'87 TBI 350 Troubles

[Jake292]

Ohhhhhhhhh...yeah...thats a different ecm, like a 6070 or something.

Would it have worked if it had a th400 instead of the 4l80

 

[Jims86]

yup, The 400 equipped model would have had the 7747.

 

[Jake292]

Got it running last night!

put the new ecm in yeaterday evening and it would start with the wire plugged in but still wouldnt idle. i warrantied the distribuer again and got a set of plugs put those in and it ran.

got it inspected this morning and noticed that when it would idle for a little while like at a stop light, it would start to miss then die completely. i put it in neutral and it starts right up. what could be causeing this?

 

[Jims86]

Got it running last night!

put the new ecm in yeaterday evening and it would start with the wire plugged in but still wouldnt idle. i warrantied the distribuer again and got a set of plugs put those in and it ran.

got it inspected this morning and noticed that when it would idle for a little while like at a stop light, it would start to miss then die completely. i put it in neutral and it starts right up. what could be causeing this?

Have you cleaned the IAC passage? Idles in N and P good, how bout in reverse?

 

[Jake292]

Have you cleaned the IAC passage? Idles in N and P good, how bout in reverse?

reverse is the worst. i havnt checked the iac

 

[Jims86]

reverse is the worst. i havnt checked the iac

Ok, so it dies in gear....with foot on the brake?

 

[Jake292]

Ok, so it dies in gear....with foot on the brake?

Yes

 

[Jims86]

Yes

Ok, that rules out the torque converter locking up.
Have the intake gaskets ever been done?
Maybe a compression check is in order.
At this point, the problem sounds mechanical, and not EFI ralated. The irratic timing you are seeing, may be the system seeing the problem, and in turn, trying to compensate by altering timing and fuel delivery.
A brokent head gasket between cylinders will cause backfiring and detonation, and usually screws the idle.
Compression check is a good start.

 

[Jims86]

also, i dont remember if you did it, But have you done the throttle body rebuild?

 

[Jake292]

Ok, that rules out the torque converter locking up.
Have the intake gaskets ever been done?
Maybe a compression check is in order.
At this point, the problem sounds mechanical, and not EFI ralated. The irratic timing you are seeing, may be the system seeing the problem, and in turn, trying to compensate by altering timing and fuel delivery.
A brokent head gasket between cylinders will cause backfiring and detonation, and usually screws the idle.
Compression check is a good start.

it runs fine just but when it idles for a while in drive it will die. the original problem fo the timing going all screwy is gone.

also, i dont remember if you did it, But have you done the throttle body rebuild?

havent done a rebuild

 

[Jims86]

it runs fine just but when it idles for a while in drive it will die. the original problem fo the timing going all screwy is gone.



havent done a rebuild

The kit is around $40 and comes with new screen filters for the injectors, and a new regulator. Its a guessing game right now. How many miles are onthe engine?

 

[Jake292]

205000. I'm going to drive it like this for a few weeks to see of it will just go away on its own. Might rind some injector cleaner through it.

 

[Jims86]

3m is the **** if you can find it. Seafoam is a close 2nd.