88 built from 91 TBI
#1
88 built from 91 TBI
So I had a 91 camaro rs TBI that had a messed up body. I bought a roller, 88 Camaro rs. Stripped all the engine bay and put everything from the 91 on there. The car started right up with the 88 ecm. So I decided to annoy myself by installing the interior harness from the 91 on the 88. Connected everything just about right. Only things left unconnected were the air bag and the hatch release motor since they are not the same. I connected everything and connected the 91 ecm and the car won't start. The car wont crank and I don't even hear the fuel pump, which was working fine after installing the engine and transmission. I know its very complicated but does someone have an idea of what it might be? I've been working on this for 6 months and I'm dieing to drive my car.
#4
ScorpionKing395
I'm not sure... I don't have a chipped key and the 91 started just fine. I connected everything how it was and it won't start. But it did before without a chipped key
#6
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Re: 88 built from 91 TBI
does the check engine light work ? You can jumper the aldl connecter a to b to read codes.
http://www.obd-codes.com/faq/read-gm...codes-free.php
http://www.obd-codes.com/faq/read-gm...codes-free.php
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#8
ScorpionKing395
does the check engine light work ? You can jumper the aldl connecter a to b to read codes.
http://www.obd-codes.com/faq/read-gm...codes-free.php
http://www.obd-codes.com/faq/read-gm...codes-free.php
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Re: 88 built from 91 TBI
With the fuel pump not running and the engine not cranking, it isn't VATs. An '88 Camaro doesn't have the starter interrupt relay.
Check the fusible links at the starter. Power has been lost somewhere along the way. The bulkhead connector may have been pinned differently between the years.
RBob.
Check the fusible links at the starter. Power has been lost somewhere along the way. The bulkhead connector may have been pinned differently between the years.
RBob.
#14
ScorpionKing395
With the fuel pump not running and the engine not cranking, it isn't VATs. An '88 Camaro doesn't have the starter interrupt relay.
Check the fusible links at the starter. Power has been lost somewhere along the way. The bulkhead connector may have been pinned differently between the years.
RBob.
Check the fusible links at the starter. Power has been lost somewhere along the way. The bulkhead connector may have been pinned differently between the years.
RBob.
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Re: ScorpionKing395
As for the fuel pump and reverse, there is a wiring error someplace.
RBob.
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Re: ScorpionKing395
RBob.
#20
ScorpionKing395
No... When I use to drive the 91 camaro I used the same key without the pellet that I am trying to use right now. I switched the steering column as well.
#22
#24
ScorpionKing395
#25
ScorpionKing395
The car also seems to be getting 12v continuously. As soon as I connect the battery my parking lights turn on. And I have them turned off at the head light switch. I'm working on it right now trying to see which wire was connected wrong, or why am I getting power to those without the key being on.
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Re: 88 built from 91 TBI
The parking lights and the fuel pump oddities sound like there is a ground problem. Check all of the grounds in the engine compartment and under the dash.
RBob.
RBob.
#27
ScorpionKing395
So I tried to hot wire the starter and nothing. The starter works but the engine still doesn't seem to want to start. I heard it start so I know it works. I heard it start with the 88 interior wiring. I put the 91 wiring and steering column and nothing. I'm starting to think there are connectors that aren't compatible because of the year difference. The only thing that I didn't switch from the 91 is the gear switch. I'm going to search to see if that might be the problem. All the harness looks right about right. Nothing seems to be off. So fuel pumps on reverse and starter doesn't start the car. I tried it on neutral reverse and parking. Could it be the gear switch connector?
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Re: ScorpionKing395
RBob.
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Car: '90 Trans Am-12.45@110.71
Engine: 355 w/AFR 195's Elem. 400/430 HP/TQ
Transmission: Tremec T-56
Axle/Gears: 12 Bolt 3.73
Re: 88 built from 91 TBI
The '88 & '91 c100 connections don't match
If you have an '88 you have to use the '88 harness.
If you have an '89 you have to use the '89 harness.
'91' & '92 will interchange but that's all.
If you have an '88 you have to use the '88 harness.
If you have an '89 you have to use the '89 harness.
'91' & '92 will interchange but that's all.
#30
ScorpionKing395
Where does this harness connect to? Does it go out into the engine bay on the drivers side? Why would it not work if all the wiring is 91?
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Re: 88 built from 91 TBI
Yes on the left side in the engine compartment.
From year to year they changed the wiring on the dash side.
The connections therefore don't match.
From year to year they changed the wiring on the dash side.
The connections therefore don't match.
#32
ScorpionKing395
But all my wiring is 91. I installed all the wiring from the same 91 car on the 88 so I don't think that's the problem. I did however find a ground cable not grounded. I ran out of time but I will ground that cable and let you know if that was my problem. My fingers are crossed and again, thanks for your help.
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Car: '90 Trans Am-12.45@110.71
Engine: 355 w/AFR 195's Elem. 400/430 HP/TQ
Transmission: Tremec T-56
Axle/Gears: 12 Bolt 3.73
Re: 88 built from 91 TBI
You got me there, I wasn't aware you could put a '91 harness inside of a '88.
I guess keep searching for the missed connection.
I guess keep searching for the missed connection.
#34
ScorpionKing395
I tried to start the engine by turning the starter with cables and it works but the engine doesn't move. I'm hoping its not reaching the flywheel. And I no longer hear the fuel pump. 😬😬😬 I am officially annoyed.
#35
Re: ScorpionKing395
Fuel pump fuse popped? Any power to the fuel pump fuse? Fuel pump relay toast?
#36
ScorpionKing395
I'm fearing I may have triggered vats to work or a relay or fuse isn't working. I have power throughout the whole car except the cluster area, including the ignition switch. Where is the fuel pump relay located on a 91 305 TBI? And also, is there any relay or fusible link that feeds the cluster and steering column? I want to see this think out on the road already. Any help will be appreciated.
#38
ScorpionKing395
master cylinder? I have an automatic transmission. Where the hell is the master cylinder?
#39
ScorpionKing395
Also can someone tell me, or send me a link that will explain, how to completely bypass vats quick and easy? I will bypass it to scratch it out the list.
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Re: ScorpionKing395
Post 8
https://www.thirdgen.org/forums/tech...-no-start.html
You will need to bypass the starter enable relay as well.
You need to jumper or connect the two outer wires green and yellow or purple . The wires are the larger gauge ones. The relay is under the drivers side kick panel maybe under tar tape.
#41
ScorpionKing395
Brake master cylinder next to the lh fender on the bulkhead.
Post 8
https://www.thirdgen.org/forums/tech...-no-start.html
You will need to bypass the starter enable relay as well.
You need to jumper or connect the two outer wires green and yellow or purple . The wires are the larger gauge ones. The relay is under the drivers side kick panel maybe under tar tape.
Post 8
https://www.thirdgen.org/forums/tech...-no-start.html
You will need to bypass the starter enable relay as well.
You need to jumper or connect the two outer wires green and yellow or purple . The wires are the larger gauge ones. The relay is under the drivers side kick panel maybe under tar tape.
Wow thanks a lot!!! I'm going to check all these things right now!
#42
ScorpionKing395
Nothing I do works. I've been working on this car for ages now. So I'm still trying to get rid of vats but havent actually started the procedure. Did some reading and saw something about a prom. I still have the 88 ecm. Can I get the prom from there and put it in the 91 ecm?
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Re: 88 built from 91 TBI
Looks to be in the interior someplace. The general area of where it is located helps to narrow down what it is for.
RBob.
RBob.
#45
ScorpionKing395
Its around the fuse box. On the drivers side to the left of the steering column. That's the only connection that I never found. I'm hoping it helps me start it. Tomorrow I am going to go to a junk yard to see if I can find a camaro like it and look at the harness and take video. Hopefully I get some answers
#47
ScorpionKing395
I put in the prom from the 88 computer and nothing. The car doesn't seem to be getting any power. When I put the key in the ignition nothing turns on. Only the lights turn on when I connect the battery. What gives the ignition switch power?