much harness did you get rid of? Did this on an 87 Chevy. Having a problem with my trans shifting at 3000 at WOT , it’s a th400 with the vacuum line going to the trans which I have hooked up. Thanks

[@ModdedProjectsGarage]

Proffesser Outasight I cut out everything that wasn’t hooked up anymore. I have a 700r4 in mine and I haven’t had any issues with the trans. Try this link out and see if it helps. www.onallcylinders.com/2014/12/19/ask-away-hook-turbo-400-kickdown-hint-like-3-speeds/

[@AugustSch]

ModdedProjectsGarage thanks man, hopefully I didn’t damage anything. Once I noticed the issue I didn’t romp on it I babied it around cause I knew it wasnt right

[@roadsidecustoms7622]

I’m possibly getting an ‘89 with a 350 tbi, and I was wondering if I’m able to use the factory fuel pump and use a regulator and then just run it to the carb

[@kerrycarrizal6311]

Hello Kerry here, will got my truck running this morning and the 383 stroker runs great but I have one issue hopefully you can help me out. Here it is once I kick the key on the fuel pump turns on and you can see the fuel gage hit 5 psi then you hear the pump turn off. The truck will run until it runs out of fuel. You can see the fuel gage drop to zero but the fuel pump never turns back o. Once it runs out of fuel you can cycle the key once again and the fuel pump turns on and does the same thing. Any suggestions. Thanks again

[@ModdedProjectsGarage]

Kerry Carrizal do you have your oil pressure sensor and oil sending unit hooked up and are they working? From what I remember reading on this if your computer sees you still have oil pressure it will keep your pump running. I haven’t had this issue on my truck. What year is your truck?

[@kerrycarrizal6311]

1987 just figured it out I had put 12 volt power when the key is on. Had to cut the green and white wire to the fuel pump and 12volt to it and no more problem. Now I hear it running when its running. Thank you again

[@ModdedProjectsGarage]

Kerry Carrizal thanks for posting! I’m sure it will help other people if they come across the same issue! 👍

[@jjmccloud]

What size spacer was needed? Just a 1"

[@ModdedProjectsGarage]

I needed at LEAST a 1” spacer for my fitting to fit

[@jjmccloud]

@@ModdedProjectsGarage im tore between a 1" or a 2" , don't have the carb here infront of me yet so hard to judge which to go with and know if the 1" will be enough or not

[@brandoncampbell7768]

What kind of fuel pump do you have

[@ModdedProjectsGarage]

I was running factory fuel pump to the regulator with a return

[@glenray4179]

I have an 89 c1500 replacing with a 383 block was cast in 1969 . the 350 before had a throttle body with 4 wires on the harness to the distributer and this one only has three what do I do?

[@ModdedProjectsGarage]

You should be able to take the big red/pink wire that I used and run it into the Battery slot on your hei distributor

[@apollomartinez8162]

Did you remove ecu

[@chevelleman673]

In the middle of complete rebuild on a 87 engine going back with a carburetor would like to ask a couple of questions like fuel lines fitting size because I want to connect at the junction point under the cab and questions about the wiring THANKS Steve

[@ModdedProjectsGarage]

I can’t remember the fitting sizes on the fuel lines underneath the cab. I did take the stock fuel lines into a local speed shop and he gave me the correct sizes. I ran those lines up to the regulator with -6 an fittings.

[@oldschool-ef4jz]

@@ModdedProjectsGarage Thank you

[@tommybroughton2191]

I just purchased a 95 GMC pick up and it has been swapped to a carburetor and I am having fuel issues do you think it could be caused by them possibly not removing the factory fuel pump, it it running off a manual pump on the motor

[@ModdedProjectsGarage]

So you’re running a mechanical pump on the block?

[@jorgequintana783]

Hey buddy I’m doing the same thing I have 92 c1500 with tbi and I have a freshly built 383 with a big cam and alluminum heads that’s going to be carbureted so my biggest worry was how to bypass the computer and how I could setup aftermarket gauges for fuel pressure and oil pressure and engine temp did you have to by pass the computer or deleted and if so how did you do that ? Thanks

[@ModdedProjectsGarage]

I just got rid of the wiring I wouldn’t be using anymore. As far as gauges go I just kept all of my factory gauges for oil pressure and engine temp. Only gauges I added that I can think of were the fuel pressure gauge which was mounted directly to my fuel pressure regulator and then I added an air/fuel ratio gauge. For AFR gauge you just need to add an o2 bung by your header collector and finish it up with some simple wiring. Other than those gauges I left everything alone. I used all of the same plugs in the head and block for my factory gauges and left the computer alone.

[@mobilemowers]

Nicest video of this swap in all the many videos I was watching ! Doing my 94 as as the engine will make 325 hp w Vorec heads and retro roller cam (posted my build here too). What an fittings did you use for the regulator ? Can you use pipe ones from the hardware store ? You talk slow and clearly no pointing fingers or hands everywhere. No every few seconds clicking loudly blower motor, clearly focus video, good lighting and shown from a foot away not right up super close.

[@djrowe10]

How did you manage the 4L60E transmission controller?

[@ModdedProjectsGarage]

It’s a 700 r4. It isn’t electronically shifted. It shifted via tv cable 👍

[@Powerstroke7911]

Does the MSD box make much of a difference? I’ve got a ‘92 GMC Yukon that I’m actually thinking of doing some of the same things (ditching the TBI for a carb, dual plane intake manifold, MSD, etc…..).

[@blairjosephbernard2011]

Let me guess Did you have pinging problem issues with the timing with the tbi. I’m having problems with timing pinging issue honestly I’m at the point gonna Smash the throttle body straight off the engine and put a carburetor on it got code 32/42/43. How much to do that set up

[@ModdedProjectsGarage]

I was having surging problems. Checked for vacuum leaks. None found. And replaced multiple parts in the TBI system. Still did it. I had the 383 stroker ready to go and knew the TBI wouldn’t handle what I was going to do to it, so I just ditched it all together. To get all the parts that I have just to get rid of the TBI I would say I’m in over $1k with carb, intake, fuel regulator, fuel lines, fittings and ignition. It can be done much cheaper though. I went with a pretty high quality setup because of my future plans with the build.

[@Lucky-sl6cj]

What all stuff did you need to ground out from the factory harness

[@ModdedProjectsGarage]

So everything that was not plugged in after the carb was on I just cut out. The main one that I forgot to hook up was the ground behind the passenger side head. My fuel pump wouldn’t run without that ground. Other than that everything that doesn’t need to be removed just stays where it’s at. It sounds really vague lol, but once you start the swap you’ll see. Hope that kind of helps.

[@danieldeleon8001]

Yeah there's not much you can do in terms of upgrades with the TBI engines. Instead of going back to a carburetor to restore some of those lost ponies that have gone to pasture I went the opposite direction and upgraded to multi port fuel injection. I have a 91 single cab short bed 1/2 ton 2 wheel drive Chevy 5.7. I went into the bottom end and and replaced main bearings and piston rings. Then I swapped the heads for some junkyard vortec heads. Swapped the cam for a pretty aggressive Comp roller and did a valve job to match the cam new lifters and push rods. Holly dual plane intake with the Holly multi port fuel injection system and I robbed a fuel sending unit and fuel line from a wrecked 2007 Silverado and used fuel injection management programming recommended from Holly to run their multi port fuel injection system. I put a set of Eddlebrock long tube headers and ran duel 8inch Cherry Bomb glass packs 2.5 inch pipes dumped down under the bed. It's a little road eating machine now. Next I'm gonna drop it about 2 inches in the front and back, take care of the bodywork, redo the interior and seat, probably upgrade the dash cluster, and get it a nice new set of wheels and rubber to sport.

[@ModdedProjectsGarage]

That sounds like a real solid plan! It should be an awesome truck when it’s all said and done 👍

[@danieldeleon8001]

@@ModdedProjectsGarage and if this engine ever gives up the ghost then I'll probably just LS swap it. I'm really debating doing the bodywork and wheels though. I kinda want to leave it white with it's rust patches here and there. Make a nice little unsuspecting sleeper but of course do the interior.

[@ModdedProjectsGarage]

Yeah if I could go back I would’ve just left the body alone. I still would have lowered it and everything though

[@danieldeleon8001]

@@ModdedProjectsGarage well it's a 2 wheel drive so honestly it didn't feel right lifting it and putting big tires on it. Plus it was my grandpa's truck before I got my hands on it. He bought it brand new in 90 and he had until 2018. He always talked about dropping it and restoring it some but just never had the money. Front end was sloppy and the breaks could hardly stop the thing anymore. He refused to let me work on it or take it anywhere to get fixed. I told him I would pay for everything. He's just too good to ask for help. So I hit a police auction and found a 2015 4 door GMC 1/2 ton 35k miles on it for like $10,000. I took it by his house and said "I'll trade you trucks" and threw him the keys and used my spare to drive the sloppy jalopy home. We traded titles and I've been working on it ever since. I'm still thinking about dropping another 2 or 3 inches but I don't want it to be too conspicuous if I'm going for the sleeper look.

[@gabinosanchez1313]

How did your manage for your trany to work??

[@kerrycarrizal6311]

I did but just bumped it a couple of times and the fuel pump did go on. I didn't keep turning it it over just bump it. I have a new battery but today my truck wouldn't even kick the starter it was acting like it was the natural safety won't like the start kick. The only power I have to it is to the starter. Still it should kick on the fuel pump. Lights I don't get it. Blinkers work but no radio no dash lights or head lights

[@ModdedProjectsGarage]

Kerry Carrizal not sure what you have going on. Check fuses first and start going around with a multimeter to try and track down where the power is lost. Electrical gremlins are no fun!

[@kerrycarrizal6311]

@@ModdedProjectsGarage Ok will do. Thanks

[@thedobermangang3503]

WHAT TRANS U HAVE IN THERE

[@ClaytonGrafton]

I'm doing a similar swap to this. Did you need the knock sensor?

[@davewalters6348]

No.

[@harp440]

What happens to crank and knock sensor?

[@ModdedProjectsGarage]

I got rid of them both when I did the swap

[@kerrycarrizal6311]

Kerry here, update found the power issue. Ground to chassis was the problem. Motor was grounded but not the chassis. Have fuel pump working should be able to fire up this weekend. Thanks for the help.

[@ModdedProjectsGarage]

Kerry Carrizal good to here! Hope everything goes well with the start up!

[@kipbarksdale1758]

I’m doing a tbi to carb swap but have a question. So I took off the fuel pump block off to install a fuel pump but it looked different. There is supposed to be a little rod thing that interacts with the fuel pump. How did you do your fuel delivery? I’m guessing not a mechanical fuel pump as that didn’t work for me... please explain if you know

[@ModdedProjectsGarage]

The TBI trucks all have an in-tank fuel pump. They have a line that brings fuel to the TBI unit and there is another line for a return. I left the in-tank pump and just ran it through a fuel pressure regulator ( the TBI needs more psi than a carb). Once you regulate it down to around 5-7 psi you are good. If you go this route make sure you get a regulator with a return. For a mechanical pump you would need a fuel pump push rod. I know on later blocks they did not have a provision for that rod ( there was never a hole drilled for it). I’m not sure if that’s how your block was or not.

[@kipbarksdale1758]

Yeah my block doesn’t have the push rod which is the problem I ran into. I might go to scrap yard and pull sending unit out of an 87 and try to use that

[@curbsideeatstreats4514]

What kind of intake manifold did you use ?

[@ModdedProjectsGarage]

Edelbrock 7501 👍

[@kerrycarrizal6311]

Good day, Kerry here. Sorry to keep asking questions but I so close on starting the motor. Here's my question. I put the power to the starter, haven't hook up the pink wire to my hei distributor and wanted to hear if the fuel pump kick on once I turned the key on. Once I did there was no noise that it kick on and no pressure to my regulator. Do I need the pink wire hook up to the distributor so the computer recognizes it.What weird I don't have head lights or tail lights or no power to the cab. I have not cut any wires plug in all my stuff for the TBI to old distributor and still nothing. Any thoughts what it could be. I was hoping to have it running this weekend but doesn't look like. Thanks for any thoughts

[@ModdedProjectsGarage]

For the fuel pump, did you crank the engine over? Try cranking it over and see if the pump kicks on. And as for the power issue, do you have any power at all? Does the starter have power? Check you battery connections. If it’s just lights, check the grounds up in the radiator support and make sure they have a good ground

[@kerrycarrizal6311]

@@ModdedProjectsGarage I did but just bumped it a couple of times and the fuel pump did go on. I didn't keep turning it it over just bump it. I have a new battery but today my truck wouldn't even kick the starter it was acting like it was the natural safety won't like the start kick. The only power I have to it is to the starter. Still it should kick on the fuel pump. Lights I don't get it. Blinkers work but no radio no dash lights or head lights

[@JayreedontheBeat]

I’m actually doing the exact swap but I have a 94 blazer base 5.7l tbi I’m putting a carbureted 383 if I’m running a mechanical fuel pump with built in regulator do I still need to run an additional regulator like you did? Also if so where did you get that kit?

[@ModdedProjectsGarage]

No you shouldn’t need an additional regulator. I had to use the one in the video because I was still using the factory electronic pump and needed to regulate it down. No kit, just random parts meshed together to make it work 🤙

[@takelone4330]

I'm going to be putting a top end kit on, punching it out, drilling and polishing it, and getting it drilled and balanced on my 92 gmc sierra 3500k it has a tbi but im not to sure if i have to remove the tbi and put a carburated, carb on it because it wont give enough fuel to the intake. But i can get chips for it so it will increase the fuel and air ratio. Im wondering if i will need to put a carburator on it. Also will i have to do any thing with the computer, like flash it or something?

[@ModdedProjectsGarage]

I think that will really depend on what kind of cam you go with. I’m not to sure what the stock TBI and computer is capable of. That’s part of the reason I made the decision to go with a carb setup.

[@SOLDOZER]

Tell them "I got rid of the fuel injection because fuel injection sucks and carbs rule!".

[@oldschool-ef4jz]

Just exactly how of the wires from the original pcm did you wind up keeping and using ? Working currently on trying to eliminate as many of them as i can , does your truck still have the computer even in it ? I've been testing alot of the wires now seems the only thing that the computer controls is the distributor and timing Thank you for your help

[@ModdedProjectsGarage]

I only ended up keeping the wiring for the distributor and the oil sensors on the block. And obviously the alternator and such. From what I could understand the oil sensors are what turn on the fuel pump? I could be wrong, but mine still work after the engine is cranking. I cut a lot of wires out that were for the TBI unit

[@oldschool-ef4jz]

The truck I'm doing has the factory dual tanks and I'm working from the tanks to the front just to see exactly what all sends power to the pumps, I think the only thing that the computer controlled was timing and oil pressure switch control fuel pumps, I believe that there was a rollover safety switch to cut the fuel off , The truck is an early production 87 because my dad bought it in November of 1986 and the ecm seems to have been spliced into the wiring harness

[@Mangledduck28]

I'm thinking about doing this as well to my 87, even though the comps still in how does your 700r4 know when to lockup without the sensors hooked up to the tbi?

[@ModdedProjectsGarage]

Honestly haven’t driven it enough to see if the trans goes into lockup. I currently am in the process of getting it painted and haven’t had much time to drive it because it’s been apart. I’m actually going to be swapping it out for a th400 soon.

[@kerrycarrizal6311]

Hello, I'm doing the same swap do you have the part numbers on the carb linkage, also what length did you go on the throttle cable 36"or 24"

[@ModdedProjectsGarage]

Throttle cable is lokar tc-1000u. You only need the 24inch. Bracket is srk4000. KD2700U is the 700r4 tv cable. It will come with a bracket that attaches to the srk4000 bracket. I did end up having to make a geometry bracket for my demon carb. I have an older style one and they didn’t sell one for mine. Most carbs will have a geometry bracket to purchase for the 700r4 tv cable.

[@gabinosanchez1313]

Hiw did your manage for your trany to work?

[@daelanpellissier9670]

Did you get a check engine light from cutting so much stuff from the tbi? And if so how’d do you fix it?

[@ModdedProjectsGarage]

Check engine light was on before I did this. But I would definitely assume the light would turn on after doing it. It never bothered me and I didn’t even try and resolve the light issue

[@thordawgzbackyard1379]

I swapped my 89 Dodge RamCharger 360 from TBI to Carburator The only thing computer still runs is my Ignition to click on n my fuel pump connects to wire then there's one other wire that tells the vault regulator to click on alternator I wanna figure out how to get rid of that computer altogether!!! but as of right now I've cleaned up 80% of wires like u did n it's been like this for 4 years, I brought it in process n sux following behind someone's else Work n having 2 reput on better parts🤬 but it's still the same 360 in it!!! Lmk if u can help me figure out how 2 get rid of computer alltogether thanx!?!?!?!?!?!? N urs is Awezume!!! 383 thats a morpar engine HELL YEAH!!!💯🤘☠️🍻

[@oldschool-ef4jz]

On your coil did you use the ballast resistor that came with the msd coil because I'm doing the exact same setup other than I'm going with just a stock 350 with an rv cam instead of a 383 thanks Steve

[@ModdedProjectsGarage]

Nope. I have a ready to run style distributor and didn’t need to use a ballast resistor. I believe you only need to use that if you have a points distributor.

[@oldschool-ef4jz]

@@ModdedProjectsGarage ok , thanks just making sure because I using msd distributor that requires the msd 6al box , thanks

[@thedobermangang3503]

depending on the hp you got..the frist thing is to upgrade your fuel pump from stock and upgrade your exhaust now the msd box is not going to work right with that tbi you can forget about that..

[@ModdedProjectsGarage]

the doberman gang yeah I’m going to be running nitrous soon lol. Stock TBI definitely wouldn’t work with that 😂

[@clinteast7476]

you happy with it now? thinking of doing same

[@ModdedProjectsGarage]

Still need to do some tuning with it. I still have the truck mostly apart to paint it. It’s turned into a longer process that I would have liked 😂. It seems like I may have a fuel issue. It could be a carb tuning issue though too. It seems to lean out under full throttle. I just haven’t had many miles on it due to the bodywork and paint process.

[@brandoncasto615]

What were some of the problems you are having my 92 Chevy K 1500 has the throttle body on it and I sometimes can't get it to start after I shut it off but if I wait an hour it'll fire right up I kind of am figuring that it's in the computer somewhere or wiring but I can't find any information about why would be doing this and it's not very often that it doesn't either

[@ModdedProjectsGarage]

My TBI was having issues where it would surge like it had a vacuum leak, but I couldn’t find a leak anywhere. I replaced quite a bit of parts on the TBI and it never solved the issue. I had the same issue with the amount of info I could find and decided it wasn’t worth it anymore and when I was swapping to the 383 I didn’t want to mess with the TBI for it to work right with the hp numbers and cam that I was using. Just scrapped it and went with the carb!

[@cesarb9588]

Did you use stock computer

[@ModdedProjectsGarage]

1979 Monte carlo yup I left all of that alone 👍

[@thedobermangang3503]

hey what kind of big problems were you having with the tbi

[@samappler7832]

What fuel pressure regulator are you using?

[@ModdedProjectsGarage]

Holley hp billet 12-841

[@samappler7832]

Modded Projects Garage okay thank you, I’m doing the same thing but with a 2 barrel Holley car on the tbi intake

[@ModdedProjectsGarage]

Sam Appler cool, good luck with the swap!

[@ThumperDana]

When you swapped out the hard lines for the steel braid lines, do you recall what size fittings you used to connect? I know it's 3/8 up at the pressure regulator, but I need to know the other end.

[@ModdedProjectsGarage]

I don’t remember the exact size. I actually brought the hard lines into an auto parts store and they found what size I needed

[@oldschool-ef4jz]

Fuel line you will need a 16mm x 1.5 female: Return 14mm x 1.5 female

[@isaiahgramling1042]

What fuel pressure regulator did you run. If you can put the part number with it. Thank you

[@ModdedProjectsGarage]

Holley 12-840 is the regulator that I used.

[@jarrettdixon9850]

ModdedProjectsGarage did u use factory tbi pump with this?

[@ModdedProjectsGarage]

Yup I kept the factory TBI pump and just used a fuel pressure regulator with a return line

[@chicagovasko]

Perfect shyt what else you need. 😁

[@ridge003]

Did you cut your fuel lines all the way back to the pump or just to where the come up to the cab?

[@ModdedProjectsGarage]

Just to the cab. They actually unscrew which made it way easier!

[@ridge003]

Arron Benson do you remember the fitting part numbers and hose length ? I’m doing the same swap have the same fuel pressure regulator and all but not sure what fittings and such to use, I thought about using standard high pressure fuel line but I’d still have to find the fittings to go on the regulator either way lol.

[@duvlss_garage]

How did you power the fuel pump? I’m going with a big block and still not sure if I want to keep the stock fuel pump or use the mechanical one on the block

[@ModdedProjectsGarage]

I didn’t have to do anything to keep the fuel pump running. The only problem I had was when I put the new engine in there is a ground that was bolted on the back of the passenger side head. I didn’t have it grounded and the fuel pump wouldn’t turn on. Once I grounded it the pump started working again.

[@kerrycarrizal6311]

Hello, this is Kerry again. Ready to fire this weekend. 1 question what did you end up on your timing. Just like to get as close as possible. thanks Kerry

[@ModdedProjectsGarage]

Kerry Carrizal I have my initial at 18* and total at 32*. That’s going to be different for each setup though. I might have a little too much initial in mine. I haven’t had a lot of time to really get on it because I have been working on painting it. Sbc’s usually like 31-32* of total timing.

[@tata011670]

What plugs and wires are you using

[@Mechanism1777]

Robert Hersh looks like msd if I had to guess

[@trillrifaxegrindor4411]

carb is ALWAYS easier.it will drink so much more fuel though (thats great these days with $4-$5 a gallon fuel)and give you torque further up the rpm band...if you have tbi heads,this sucks because they are designed for under 4000 rpm torque

[@davewalters6348]

My gas milage is actually better with a 650 holley w/edlebrock performer manifold. Have to stay out of the secondaries thi 😉

[@davewalters6348]

EFI sucked up the gas as bad as any carb

[@savagenomore]

people: "why'd you get rid of the TBI" Me: "Because it sucks"....

[@ModdedProjectsGarage]

😂 exactly

[@oldschool-ef4jz]

Any chance you remember where you ran the wires coming from the fuel tank for fuel pumps power supply , I have 4 wires that come from the fuel tanks ( duel saddle) 2 inside cab for fuel gauge and tank selector . 2 other wires sent power supply it a a connector when 12 volts applied it will run the fuel pumps Thank you for any help or if I'm I'm totally confusing you I can get my phone number and we could possibly talk on the phone Thanks again Steve

[@thedobermangang3503]

hey my brother i take back what i said about keeping your tbi system saying its better because im having nothing but problems trying to get my blazer to run right i got a 1990 k5 blazer 5.7 just rebuld engine block 30 over did alot of up grades 3704 edelbrock intake headers tbi spacer injector spacer i got 700r trans i up graded my torque converter took the stock one out put in 2000 to 2400 stall put bigger cam in it xe262 h comp cam in it got 4.10 gears i change regulator spring to 18 psi had my tuner did my chip and let me tell u i cant get no power and the engine is pinging i think its going to be hard to get that fuel and timing correct with that big cam and them swirl port heads,,my tuner turn the fuel up on the chip he think he needs to advance the time on the chip..i dont no but im tried of going back and forward. i sholdnt have put them heads back on there..the tuner been doing this for long time but its hard for a tuner to get it all the way right and they in another state u need a date log so he can have something to go on..looks lke im going to be doing the same thing you did i actually were thing about doing a efi sniper or atomic efi...

[@bamakris100]

What headers do you have on it ? I’m currently swapping my 87 to carb from tbi because I’m building a engine tbi won’t handle .

[@ModdedProjectsGarage]

bamakris100 I just used some flowtech headers. I scuffed them with a red scotchbrite pad and then painted them with black high heat paint

[@thedobermangang3503]

hey tbi is always better you should have left it like it was i will never go to a carb..i have a 1990 k5 blazer im rebuilding engine now i have the block bored 30 over so its a 355 now anyway good video my brother.

[@ModdedProjectsGarage]

the doberman gang there’s no way the factory TBI setup would have worked well with what I’m doing. If I go back to fuel injection it will be an aftermarket kit. Good luck with your build and I hope everything goes well! 👍

[@rookie12101988]

"Why did you get rid of TBI" cause its trash and never works.

[@ModdedProjectsGarage]

😂😂

[@Broncobob88]

For the amount of money you will spend to get it working again you might as well throw it away and upgrade to performance parts and get some extra power out of that engine.

[@justinnye925]

The simplest answer to get rid of tbi is gutless and to top it off no one makes a tune or anything for the tbi so your very limited on what you can do carb is wayyyyy better anyway

[@kerrycarrizal6311]

Thank you.

[@thedobermangang3503]

that tbi all you had to do is to get something to reprogram your chip for you and it would have ran find..

[@ModdedProjectsGarage]

the doberman gang a 400hp engine on nitrous wouldn’t have been fun with an old TBI and dinasaur computer. 🤷🏼‍♂️