Cold start rough idle and stalls?

HACKWORTH9090

MEMBER
2000 JEEP CHEROKEE
4.0L
6 CYL
4WD
AUTOMATIC
180,000 MILES

I have the vehicle listed above XJ, that when I cold start it, it will idle for a few seconds, and then stall unless you keep your foot on the gas pedal has new fuel pump Mopar throttle position sensor, new IDC, have tried new cam, shaft sensor, and TPS. After the temperature goes up idle and runs great. Any suggestions?

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

Do you have any codes? We should run them in case any are stored. This guide can help:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

I have seen a vacuum leak cause this problem as well as a faulty engine coolant temperature sensor. Please go over this guide when the engine is cold only:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Here is the location of the engine coolant sensor so you can swap it out if you don't find any codes or leaks. Also, have you serviced the throttle bore?

https://www.2carpros.com/articles/throttle-actuator-service

Check out the images below. Let us know how it goes.

Image (Click to make bigger)

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Thursday, November 9th, 2023 AT 10:14 AM

HACKWORTH9090

MEMBER
2 POSTS

I am not getting any codes at all, I have cleaned throttle body, but I will check temperature sensors and look for any vacuum leaks to see if that helps.

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Tuesday, November 14th, 2023 AT 4:04 AM

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

Yep, that will be the next step. Please let me know. I have seen the MAP sensor start to go out and cause this problem without giving a code FYI. Check out the images (below). Please let us know what happens.

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