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GThompson51 05-17-2013 04:53 PM

Stalling and rough idle..
1998 Jeep Grand Cherokee
4.0L Automatic

It didn't start one day so through a very long process of trial and error, I replaced the cam shaft sensor, ignition coil and the crank shaft sensor. The problem actually was the cam shaft sensor and it ran fine.
That was a few weeks ago, now she's idling really rough and stalling out. The code I pulled was P0320 but I just replaced the crank shaft sensor. My buddy noticed that the pulley for the a/c compressor isn't spinning the full time and belives that is the answer.
Figured I'd get some opinions.


dusterdude 05-17-2013 05:16 PM

What brand crank sensor?if it wasnt mopar,get your money back and buy a chrysler sensor

GThompson51 05-17-2013 05:19 PM

I think it was duralast. Do they go bad that frequently?

txbass06 05-17-2013 06:39 PM

Most of our Jeeps are picky when it comes to sensors and tend to like Mopar over anything else

dellis 05-17-2013 07:43 PM


Originally Posted by GThompson51 (Post 15446933)
My buddy noticed that the pulley for the a/c compressor isn't spinning the full time and belives that is the answer.

That's normal. The "spinning" only happens when the compressor is compressing.

The P0320 code plus the symptoms you describe indicate that you either have a bad Crankshaft Sensor, the connector is not fully seated, or the wiring was damaged somehow during your installation.

GThompson51 05-18-2013 10:00 AM

Thanks, I took a look at the wiring and it doesn't appear damaged, It is still tight in the hole. I guess I'll go return the sensor and exchange it.

GThompson51 05-18-2013 11:17 AM

Is it dangerous to drive it like this?

JohnCrabtree 05-18-2013 12:03 PM


Originally Posted by GThompson51
Is it dangerous to drive it like this?

Yes. You loose your brake booster and power steering if it dies.

Sent from my iPhone using JeepForum

GThompson51 05-18-2013 12:27 PM

I had an 89 Wrangler that wouldn't stay on and got pretty good and two footing it, neutral at stop lights etc.
My ZJ only stalls out during decel and idle. Is there risk of further damaging any additional parts?

Oldfrog 05-19-2013 12:31 AM

"...My ZJ only stalls out during decel and idle."

Sounds like the IAC needs clean
ing and/or replacing.

AaronButler 05-19-2013 01:47 AM

You are positive that its the pulley on the AC compressor? The air compressor will not spin all the time, only when the pressure gets low, and will constantly be turning on and off while the car is running (and AC turned on). The pulley, however, needs to be spinning all the time.

GThompson51 05-20-2013 10:06 PM

Thanks for all of the replies! The problem was that the crank shaft sensor was about a quarter turn loose. I tried to wiggle it with my hand and it didn't move but I tightened it anyway and sure enough she's purring right along.

GThompson51 05-20-2013 10:07 PM

I'm going to look into cleaning the IAC anyway, that sounds like a good thing to do regardless.

GThompson51 05-20-2013 10:09 PM

The AC pulley itself is spinning but not the compressor. I thought it only spun when in use but I wasn't certain.

The time now is 02:10 PM.

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