lakodathecat

I have a inline 6 93 grand cherokee in excellent condition. Thing is when then outside temperature is in the 30-40's the car idle's very rough even after it been driven for a long time. When the outside temp warms up to 70's the car idles fine. I can't figure out what sensor would be so dependent on outside air temperature. MAP?
Thanks for your help, love my GC.

I live in nashville so we have cold days and warm days, runs great when warm outside, bad when cold outside

tiwvr1

Any check engine light?

lakodathecat

After searching more it was like DOH, Intake Air Temperature (IAT) sensor. Just one of those off to the side sensors never change (though I have changed it in the past). It was 35 this morning and car runs smooth. And of course no codes, had one code in 18 years of driving it.

Thanks

Chevokeeman

Have you tried cleaning the throttle body around the blades, a good clean-out with Berrymans carb cleaner will do wonders for a rough Idle, you must remove sensors before soaking though. Could be bad O/2 sensors, at altitude it would run rich, best bet is going to Autozone and have the codes read and that will tell you if you have a bad sensor, could also be a vacuam leak from cracked rubber hoses. Check hoses first then go get a free scan, OB2 ECM's will tell a whole lot about the engine, then if it still idles rough, it's time to clean throttle body. Chevokeeman.