Olds Cutlass Supreme 3.1 Stalling/Idling Problems

[pocket-rocket]

Two problems working together is never fun. At least you have one taken care of and can get this other one knocked out in no time

[13btJim]

I changed out the ICM and still am having hard starts and the car is still running extremely rich. I am not sure about the mpg''s but I would guess around 12-13 mpg, so it is running very rich. The car is also only doing this when it is at operating tempurature.

[13btJim]

Somewhat of an update, I replaced the spark plugs again, and spark plug wires.....again and cylinder 6 coil. Also I changed the O2 sensor. Still not much of a change. The car is not firing properly on cylinder 6. The compression is fine on this cylinder, there is spark, we put a node light on the injector and it is firing, but there is a misfire between 1500-2000 rpms. The cylinder is also loading up with fuel. Anybody have any ideas? Could the ECM be bad? The wires going to the injector is fine. I dont know what else it could be.

[bszopi]

Injector could possibly be stuck open if the cylinder is filling up with fuel.

[13btJim]

I was thinking that too but we put a noid light on the injector and it seems to be fine....Plus I bought all 6 of them as newly remanufactured and they came with a flow spec sheet and what not. I will give the guy that I bought them from a call. He may be able to clear some things up. I am really stumped on this one, so stumped that for the first time in my life I might take a vehicle to a mechanic

[pocket-rocket]

Maybe your ICM is bad?

[bszopi]

If you are able to read the codes, which it appears you are, swap the coils around and see if the misfire follows. That will tell you if its a bad coil or not.

[13btJim]

Funny thing is, is that I did change out the ICM and the coil on cylinder 6, no change really.

[13btJim]

I did some more work this weekend on the car and discovered that the injector on cylinder 6, even being brand new, was no good. I pulled the injector out and was able to blow right through it without a problem, so at 40 psi of fuel pressure it would be pretty leaky. It fixed the problem and the car runs great again. Thanks for the help guys!

[bszopi]

Injector could possibly be stuck open if the cylinder is filling up with fuel.

Woohoo for me! You can never guarantee a part is good, even if its brand new.

[Supreme Cutlass 1994]

Hey 3 things come to mind for me.
1) Pull the spark plugs, are they fouled ? or does they look like the engine is running lean ?
2) Idle relearn after any of the many things that you tried to correct your problem?
3) Any codes past or present ?