Increasing engine idle.

Topic: Increasing engine idle. (Read 1796 times) previous topic - next topic

Increasing engine idle.

October 27, 2004, 10:36:13 AM

How do I increase the engine idle on a V8 EFI 302? (1986 Cougar)
Cause after the engine idles down it stutters and then stalls.

Re: Increasing engine idle.

Reply #1 – October 27, 2004, 10:49:19 AM

As far as SEFI you really can't increase the idle. I suspect your Idle Air Control motor to be at fault. Don't adjust the screw on the TB, though.

Re: Increasing engine idle.

Reply #2 – October 27, 2004, 11:09:18 AM

Mine will do that when the temperature is at a certain point. I couldn't tell you offhand what it is, maybe mid-30s, but when a day comes that it is that temp, I can tell you that my car will do it. If it is warmer, or colder, it's fine.

Re: Increasing engine idle.

Reply #3 – October 27, 2004, 12:03:15 PM

With the engine warmed up(and off), disconnect the IAC. Restart the engine and see if it will idle on its own, if not adj the screw on the throttlebody for a slightly less than normal idle. This usually helps a cold stall. If you still have a problem, clean the IAC(would be a good idea anyway). Problems after these would indicate a out of calibration temp sensor, dirty injectors, maybe even a bad fuel pressure regulator(was the problem on my nephews 4 cyl Stang).

Re: Increasing engine idle.

Reply #4 – October 27, 2004, 01:30:44 PM

Bring the engine up to normal tempurature.
Disconnect the battery for 5 mins to erase eec.
start the engine and allow it to idle for 2 mins to relearn idle speed.
Check tps voltage - .98-.99v between black and green wires KOEO.
If your problem persists repeat the process but adjust idle screw before the 2 minute idle session