1988-1998 Chevy OBS LS Swap Drive By Wire (DBW) modifications

Part 18: The 1991 Project Shop Truck is getting closer to the 5.3 swap. The 5.3 I'm using is a DBW motor. This requires a little bit more work to install than a DBC motor. This is how I installed the TAC module and modified the gas pedal to work with the swap.
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Several key takeaways:
1) Not difficult, but does require some creativity to mount the pedal and TAC module. Your swap may be easier to do.
2) Be sure your new pedal position allows for full travel of the throttle without touching the floor.
New item used in this video with links:
Some scrap metal and various nuts/bolts and grommet I already had laying around.
Total for this episode: $0
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Running total of $$ for project Shop Truck:
Part 1 Truck total price $1,308.00
Part 2 and 3 (control arms) $230.76
Part 4 Front brake/spindle rebuild $196.93
Part 5 Cost of Donor + parts sold $265.00
Part 6 Engine parts $438.93
Part 7 oil pan issues $45.04
Part 8 oil diverter $27.01
Part 9 Truck bed removal $00.00
Part 10 Rear suspension lowering/rebuild $226.84
Part 11 LS fuel pump/hose upgrade $99.99
Part 12 Rear disk brake conversion $544.16
Part 13 Pulling engine/trans + clutch/flywheel $316.47
Part 14 Steering shaft upgrade -$17.64
Part 15 Front suspension removal + LS motor mounts $113.99
Part 16 New front suspension/steering install parts $359.02
Part 17 OBS to NBS master cylinder upgrade $99.97
Part 18 DBW modifications $0
TOTAL PROJECT $4676.88
Disclaimer: This video is intended for entertainment use only, if in doubt as to your mechanical ability, consult a professional to perform the needed work.
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[@ronw5476]

I don't comment on videos often, but this was extremely helpful. Great video! I'm currently working to install the DBW pedal in my LS swapped 1967 Firebird. Thanks, and keep these videos coming!

[@laurencevillegarage]

@@ronw5476 thank you, and good luck w your Firebird!

[@kyleblume6530]

Although this may not help you now. But a 6.5 OBS pedal will bolt in directly to the OBS gas pedal spot. Swap pin a and f on the plug at the pedal, trim a small notch in the plug. And the 6.5 pedal will bolt right up and plug right in.

[@kyleblume6530]

Which this of course will make the pedal height perfect as it’s just a factory OBS pedal.

[@speedfreakz5288]

@@kyleblume6530 I have a 1996 OBS with a 6.5 diesel I swapped a 6.0 Ls into it.. Are you saying to swap pin A and F on the white connector that goes into the pedal?

[@kyleblume6530]

@@speedfreakz5288 using the wire that goes from the ls tac module to the ls factory pedal, swap pin a and pin e (i originally said the wrong pin) on the pedal side. And it will work just fine

[@michiganpowerwashingpros]

@@kyleblume6530 just to confirm this is for the connector that would be going into the original pedal but now going to the 6.5 pedal and the pin swapping would be making it communicate properly?

[@wacofives5094]

GREAT EASY TO FOLLOW LESSON. I WILL FOLLOW YOUR LEAD ON MY SWAP...

[@laurencevillegarage]

Glad it was helpful!

[@davea5113]

Thanx for all the GREAT videos, straight forward to the point information that you can use. I am doing a LQ4 install into my 89 Chev shotbox fleetside and your info is priceless!

[@laurencevillegarage]

I'm glad you found the videos helpful, good luck with your project.

[@artrivas5739]

If you don't want to do a electronic pedal modification use the 1995-2000 6.5 turbo diesel truck those model uses electronic pedal and bolt into any gas OBS truck. The wiring color is the same but the connector from the pedal is different. Just cut and solder the wire. My swap works great.

[@laurencevillegarage]

Good to know for the future, thanks for sharing.

[@DizzKidz]

PSI makes a jumper harness too.

[@savage3960]

Thanks a lot I will be doing mine this weekend , unfortunately I will have to work around the engine.

[@laurencevillegarage]

It is doable, just a bit more work.

[@ag_trucks]

Nice video man, keep it up

[@gerardolopez5875]

On my 93 obs , i modified the same 04 pedal to use the nice square pedal

[@laurencevillegarage]

At first I was going to re-use the ‘01 pedal. Then I saw where someone working on a Malibu (I think) did it this way and it looked like less work and would keep the original pedal.

[@gerardolopez5875]

@@laurencevillegarage @ if u dnt mind, can i ask u whos doing ur pcm tunes?? I was doing it with a guy from houston, but he’s not available no more,,,

[@laurencevillegarage]

@@gerardolopez5875 For this swap, I am going to use Brendan at lt1swap.com. I am keeping the swap stock, so it should not be a big deal, just a few tweaks. It is going to run $75 and shipping. Since I have used his site so much for information, I feel its the least I can do to help him out.

[@gerardolopez5875]

@@laurencevillegarage @ agree, thats what i was thinking,, On my next project,, any idea how long would it take Pcm to return?? Iam located near uvalde tx

[@laurencevillegarage]

@@gerardolopez5875 Not sure, hoping less than a week. But, I'll be shipping mine out in the next week or so. I can tell you then!

[@LeandroJSilva-fj5fv]

Thank you, great video, lots of information. I'm working in a few projects of my own, one is a 56 Apache. If you don't mind I have a question regarding the drive-by-wire, will the pedal sensor, module and throttle body work on their own and if so how? Thanks

[@laurencevillegarage]

It all depends on the donor vehicle....depending on the vehicle, it will have either drive by wire (DBW) or a drive by cable (DBC) throttle body. PCM programing is specific to this arrangement. The parts of the system, connections and programming are specific to that. So, if you have a DBC throttle body, you could not just delete the cable and connect a DBW system. The throttle body will dictate the direction you go. In short, if the throttle body is DBC, stay with that system and if it is electronic (DBW), then stay with that system....wiring harness, pcm, all parts, etc. The Pedal sensor, module and throttle body cannot work all alone. Must have correct wiring harness and pcm. Keep it simple, you will have enough little things to keep track of and make work without over complicating it. Good luck!

[@obslife1985]

I just de-pinned my drive by wire harness ran the wires thru that cruise control hole and then re-pinned the wires to drive by wire plug super easy but i don’t think my wires where that long tho

[@laurencevillegarage]

I had not thought of that, good idea!! However, you have to be very careful to re-pin exactly or you'll have new problems. I like the idea.

[@brodenmcammond6671]

I swapped a 5.3 into my 91 k1500 with the original 5 speed (5LM60), I'm struggling to get my cruise control working. Did you get cruise working on your swap?

[@laurencevillegarage]

I still have a few projects left on the '91. That is one of them. With my truck having cc initially and the DBW having cc, it should not be too difficult...having said that, I have not done it yet. You can check out lt1swap.com, Brandon has a write up on cc that may help you for now. Thanks for asking.

[@Blobby_Hill]

why not remove the wires from the connector lol

[@laurencevillegarage]

If you are referring to the module wires, I left them on to show the interference with other components. If I had removed, I might have mounted it not taking into consideration the space the wiring plug takes.

[@jamesallen33]

What about tacking the nuts in place? Have you had issue with the longer pedal?

[@laurencevillegarage]

The project is not finished yet, currently working on the harness, so, it has not been driven yet. If you mean tacking the bolts in place on the bracket and inserting in the holes in the firewall, that's a good idea. If you meant something else, not sure what you mean. Thanks

[@ערןתומר]

why not zip tie the tac module somewhere under the dash?

[@laurencevillegarage]

You can do that. It can be mounted anywhere you want. In the current swap I am working on (the '07 Tacoma/L33 swap), I have the tac module inside the truck on top of the trans tunnel behind the console.

[@bryanmoring4298]

Could have welded the nuts to the firewall

[@laurencevillegarage]

Thanks for watching the video, yes, I could have. Maybe next time I'll do that or use rivnuts.

[@23steph13]

Can I run a Ly6 with gen 4 harness and 58x crank, 4x cam, gen 3 intake/throttle body/heads, 6l80 Transmission?

[@laurencevillegarage]

I don’t see why not. It looks like you have a gen 4 short block/harness, I assume gen 3 6.0 heads...should be fine.

[@23steph13]

Thanks

[@jaxjax5322]

You don’t need the cruise module if youre yousing drive by wire

[@laurencevillegarage]

That is correct. I mounted the TAC module in place of the "old" cruise control box.

[@tjlittle6785]

Have my 94 cranking and running but will not shut off my key

[@laurencevillegarage]

Is your harness new? or did you modify the harness yourself. A couple of areas off the top of my head...remove your "constant" and "key on" power wires used to power up your harness. Then double and triple check the source you use to provide power to these two sources. If it still occurs, retrace your wires at relay/fuse box to see if you put a key on power wire in a constant power source. Good luck, let me know how it goes!

[@tjlittle6785]

@@laurencevillegarage relay wires were crossed

[@23steph13]

What year suburban was it? Thanks

[@laurencevillegarage]

2002

[@23steph13]

Thanks

[@gerardolopez5875]

Do u prefer drive by cable? Or?

[@laurencevillegarage]

As far as drivability, I’m not sure yet. I can better answer that question when this one hits the road. For ease of installation, DBC.

[@gerardolopez5875]

I have done like 3 swaps, drive by wire, Never a drive by cable😩

[@laurencevillegarage]

When you do a cable, you’ll see what I mean. Much easier. I had considered converting this one to cable. But, I’m trying to keep this within budget (that isn’t going to happen anyway). I would have to get another throttle body and cable…just more $ to make it easier. When this one is complete, I’ll have a much better idea for future projects. I’m seriously considering carburetor on the next one. Not cheap, but save on harness and tuning costs.

[@gerardolopez5875]

@@laurencevillegarage @ i will try swap my 84 silverado, with a cable driven, next,

[@gerardolopez5875]

Do u have the 5.3 dbw grommet?

[@laurencevillegarage]

That grommet or plug I found in my garage parts stash of miscellaneous stuff. I have no idea where it came from. It looks like it might have come from the end of a door, near the latch…maybe a Ford?

[@jaxjax5322]

You just need the electric ls gas pedal

[@laurencevillegarage]

That is what that is. The pedal, wiring, engine, etc all came from the same donor.