i have the motor/trans in my camaro now... i tried the engine swap forum and got little help.

so, im coming here now. my fuel pump is not getting fuel with the v8 harness, i have to manually give it 12v power, which is fine, i dont mind that. it comes on when the computer comes on, just like my mpfi... after i rigged it.

next thing, when computer is on (and fp), and engine is started, its running like poop, but if i unplug the comp/fp it runs better, but still stutters. anyways, i need some advice on how to actually make my car run! lol. i have to floor it to get the car to go 2 foot

 

anyone? what do i need to do to my car to help change it from 2.8 mpfi setup to 5.7 tbi? do i need to get a separate regulator, do i need to change my fuses some? i know someone else here has done a 2.8 to tbi swap... i tried the engine swap and no one can help me either.

 

Did you replace the fuel pump? A 2.8 pump will not support the amount of fuel that a 5.7 needs. Unless you installed a tank with pump from the 92 tbi car and all its fuel lines.

 

its getting too much fuel atm... after i turn off the fuel pump, it acts better, but eventually dies from no fuel.

have you done a 2.8 mpfi --> 5.7 tbi? if so, then i'll gladly change the fuel pump, but atm i think there is a better alternative.

 

Are you running a FPR? Make sure that its set between 16-18 PSI. If you are not running a FPR, you will need one since direct injection pushes more PSI than a TBI can handle. Mine is a 92 that went from 3.1 to 5.7 and I have surging idle I am trying to fix. I had to change the pump to keep it from constatly flooding (thats when a budy told me I should have ran a fuel pressure regulator).

 

oo awesome, i'll go pick one up on payday anything else you have done (wiring wise, or anything else) to the car to make it run correctly?

 

If you can find a 305 TBI harness for cheap, it might help. However, if you are familiar with mods your current harness deos not need to be changed. Other than the fuel pressure, did you change you chip set for your ECM? That would be the last thing I could think of. I am waiting for a ALDL cable to do datalogging so I can see what else needs to be done.

 

i have the whole uncut 92 harness and computer. its only the regulator that needs adjusting right? anything else?

 

i bought another regulator, and it still does the same thing... i think its a wiring issue between my 89' setup and my 92 setup.

anyone on this board go from an earlier car to a 91-92? anything anyone else can add? the car starts and barely moves, but its either getting way too much gas, or not enough. both injectors work and both wires work, they are just not both spraying...

i know its just a wiring issue, and maybe a fuel pump issue, but for the most part im sure its just a wiring issue, since the car will run w/ my current fuel pump.

anyone? i would really appreciate it! =)

 

Oh my gosh i didn't think anyone else was dumb enough to do the same conversion as me. 89 2.8 to 350 with 91 TBI 305 wiring.

Did you solve the Pass key problem?

What gage cluster did you use? Did you rewire it?

 

I see what you did. You bypassed the wiring harness with a 12v lead to the Fuel pump. The problem is that there is a anti theft system called the pass key system. Its in the 89 and the 92 but its a different frequency (pluss GM rewired the 90-92 car.) What it does is look for a certain resistance from the resistor in the key to ok the computer to start the car. Once the comp has the signal it grounds itself out at 40 times a second (that way the thief couldn't just ground it to steal the car.) So when you bypass the wiring to start it it works but then it dies when the comp is supposed to take over the injecting.

I bought a pass key bypass box for about $30 from this one company. Ill have to get back to you on it.

The other thing is that the 90-92 gage cluster is wired differently than the 89 and the V6 vs a V8 cluster is as well. The 92 gages wont fit in the 89 dash right?

My dad helped me find the pin outs and rewired it.

so any questions just ask

-Rob

 

If it helps at all i have an 89' Camaro and i went originally to a 91 blazer 350 tbi then it was a junk motor (but it did run just burned alot of oil) then i went to a 88' Blazer 350 TBI and she runs good. If you want to ask me anything go for it i have some knowledge of my swap. THe only diff is it was easier for me b/c i had the 305 TBI originally.

 

well, the pump runs and the computer turns on if i ground out the relay (black wire)... but the injectors aren't wanting to spray, unless i give them +12v manually through the fuse block.

the pump turns on and the computer turns on when grounded, but no injectors >.<



any ideas anyone?

about that passkey... it should work just fine, i can manually start the car like i have been, which is crossing the hot and ground side of the starter -- i linked up 2 wires and a push-button starter so that i can turn the engine while not in the drivers seat... it will run, but very, very choppy with 1 injector at 12v.

thanks for any help

-Scott

 

anyone? help with making comp and injectors fire?

 

sounds like your trying to bypass the vats the wrong way. u shouldnt be bypassing the starter and fuel pump and all that, bypass the vats the right way and go from there. if you want you can put in a computer from a TBI truck, no VATS, like is in my camaro now. it has no electric fan control though you have to have the a/c on for the fan to work. but im fixing that, got a new steering column with keys and vats module that im about to put in.

 

interesting... im just kinda curious as to why i need to bypass the vats now, vs when it went out in my 89?? it went out 1.5 years ago and i just used the push button starter... what changed between the 89 and 92? and... my security light is not turning on saying that the vats is messed up?

 

not sure how you coulda started the car with a push button since the vats sends a signal to the computer to turn the injectors on. unless the 89 is different. your security light probably isnt wired the same. have you checked for any codes? the computer will not fire the injectors unless the vats tells it to or unless the computer has the vats programmed out of it.

 

i will try and pull the codes, its just hard because the computer doesn't exactly have its own power given to it... it clears everytime i pull the plug lol.

 

stop rigging stuff up man! lol if you want a good running vehicle wire it up like its supposed to be, disable the vats the right way if you have to, or diagnose what failed it in the first place, your just asking for trouble down the road, imo.

 

well the thing is... even if the key is in the "on" position, the computer should still light up (by itself)... and it's not even doing that. what would i do to give power to the computer?

the computer always got power when the vats was working, or when it was not...

 

are your lights/radio coming on with the key in the on position? could be a bad ign switch or something.

 

yeah, my radio, interior lights, head/rear lights all come on... and when i turn the key to the "start" position, the seat belt light even comes on