djm_e22

iTrader: (2)

Well my new engine is finally done. But when I go to start it, it will only run for 3 to 4 seconds than die. Is there anything I could have disconnected that is causing it to die after a few seconds?

Also I have converted over to OBD1 and changed the knock sensor. Was I suppose to do anything else? Would it hurt if I put my OBD2 PCM back in just to see if it will stay running? The OBD2 PCM has a tune for a completely different cam, but I figured if I didn't WOT I would not hurt the engine. Correct?

I won't be leaving the OBD2 PCM in, just trying to see if the OBD1 PCM is bad.

wysemunky

iTrader: (2)

does the OBD1 PCM have VATS disabled?

gregrob

iTrader: (8)

That ^

And I've seen this happen if your I injector size is WAY off

djm_e22

iTrader: (2)

Not sure. I'll have to ask the tuner. I did a mail order for now. If the VATS is not disabled, will the car start up for a few seconds then die like mine is?

gregrob

iTrader: (8)

Possibly. Do you have your own cable or did you send in your pcm

djm_e22

iTrader: (2)

I sent it to Moe Bailey. I'll get in touch with him. I can try and see if somebody has a cable here locally.

djm_e22

iTrader: (2)

Well switched to my OBD2 computer and it now does not die. Is there a way to disable or bypass VATS without sending off the computer?

gregrob

iTrader: (8)

If you have your own cable....

djm_e22

iTrader: (2)

I thought I read something about a bypass module you could use. Maybe that was something else. I'll just send the computer off again.

Lawhead

iTrader: (14)

There is 2 parts of VATS there is the chip inside the car that won't let the car turn over at all. Then the one in the computer which cuts off fuel

BigD383lt1

just out of curiosity did you have to change out the coil... I was told you had to use the coil that goes with the pcm.

jester1614

iTrader: (13)

if your referring to the ignition coil, thats not true as i am running an msd coil in my car

BigD383lt1

there are two different year(style) coils one for the obd1 pcm and one for the obd2 pcm that does not have anything to do with the brand of the coil. I did a motor swap and put a 96 motor in a 94 car I was told to use the coil for the pcm not for the motor! I am not saying this the problem but would be very simply fix if it was.

djm_e22

iTrader: (2)

But if I had the wrong coil it shouldn't run at all. Correct?

BigD383lt1

not sure but if it running with the other pcm and not this one it is something to look at. I really don't know if it will cause the car to do this I just know that I was told to run the coil for the type of pcm not for the year of the motor.

djm_e22

iTrader: (2)

If my tuner emails me back saying the VATS is disabled. I will definantly give the coil a try. Thanks.

katz_2003

iTrader: (5)

Make sure your Mass Air Flow is hooked up. It needs to read the air comming in to the engine...if mine is unplugged or not hooked up (connected to throttle body) then mine will start then die after a few seconds

BigD383lt1

yes but he says it runs with his stock pcm...