Engine won't idle - JeepForum.com

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post #1 of 3 Old 12-27-2012, 10:22 AM Thread Starter
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1998 XJ Cherokee 
Join Date: May 2011
Location: Sheffield Beach
Posts: 36
Engine won't idle

When my 2001 4.0 liter reaches running temperature, it refused to idle and cuts out. It starts up immediately yet still won't idle. Dealership ran diagnostics and a faulty cam sensor was said to be the blame.

We have replaced the following:

Cam sensor
Map sensor
Wiring from the cam to the injectors and inlet manifold sensors
Exhaust sensor and air flow sensor on inlet manifold (replaced these with working second hand parts)

CPS sensor recently replaced (with new Mopar part)

Dealership has had the vehicle for 5 weeks now and are stumped.

Pllllllleeeeessse help !!

jeeporiwalk is offline  
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post #2 of 3 Old 12-27-2012, 10:36 AM
It's the crank sensor!
tjwalker's Avatar
1999 XJ Cherokee 
Join Date: Nov 2007
Location: Central Minnesota
Posts: 8,758
Is it still setting a code after doing what you did?

If so, please post the EXACT CODE number(s) here for the most accurate replies.

Gotta follow the codes. With OBD, the devil is in the details. OBDII isn't perfect to be sure, but it's awfully darn good at pointing to the offending circuit.

99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!
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post #3 of 3 Old 12-27-2012, 11:04 AM Thread Starter
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1998 XJ Cherokee 
Join Date: May 2011
Location: Sheffield Beach
Posts: 36
No code coming up now?
jeeporiwalk is offline  

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