Jeep rough idle when cold

jeep
cherokee

#1

On my 1991 Jeep Cherokee, 6 cyl 4.0L engine, automatic, after it sits 4-5 hours (cold engine) starts, but has a tendency to stall unless you keep giving it gas.

The MAP sensor and the IAC idle control valve have been replaced recently. I am thinking it might be the TPS throttle position sensor since it is original and that’s 16 years old. The engine itself is a rebuilt with less than 15,000 miles on it.

Thanks Hal


#2

I’d be more inclined to suspect the temp sensor. The ECU may not know the engine is cold.


#3

Hi,
Can you be a little more descriptive on which temperature sensor? Would it be the
Air Charge Temperature Sensor?
Thanks
Hal