Man I sure hope someone can help me!!!! I just completed a TBI to TPI conversion on my 1992 camaro and I can not get it to start!!! I used a TPI setup off of a 1989 Trans Am including the harness and computer. It turns over ok but it will not catch and run. First I'll list what does work then I'll list what does not work.

Does Work
1. fuel pump
2. starter
3. wipers
4. head lights
5. instrument lights
6. radio
7. spark plugs

Does Not Work
1. interior lights
2. power windows
3. power locks
4. hatch pull down
5. blower motor
6. engine

When I turn the key forward but before the starter kicks in, I know that the blower motor is supposed to come on but it does not. When I do try to start it, it turns over only afterIhear the relay kick on, before that I get nothing. It doesn't even chug like it wants to catch. I think the injectors aren't coming on, along with everything else! What the hell did I do wrong?! I also bled the air out of the fuel lines, thats how I know the fuel pump is working. I pulled one of the spark plugs and tried to start it and I do get a spark. I've checked the coil, it's ok.
The TPI setup was in pretty good shape when I got it. The only real problem with the harness was that the two orange relay power lines that go to the battery and are fusable were cut as were the A/C connectors. When I was removing the TBI harness I could not get to the grounds at the passenger side head so I cut them. When I went to install the TPI Harness I just spliced the passenger grounds into the grounds on the drivers side head. Another question I have is, are the fuse panel layouts different between the TBI systems and the TPI ones? Do I have to add fuses to get things to work?
I'm desperate as this is my only means of transportation. I'm missing work today because of it!!
Please, please, please, I begging, pleading, you for help or advise. If there is anyone in my area that has expereience with this and has some time to spare please get in touch with me by PM-ing me!

Many many thanks!
Will

 

The problem is the '89 harness and ECM. '89 cars are wired just a bit differently than '90-'92 cars. I recently did this same swap on my '90 Formula and was advised to be sure to get the same year model harness and ECM. A possible solution would be to have the harness modified or repinned to work with the '92 car but you'll have to change the harness under the dash as they are different as well. Easiest (though not necessarily cheapest) fix would be to get a harness and ECM from a '90-'92 car and swap them in. Check with Angel at TPIParts.com, he can explain everything in detail. I know this is definitely not what you wanted to hear/read. There may be those here who can get you running with what you have but that's what I was told when putting mine together, good luck.