Chevy Tbi running rich problem solving

If your chevy gm tbi is running rich this will help you trouble shoot it and fix it
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[@CodytheCarGuy]

Check out Www.snacksforme.com for some of the best snacks!!

[@johnny30806]

Also right next to the temperature control sensor is the ground wire for the brain.clean it up and make sure you got a good ground. Most people usually overlook this

[@wranglerellis9214]

What color is that ground???

[@johnny30806]

@@wranglerellis9214 All grounds are black

[@mattireland9218]

Not only solid info but easy to listen to. No wasted time with bullshit small talk about how the vehicle belonged to his friends uncle brother in law's so n so. Thank you for your knowledge sir!

[@robertosoto3746]

Yes that's what I'm talking about. Short and sweet we don't care about the other bs.

[@floydindursky2973]

I swapped a 305 out of my old rotted 92 Chevy van into a Clean 93 GMC Pickup. It was running like crap till i saw your video and Changed the Engine Temperature Control Sensor! It runs Great Now!! Thank You Soo Much for Making this Video!!

[@gnarleymarley1914]

Man this really helps a lot! My idle rpms this winter are normal at startup but increase to 1100 after a few minutes. I've changed out the IAC and did notice the throttle body gasket did not fit well. I'm going to follow your advice and when I get it fixed I'll let you know. This is an excellent video, one of the best I've seen!

[@USdefender1]

I know I'm late to the game, but I've just got my 91 GMC Sierra with a 350. My engine is running rich, and after watching your video, I have the confidence of a seasoned mechanic that I can fix it. You are a great teacher. Thanks.

[@wildestcowboy2668]

Did you get the POS fixed yet?

[@markstewart8171]

​@@wildestcowboy2668lol probably not, im driving a polished turd as well.

[@coyotech55]

This is a big help - thanks! I got an '88 Chevy 2500 from a friend, and he did a lot of work on it, and we did some more before I took it home, but it's having fuel problems still, that showed up after I'd used it a little. I think this info will help me get the old truck roaring down the road again.

[@rcdesmond]

I was dreading having to figure out my 92 350 Fuel dumping issue but not no more, Thanks for the confidence boost. :)

[@marcusrivera177]

Thumbs up from me. Ran across this video last year, but thought it was my injectors from running the tank empty. Replaced injectors ( with used), ran good for a month and started acting up again. I chalked it up as my trucks a POS and this is how it runs. FINALLY got too tired of the hard start and having to feather the gas to keep it running when cold. Went to my DIY teacher ( youtube) and stumbled across your video again. A quick 5 minute replacement of that part and my babies purring again like the good ole days!

[@dirtykustomz]

Bro if you tell me jump of a cliff I will , everyone listen to this man ! I just got my 87 R10 it sat forever so I replaced the tank pump fuel filter plugs wire and rotor shit was still running like shit when I saw his vid talking about the temp sensor I was like what shit is this so wtf I have to lose I got one installed and it worked no Fuchs,,,,,,,,, way I could not believe it I still can’t . Cody let me send you a bottle of whiskey bro just say where and is done .. you’re a boss thank you .

[@adolforggalang3273]

I had a severe flooding problem..Engine starts if one of the tbi injector was disabled, it was flooding so bad that it literally doubled the amount of oil in the oil pan because it was no other place the gasoline can go!! So I replaced the the temp control sensor as per Cody's suggestion and sure enough it solved my problem..Thanks!!!!!! By the way you can disconnect the sensor temporarily to test it to see if there is any changes...I did it on mine and it run better then I purchased one and replaced it solved my problem...

[@briantruck2284]

Been running it unplugged for years

[@themadddtrucker3426]

Just bought a 95 two door tahoe.... ran rich as hell. Couldn't find anyone else doing throttle body videos..did all the checks you suggested....now it runs great!!. You sir just got a new subscriber!!

[@joshuakuhn6]

This video is a lifesaver thanks. Started with the ECT 15minutes and 15 dollars later and she's running great.

[@douglasphillips24]

Thanks for this information . Got a rebuilt 305 that still ran at 265000 miles. I've replaced about everything on my 88 gmc 1500 & now it runs rich especially after warming up . Thanks a lot. I was thinking about a new TBI but at $765 I'm definitely rebuilding mine now.

[@deanweidling7715]

Great Vid. This fellow covers a lot in reasonable time, unlike some that talk so slow. I did not know about the temp sensor in the front, only the one on the side which operates the gauge. That was my problem also. Thanks.

[@bubblehead126]

Best video explaining the issue i am having with my 350. Tbi rebuilt and new fuel pump. Fuel pump did die. Running rich so im doing these next steps. Thanks again

[@stevepraetzel7748]

Thanks for the great video. my 96 K1500 was running super rich, blowing black smoke, hesitating and sluggish on acceleration ( throwing NO Codes) . I followed your instructions and replaced spark plugs, wires, rotor , MAP sensor. Bought the Engine Temp control sensor and the TBI rebuild kit. Sure enough, the Temp control sensor was the issue and changed everything. I'll save the rebuild kit for the future. Thanks!

[@t.3822]

this guy is pretty good, the engine temp sensor was my problem, it had me about to buy a fuel pump, and a bunch more i didnt need....Thanks so much

[@stevekinkle5632]

Thank you so much for your video. Mine was running rich and by watching your video I was able to fix my problem which was the temperature sensor.

[@mhyatt82262]

Cody - This is one of the BEST videos for troubleshooting a 5.7L TB. I can't find a flaw in anything you stated. You nailed it!!!

[@CodytheCarGuy]

+Mart Hyatt Thanks im actually going to be doing s new one on the tbi in hd very soon!

[@notavailible1480]

Hey thanks for the video been fighting this thing for a week straight changed every thing I thought would create the flooding then watched your video and change the temp senser runs like a charm.Was a awsome help cheers :)

[@paulie615]

Great vid, Cody! Thanks for taking the time to post. I’m about to look at a 92 Chevy 1500 with a V6, and your video is helpful as I research the make and model.

[@JHartColorado]

Thank god for this procedure process you wen through! Picking up an 88 rcsb with the 305 tbi with a skip at idle, and 1/4 throttle, but clears up at 1/2 and full throttle in the next couple days and this will give me an excellent start on what to do! I really appreciate this!

[@brianivory752]

1994 tbi 5.7 chevy 2500 4x4...running rich..I did the oxygen sensor, better running...then plugs cap and rotor and wires, better running...and then found this video...then engine control temp sensor..better runner.., and the last key was the MAP sensor and now it runs like a watch..thanks Cody

[@jayro4113]

Finally!! Someone that knows fricken TBIs 🙌

[@bigb5433]

Awesome troubleshoot video bro. Very detailed to the point and no special equipment needed for diagnostics. Im a backyard mechanic myself and learned a few things i did not even think to check. Thanks for the video and hope too seeing more from you. Cheers. from fellow dyi personal vehicle mechanic from rainy portland oregon. \m/

[@roberttempest7543]

Hahaha Rosenberg Oregon here

[@jimbark4642]

I remember my first beer. hope your still staying curious and turning wrenches up there in weird vill

[@tonypighetti6221]

dude I was pulling my hair out trying to figure out why my truck started running like crap and then not even starting when it was hot. watched your video and checked on your tip for the engine temp control sensor. BOOM! wire connection all brittle and barely hanging on. replaced it and truck is truck running like new! Thank you Cody you saved me precious time , aggravation and a boat load of money!!! as fuel pump, etc etc were going to be next. Thank you again Cody!

[@ryannihart2815]

Was it misfiring most of the time but randomly run fine ?

[@awakened1169]

You made my day. My MAP was bad and your vid was dead on. Good job Sir Cody! 👍

[@3cool2beans15]

my temp sensor plug in had corrosion on one side and after changing the regulator and injectors, IAC, and TPS it still didn't run correctly until I found that wire and cleaned it up and now the motor runs sweet and it doesn't miss anyone. just a suggestion bc I had a heck of a time and this dude has a good video full of info.

[@themodernadventurer4320]

Just bought 93 and could use some of this. Thanks for the great video.

[@Nocluespops1]

That temp sensor is the key to many of that years problem on cold starts to bad run after it warms up. First thing you change if temp Gage has been acting up, it messes with the engine control system. I think you hit the nail on the head on this one. It never hurts to check the T B I anyway.

[@mariocannizzaro9807]

I wanted to thank you for advice on the changing out of the temp sensor.. I have a 91 GMC Sonoma 4.3 running rich and crappy! Runs like a top now! Saved me $$. Thanks man

[@anthonyskorner4511]

To give you credit, good point on checking the plugs. They don't lie.

[@DIYDaveT]

You can either just shotgun the fix or you can get the proper equipment to see what is going on. These GM TBI systems have parameters that can be read back by computers that plug into the diagnostics connector. These tools come in a range of functions. Some of them just allow you to read the OBD codes and the SES (Service Engine Soon) LED (AKA the idiot light). Others allow you to read all the parameters, including the value of the CTS. Still others (at higher prices) allow you to tune the parameters in the ECM. IF you are reading these comments that tool is probably more than you want. But for everyone else that wants to work on GM TBI, get two things: 1) a fuel pressure gauge to screw into the Schrader value on the fuel line (you might have to make a mod to add the schrader, my Crusader 454s have it as stock equipment...) and 2) a diag port reader. In the case of my twin Crusaders I use the Fox Marine MEFI1 to NMEA 2000 gateway but this is too expensive for automotive use. But it is an example of a small computer that you plug into the diags port of the ECM and it displays everything from MAP sensor reading to Throttle Position Sensor value to CTS value, etc. It gives you these values both in volts and in meaningful terms. For example, CTS tells you degrees F. MAP tells you how many ATM or BAR (as well as atmospheric pressure when the engine is not running). It also gives you the RPM, the spark advance, the injector on time in milliseconds and the fuel flow rate. So with one tool you can really see what is going on from the ECM's viewpoint instead of just swapping out parts until it seems to be running better.

[@juanrobertoruiz1309]

Great video, had already changed the iac, distriburator cap, rotor, spark plugs, and wires and nothing. Changed this temp sensor and problem solved..

[@blakenewton2781]

Had a Coolant temperature sensor go bad on a Holley Sniper /440 setup. After listening to this I thought to replace it on my plow truck ( K2500/ 5.7). Worked great

[@normanstites891]

Thank you for this information. My 1995 5.7 just started to back fire through the air cleaner. I was checking under the hood and found the vacuum tube for the egr was off, put that back on and still did the backfire. I will try the temperature control, as that was brought up by some. Great information. Thank You

[@505isiot]

Thank you so much man, picked up a 93 Silverado with a 350 for 400 bucks. Got it to run but idles horribly. The tip on finding vacuum leaks is great! Thanks again!!

[@user-zr5zl8zd4c]

Idle air control valve mine was doing the same thing til I swapped it out! It was covered in carbon deposits and stuck on open position

[@christopherjude]

Thanks - You the MAN! I have a 95 GMC with a 454, 244,000 miles. Usually runs great started it up and was running ruff blowing black smoke when I hit the gas, It was dumping crazy amounts of fuel from the injectors. Thought it was a miss, changed plugs, they were black, didn't solve the issue. Found you video. . . changed the temp switch and runs wonderful. I would of never thought to change that switch, and I've been a backyard mechanic for 35 years. In all honestly, you have made my life a tiny bit better. Thank you for taking the time to post this video. Good job, no GREAT job. Now all I have to do is deal with a seeping heater hose with that silly connector on the manifold.

[@missingremote4388]

+Christopher Vaccaro / I have the same GMC. Also, probably need to chame my teperature switch too. She always idles fast. In nutural stays at or, above 1000 Rpm instead of 750. Smokes some; But white smoke never black. Tail pipe is pretty clean = no oil burning. I have a couple youtube videos of start-up and idleing. Grazie

[@juanlamas1601]

hi pig h tunks

[@meansofexistence2157]

black smoke might indicate carbon build up and a bad fuel regulator

[@carlosherrera8541]

Yeah I did that to mines and still runs rich and black cloud of smoke when I floor it. I'm thinking I got a different issue. Maybe regulator not sure yet

[@johnbrown-bi5cz]

Well I Did listen to your video. But the first times didn't listen because I knew better. So after changing the fuel regulator, the injectors, the iac, the tbi, the plugs the fuel pump and the distributor. I came back listened to your video and instead of ignoring the cts I unplugged it ran crappy but ran. put a new one in and it runs perfect. thanks for the video I would of save 1k in parts if I had only listened to your video . Thank you John (thick head who knew better) lol

[@richardcournoyer1473]

93 astro spent 200 on all kinds of parts and stumbled on your video and it was the mapp sensor ! spewing blak smoke out the pipe and thanks im going to check your tbi rebuild vid my injectors are weak in one side

[@jimmyrodriguez6568]

thanks for your input it did help with my pickup truck i replace everything you show n my truck is running great again...thanks!

[@martinbaca9783]

Before you put in the new pickup coil was it running rich ?

[@vikingmike8139]

When Cody is referring to 'badminton' he is making reference to the cone shape or conical pattern of the fuel spay off of the fuel injector. Great video with all the common sense places to look for signs of fuel problems. Cheers Cody !

[@kellyd887]

Cody.. the word you were searching for is birdie... " Badminton birdie "

[@TheIbookguy31]

@@kellyd887 It's called a shuttlecock.

[@juanvillegas5718]

thanks a mill.that just solved my 91'S problem.

[@L19R]

I have a 91 k5 blazer and change plugs and wires made it start better but once warm it flooded itself out. Change the engine temperature sensor runs like a champ. Thanks. Rebuilt engine and transmission. 250k miles

[@jimmyers8114]

today at my old Missouri shop i worked on a 93 5.7 tbi with a complaint of running rich on cold start and hot start also, would mysteriously smooth out when put into reverse or forward and would drive fine down the road. investigating found a mouse nibbled vacuum line just behind the t.b. next to the rubber fitting. had to fix another vacuum line as well. I test these lines simply by unplugging each end and blocking one end with my finger and blowing into the other end. May be a little crude but it works. also the IAT connector under the air cleaner was shorting out at the plug, wire covering was bad where the wires went into the plug. Fixed this with JB weld to keep the wires in place and isolate them from each other. i did replace the cap & rotor, owner had replaced plugs and wires. Runs like a champ now. Check all plastic lines and rubber ends, they deteriorate over time. hope this helps if someone has a similar problem.

[@gsbrady3yahoo]

Great video Cody! I wish I'd found this before spending so much money swapping all the parts. It turned out to be the MAP sensor on my 4.3. Thanks.

[@shadowopsairman1583]

The map on the 350 here caused it to not rev high

[@JoseJuarez-sz6xv]

I saw your video's and they are helpful. I followed each step and my 305 runs good again

[@jeremylaxton8639]

Thanks for the video. It was a good one. Changing those parts on my 89 right away

[@drivechevys2673]

One thing I always recommend when buying an older vehicle, is to replace all the sensors and valves lots of people only do basic service spark plugs cap and rotor and fuel filter. but things like carbon canister, EGR valve, throttle position sensor, idle air control valve, fuel regulator are things I automatically change out not everyone puts thought to these extremely important components. Think about it people, oh and before I forget PCV valves can make a big difference as well

[@brickwall911]

Quadruple the price of $100 truck. At that rate I may even get lock for the ignition

[@janinereyes7120]

I think you know to much about this so I need some help why my truck the tbi smells like gas I rebuild the engine what pretty much everything is new accept all that that you name

[@edgrrickett140]

Hello I've rebuilt my TBI and changed throttle position and idle air control and now I'm gonna change out my coolant temp censor just cause! Thanks for this tip Cody!

[@sfm432]

Edgr Rickett I changed the Electronic Coolant Temp Sensor located on Intake Manifold by Thermostat Housing and it instantly cleared up my issues. This has been going on for over a decade! Engine starts and idles great! Simple $10 part and 5 minute fix. Thank your for video and comments!

[@clintutter7798]

Great info..it was my ETCS like he said when everyone else said change pump

[@mumblesnorris6650]

Thk you for this info, I changed both sensors and it runs like a champ again

[@spsjason2]

Thanks for your video and help. I solved my problem, Finally! Mine was a bad pick-up coil as soon as I changed that out bam! it runs great! Thanks again.

[@craigkeller]

Great video! Two points though. Use much less anti seize on your plugs. Just a very thin film. #2. Use spray bottle of water to find vacuum leak. Engine will run bad on water and no ether vapors floating around to blow your face off. That’s it.

[@norain31]

Excellent right to the point didnt have to learn your kids birthdays or watch your niebours tallent show . good job cody .thanks for not wasting time . explained perfect !!

[@jameslamb5885]

Thanks Cody, you have great skills man! Great at visualizing what is going on for problem shooting!!

[@CodytheCarGuy]

well if it stopped after you were messing with those two then id say your on the right path, if your using a couple old parts one might be bad as well but usually a iac you can unplug its a pretty loud sucking noise like a major vacuum , a dropping of idle can also be a simple vacuum leak too or too much fuel on a tbi

[@CodytheCarGuy]

awesome you got it fixed , i had a how to test your injectors video for the chevy tbi

[@Ashley-cd7sy]

Video was informative however didn't fix my problem it's driving me crazy I can't figure out the issue

[@blairjosephbernard2011]

@@Ashley-cd7sy is ur truck struggle at idling like making a hunting sound to the point it almost wants stall out but doesn’t if so. Hears an ol school mechanic trick for you. Get a small hammer and a small point punch ok what you do with that is take your vacuum line off your egr and put the punch in the egr port and punch the hole out lil bit and put line back on and start it up if it’s still struggling and hunting still do that trick again a few times till it idles normal again that’s what I did to my truck works everytime for me to be honest

[@Ashley-cd7sy]

@@blairjosephbernard2011 idling is fine I have done a crap load of work the only problem I can't figure out is when driving it stops accelerating and you have to let off the gas and it picks back up every now and then the service engine light followed by the battery and a stall out happens but just turn the key and she's back running and that leads me to believe it's something to do with fuel system or vacuum line

[@mr7hunnid]

Great job on the video, it was very informative. Im headed to autozone right now because I have the same problem with the 350 in my K5. It was running fine yesterday but this morning it started running rich.

[@sethl4759]

Thank you this fixed the running rich problem on my 454 love the videos man👍

[@CodytheCarGuy]

nice you got it figured out , i might have to add a new part to the videos to cover that part, now you have a perfect running tbi system. Glad the videos helped that's why i make them

[@daltonshaffer1598]

So I changed my engine temp sensor mass air throttle passion but for some reason when its cold outside it likes runs away may Idle at 1500 1800 2k 3k one time it idle at 5k do you have an idea what that could be

[@slamdvw]

And a reminder: even if the temp gauge reads correctly means nothing. It is on a different sensor, usually in drivers side head.

[@virianbouze6854]

You do a very good job explaining, It sure helped me!

[@BugzBunnywazaHare]

Hay Cody, 87' GMC S15 2.8l 2-wheel. 2 yrs ago, I replaced my entire water pump system, heater hoses too along with my temp sensor. Trk ran great. 1 1/2 yrs ago, replaced the map sensor. Trk ran great. Last July 2020, check engine light on. Scanner reads; map sensor again. So I replaced it again. It lasted for about cpl of months. Check engine light on again. #3 replaced map sensor again. Now: cold start-trk runs great. Idles down to 700-800 rpms. Then after trk is at normal running temp, I go to start it, after I start it again, Check engine light comes on again. It sputters, idles rough, usually stalls. After I start it again, and get it to idle, the check engine light will go off and trk runs ok but idles a bit higher; maybe 900-1000. Tps has been changed last time I replaced the map sensor. Now I get check engine light flashes that says: TPS-low voltage. Do you think the temp sensor is bad because after it reaches normal operating temp and I start it, the check engine light will come on again!!!!!!!! It's hard for me to get around anymore because I'm disabled and bending over my trk, is hard for me. 216,000 miles on it. Just turned 216........ no vacuum leaks because at cold start-trk runs great. Let me know your thoughts. I may have an injector on right bank that will need to be replaced.

[@CodytheCarGuy]

You missed the whole point of the video, NO I DONT REPLACE each part until i find the problem!! I only did this video to show what ea part is and how it works and what it does. A video of me changing a simple cts wouldnt explain or show much. I have helped a ton of people solve their chevy tbi issues. These are only here to help as a guide. And im about to redo the video in HD with even more detail for the TBI system

[@famcomp73]

thanks good video my chevy was sputtering in 3rd gear. after watching your video and reading similar problems pulled the idle control valve sprayed the gump off with carb cleaner reset the other sensor and took it for a spin problem solved problem staying solved. thanks again good video. ps i was done in 10 minutes tops glad a saved a few hundred dllrs and did it my self.

[@davoid2006]

what "other sensor" did you "reset" Tom?... I installed a new IAC valve myself... worked great for two days now Im back to an intermittent issue about every 3 key turns... Im thinking ECM now or distributor module?... only things I have NOt replaced. I will EGR as well... need to "test" it. thanks for the post please reply to my question.. thanks again. - DTM

[@famcomp73]

Daniel Johnson i should have followed up mine was the same i had the fuel pump repaleced about a year ago after letting the truck sit s a few years to give you some history. my problem came back as well and thought maybe the temp sensor due to it only acting up low power when it was warmed up and reading other posts. went to go start the other day and wouldnt even start decided to to inspect the fuel pump had some time removed the bed and found the pump never got replace due to the lines being really corroded so iam going to start there this weekend it seems they fixed a ground wire and charged me for the pump aittle ticked. a friend said they might have replaced some internal parts and may have been the cause if a line was cracked or not installed right.my water pump and temp sensor was replaced at 80 thousand miles due to the motors to have known issues with the pumps andis why i didnt go for it yet. also where i live now i get alot of moisture under the vehicle and poped the hood when didnt start and found condinsation all over the motor and think it might be a wire issue but will update after the fuel pump due to not getting fuel right now.

[@davoid2006]

Tom I just got done doing all that to my truck... new bed, new fuel lines, pump, and all... still have the issue... please update after the weekend... thanks ... - DTM

[@famcomp73]

found it my fuel tank and pump got here installed it still no start went back to youtube and found a help full video my start relay was bad and oil pressure sensor. oil pressure is a back up to the fuel pump if the fuel pump goes out while driving its suppose to supply the fuelpump with power given theres oil pressure. durning the down time inspected the rotor cap all the pins were coroded in side so got a new one and new rotor button as well. it seems tobe running smother but still need to put the bed on and take it for a drive. illl find the video this guy has really easy trouble shooting.

[@famcomp73]

Daniel Johnson just got back from test drive she is running great just knowing the fuel problem is fixed the only other thing i did was replaced the distributor cap and rotor they were beyond bad with all the white corrosion build up in side the cap. going for the wires and plugs next iam sure they need replaced pops said he replaced them when the truck had 80k its at 140k right now. also a simple check if your loosing spark pop the hood at night and start it up if your wires are arking abviously were not getting the spark to the plug fyi.

[@feltongailey8987]

Had many TPS go bad over the years. Not uncommon at all (especially if they get wet). Good video. Thanks.

[@michaeldavis8452]

Man just Ed pulled the 4.3 out and put my buddies 5.0, got new plugs they all looked fairly decent but everything else you mentioned was point on the direction I was headed to look at next

[@breakerbroke23]

Great video.. Thanks

[@gregt881]

Thanks for the help, I just replaced the cts (by thermostat on manifold) and map sensor. Still rich. There is also a sensor in the air cleaner assembly which AUTOZONE refers to as air charge temp sensor. I think i'll try the O2 sensor next since effects fuel/air mix. OBD1 codes on car are 23 and 33. Car runs smooth when started from cold, but then starts chugging at idle within minute.

[@juanrobertoruiz1309]

Did you get the problem solved?

[@HellzYa29]

Don't you love it when nobody replies? Been reading this comment thread for a while and there's no follow ups or answers to anyone. Lame

[@SIDETRK505]

great video, very informative, ive been racking my brain on our 94 chevy c1500 5.7... Thankyou for sharing!!!

[@fee8255]

Adam Chavez Same here, this vid helped me fix it.

[@NotMyNameEither]

Thanks for the tip about the temp sensor. That was the problem. The temp sensor was the only code that I got on my 1995 Chevy K1500, 5.7 and I ignored it because I didn't think that would cause the surging idle or bogging down and dying from too much gas. I also had a bad exhaust leak and thought that was causing my O2 sensor to flood my engine so I fixed those first. Well it's running good again after changing the temp sensor and I no longer have an exhaust leak. lol BTW the temp sensors have 2 different pin configurations so double check what you have.

[@kellyd887]

The 2 different pin config are so you don't mix up the coolant temp sensor ( near thermostat housing ) and the engine temp sending unit which screws into the cylinder head between the #1&#3 spark plugs. This sends a signal to the temp gauge in the instrument cluster.

[@robertshafer6168]

Ok I'm seeing there are 3 ect sensors 213-77,213-928 and 1551107

[@Bob-pu7ps]

i put in all new TBI --our just stall out blue

[@johnnybrewer4999]

Haha clogged fuel filters and bad spark plugs can make it run rich! But seriously bad coolant temp sensor can be a problem, it was on mine

[@KeithGreenshields]

Thanks for your video...very informative, of the best type I have seen on KZbin for tutorials. Thanks

[@mac00gt]

Shuttlecock... lol That's the little Badminton thingy you were talking about. ;) Now you'll never forget it. Great video btw. Tyvm sir.

[@raymondpanek9483]

Great vid! Love OBD1 GM smart people...we are rare! One bit of critique...GUYS PLEASE DONT USE BOSCH, E3, AUTOLITE...ECT... if you're a hill rod and love your delcos I cant help you but wouldn't it be great if there were one brand of plugs that rans THE BEST IN ALL VEHICLES!?! ...guess what there is! Everyone made in Japan! NGK PLUGS and NTK O2 sensors! These things are amazing, oh and just the v power nickels are just fine...your $16 O2 sensor and copper/nickel standard plugs...both are 30k miles of lifespan iridium's are good but you should put an accel or msd coils...I've run both, never noticed a difference really do you like red and black or yellow and black lol they can jump the gap. Awesome tip these damn sensors...different than the sender that has a 1 pin on the driver side...basically if you have no codes, the sender is a big thing, small price! Always check the 3 ground straps two go below the heater core inlet on the firewall one to the engine in a shitty spot on the block the other is just frame to body, there is a third strap, it's not really for any kind of management as it doesnt go to the circuit of any powered eqipt...its for safety! Look under the driver side blazer Burban Tahoe c/k pickup it runs from the fuel tank hose assembly to the frame...without it one spark and fire in the hole! Check them all. And as our video host said...map replaced...a little bit better...this shit is 25 years old give or take guys wires connectors and sensors...all the hot cold humid dry and time...my TPS was smooth on the meter, perfect spec...did replacing it and the in spec IACV help big time...YOU BETCHA! These parts are so available and so incredibly cheap...just find your main issue and get to them as time allows! Oh, and since you read this far I'll let in a tip for ya'll, if you have a bad MAP. MAF (NOT ON THESE BUT IN GENERAL) BAD TPS, IAC VALVE, O2...if you have no tech1a scan tool and the jumper wire says 12...no codes...unplugging these engine management sensors one at a time, when the bulb comes on qnd you go theres that little ****er! Gotcha...there ya go. Itll pop the service engine light and throws that sensors job to open loop runs it off generic engine mapping in the ecm just make sure the connectors dont short to metal, and when the condition dramatically improves...there you have your issue! it's as valuable as it is cool and simple! Hope I've helped people and if you have any OBD1 questions from twin thi 84 c4 vettes to 95 trucks to 2.5 fieros and 3rd gens to g body's...PM me I'll be glad to try and help ya! Thanks, - 350ChevyDude

[@stevemccull9699]

I wish I could figure out the PM method

[@papimiami1938]

Damn bro , you just taught a clinic with this post ! Huge help just found a CLEAN 1992 Chev c2500 basic truck . Has the idle stumble and is Rich . You gave me all the pointers I was looking for

[@cmp1236]

Pm you where?

[@GrampatheGamer]

thank you very much, very hard to find any info on these older efi systems.

[@edwardbessent9352]

Thank you so much for your video you the only one on KZbin what exact same motor that's in my RV and my RV's doing the same thing running rich

[@neshobanakni]

I've gone through two cat converters on my '96 and need a third. I believe the tbi is running rich and detonating in the cat converter, reducing the innards to scrap.

[@DivinebyNature_]

I Love obd1's easy fix. Everything's right in front of your face ! I'm a GM girl ! Not the new overseas gm but the American Built General Motors with Fisher Bodies. Delco Remy (:

[@brandonscott9302]

May have already been pointed out, but I believe the part you keep calling the MAP sensor is actually the IAC, idle air control valve. Fuel filters won't cause a rich condition, they can cause a lean one though. You mentioned running lean would creat a very clean plug, but it would actually be ashy, kinda white. A really clean plug usually indicates water leaking into the cylinder, as it heats up it vaporizes and steam cleans everything. The plug you pulled almost looked oily, which can also make an engine seem to run rich. Especially if it has been doing so for a while and trashed the converter. You mentioned putting in a cooler thermostat, but that will actually hurt fuel efficiency. The bigger the temp difference between the fuel/air mix and the heat of the burn the more power you'll get. Stick with OEM temp and you'll be fine. If its running rich, it's either getting too much fuel, or it's simply not burning it. Make sure your plugs are in good condition. I noticed yours were platinum, and seemed wore down. Check the cap and rotor if equipped, not enough spark=less burn.

[@GODZILLAMANASS]

He is pointing at the map sensor. He even had an extra map sensor in his hand. The idle air control valve is built in to the throttle body. Congratulations on making an ass out of yourself.

[@PM-dk2wx]

justin cotter Like they say, everyone that's got an ass is one at one point or another; just happened to be Brandon's turn here, and, we all take turns.

[@GODZILLAMANASS]

Paola Medicci couldn't agree more

[@GeboNC]

Paola Medicci lmfao

[@chris6200]

Brandon Scott The black sensor on the small passenger side bracket is the map sensor. He is labeling it correctly. What it does is tell the computer the pressure/vacuum in the manifold so it can adjust the how much fuel to deliver. The IAC valve is actually not a sensor at all. It is screwed into the passenger side of the TBI unit. the IACs function is the adjust the amount of air coming into the manifold at idle. Symptoms of a bad IAC would include bad idle, high/low idle, or lack of idle but with the throttle opened the engine runs mostly normal.

[@cattreesteve]

Thank you so much, your video was very good I will try this process this week you have helped so much

[@mbertolet]

Thank u for this video it fixed my truck come to find out it was the map sensor and the engine coolent sensor

[@bigjack2100]

Hi, thank you so much for your amazing tutorial and detailed explanations! I have a question to ask you... I currently have an issue with my 5.0L TBI, the fuel injection occasionally misfires (or at least I'm pretty sure it's that). This causes the engine to stall, or the RPM to be reduced when I'm driving. What do you think could cause it? Thank you again.

[@derrickschweertman6231]

Did u find the answer as this is exactly what I’m going through with my 5.7

[@marcusbortz2358]

Meto I gotta 89 5.7l silverado

[@DIYDaveT]

What you meant to say was CTS - Coolant Temperature Sensor. For others here, the ECM's CTS is completely different than the temperature sensor for old school analog gauges. The ECM CTS has 2 wires and is fed 5 VDC from the ECM. The sensor resistance creates a voltage divider with a known, fixed resistance in the ECM. Varying temperature changes the resistance of this sensor and the ECM uses an ADC (Analog to Digital Converter) to turn the voltage read back from the voltage divider into a temperature, i.e 170 deg F. Conversely, the analog gauge sender is essentially a variable resistance to ground. So, you feed the gauge 12 VDC and that goes through the coil that moves the gauge's dial. The output side of the gauge's dial actuator coil goes to the un-grounded side of the sender. As the temperature changes so does the resistance between the electrical connection point of the sender and engine block ground. This changes the amount of current that flows to ground through the gauge's needle actuator coil. When current flows through that actuatur coil it creates a magnetic field. This electromagnet is in close physical proximity to a permanent magnet. When current flows through the actuator electromagnet, it pushes that magnet which is connected to the gauge's needle, thus changing the reading.

[@cjones582191]

Its called ECT “engine coolant temp”

[@jnotah]

The ecm uses a "sensor" , the guage uses a "sender"

[@randywl8925]

The info is wonderful and explained very well. "a little bit of anti size" looks about 5x too much IMHO. It hardly needs any to do it's job on plugs. I but a tiny fan on the threads, then brush it thin around the rest of the threads with an old toothbrush. Once again, great info on the procedure sequence. 👍

[@bookerT_502]

Thanks Cody, changed coolant temp sensor, 95 Chevy z71 5.7 runs like a new car! No rich, no more misfiring, no bogging.

[@LasergirlYT]

Thanks Cody! I just bought a 1988 GMC Suburban. I love it! When I come to a stoplight and I'm sitting it seems to idle just a tiny tiny bit rough. My mom said I need a tuneup. I'm a female that knows not a whole lot about cars....... any suggestions? Also...what type of K&N Intake should I put on this girl? She's a beautiful stock 350 Sierra Classic. I even have the OG running boards!!!!.....Lovin this truck! Straight old school.....lol.

[@CodytheCarGuy]

You mom just might be right a tune up can go a long ways. Some times a cap or rotor or old plugs, plug wires will seem fine driving but sitting still they can make it idle a little ruff. Nothing wrong with old school i have both old school rides and newer ones.

[@meansofexistence2157]

just the cone to replace the box. rest is market scam

[@tonythetuner9763]

It's a DUAL Plane intake..... The right hole feed's the left side! 😂😂😂

[@robbiefrentz9427]

Tony TheTuner No they run the two inner and the two outer ones on opposite side. How about your purge valves I’ve replaced countless numbers of them. Also the tbi will also clog the port to map sensor. Will cause it to run rich. Also early electric fuel pumps had a orange hose coming out of fuel pump. They collapse or split. Car runs extremely rich.... because it actually runs lean. And computer actually over corrects. Easy way to check for that is unplug the map sensor. If it starts running better. Then check fuel pressure and volume

[@kenakre5044]

thanks for info...I'm working on mine and your helping me with it thanks again

[@user-lo5rx2ts9f]

I have to say that if I would have watched this video, it would have saved me aggravation and lots of money. You were dead on with the problem, thanks...

[@lilcs3011]

hey thanks man my truck was idling high i replaced the engine temp control sensor bam done.

[@iszack1000]

Thanks you know your stuff!! I changed out the temp control sensor and it work!!!!!! Thanks I will save this video for further. Thanks again!!!

[@briandaniels5596]

Have a 1994 Chevy Silverado it's got a 350 four bolt in it I'm looking to put this little screen or little tiny screen in it in the throttle body I don't know where it's located anybody help me

[@randytaylor2651]

Thanks alot there guy, your vids r not only educational, but also interesting TY

[@mrwashur1991]

@@briandaniels5596 probably the injectors...

[@TheJohnnyfleming]

Wouldn't you see the temp gage reading too low on the dash too?? Or is the gage sensor different??

[@davoid2006]

yes different.

[@km6344]

your temp gauge or light switch on a tbi engine is usually around you 1 an 3 spark plug area typically a one wire plug! the sensor in this video only sends data to your ecm

[@americanwolfke5sqb916]

All right Great go to place i looked everywhere for this kind of advise

[@PatrickBaptist]

Hey thanks for this video, I just bought a RV with a junk 454 that has no power and I don't have any wrench experience on these thanks for the info I appreciate it.

[@robertpaulis439]

Change ALL the plugs and wires and properly time it. If that don't do it put a new distributor in it. Good luck

[@2bignugly]

Great video, very ADHD friendly

[@jessebenjamin4779]

I have replaced my MAP, temp sensor but I still have a stutter and feels sluggish when accelerating. Somedays it will run smoothly like when the weather is cooler in the morning.

[@gregorymalchuk272]

Have you checked the oxygen sensor? Have you been able to pull any of the trouble codes?

[@WildBill710]

Throtle position sensor

[@mulabate]

Good demo rumrunner439 on the fuel flow or injectors not operating properly on GM TBI's. I got a 94 Astro TBI vortec Z. Have known the injectors were not spraying right, so i replaced a bunch of the electronic components that intereact with the computer signal to the injectors,pulled the tank, check the lines installed new pump. I'm down to my last 2 things on the fuel system "Fuel pressure regulator" just ordered online $30.24 usps delivered. If that don't solve it then 2 new injectors next.