Hello all,

I’m still having a warm idle problem on my 80' 242 but only after the car is turned off for 5-10 minutes.

1) Starts and idles GREAT when it’s cold

2) Starts and idles OK when warm but only if it is restarted immediately after turning motor off.

3) Starts and idles VERY RUFF, shakes and acts like it wants to die when warm if restarted 5-10 minutes after motor has been off. This then clears up after I hit the gas a couple of times. (if I let it sit long enough to get cold it will start and run great.)

Here is a list of items I have replaced new so far:
• Complete tune-up with plugs, cap, rotor & wires.
• Compression check OK
• Flame trap
• Lambda oxygen sensor
• All vacuum hoses
• Fuel injectors
• Fuel filter
• Engine wiring harness
• In-tank fuel pump
• Main fuel pump
• Fuel accumulator
• Checked all fuses

This problem has gotten somewhat better after all the above but is still a major problem.

Anyone have any ideas on where else I can look to solve this problem?

Thanks,
Dale

Your list looks a lot like the one I have also. I have the same issue for both my CIS cars a 75 242 w/B20 and a 78 245 w/B21. Both engines are fresh and everything that can be cleaned or replaced has been done. For now I give up. It is not a problem with performance or reliability. Just annoying.

Well your replacement list looks almost exactly like mine. The thing I didn't do right away was to replace my Idle Control Valve (CIS Motor). Once I did the smooth idle returned, no more cutting out. The CIS motor looked like it was OK as far as all the testing I did, but it was just so worn out that it was not opening and closing to the original factory tolerances. Don't know if the 1980 has a similar idle valve arrangement as the 1983 ?, but if it does this is one of the prime suspects.

Couple ideas:

Dirty throttle body? Throttle butterfly could be not closing all the way, thus idle position switch is not activated.

Idle motor is FUBAR?

AMM is toast? When the car is doing its bad idle, disconnect AMM and see if things clear up.

Good luck.

-J