Please Help!!!!!!

[junebubby]

We are on the road and having a problem with our WG Grand Jeep Cherokee Laredo, 2004, CRD with the Mercedes 2.7 litre engine.
We have just had a new crank position sensor fitted after WG was not starting after refueling or stopping for a break. A couple of times she just died when slowing down and would not re-start until after about 15 mins. or so. Temperature is normal and she seems to be running well, no weird noises etc..
Jeep dealer found a cam shaft sensor code but advised replacing the crank position sensor first which we did.
WG went well for a couple of days, now she is doing the same old thing. We are 100's of kms from home ( Narrabri NSW ) and are at a loss for what to do. This problem seems to be heat related as it happens when we are towing.

[Jonny Jeep]

If the computer had a code for a cam sensor then the can sensor needs to be checked. (Why the dealer would disagree with the computers diagnosis you'll no doubt be asking them).

In a 4.0 it's in the top of the oil pump drive assembly (as Jeep call it). Since you're not in a position to replace it the best I can suggest is taking it from the top of the assembly just to make sure there are no metallic particles on the sensor which would reduce it's sensitivity. If there are cleaning the sensor may be the best you can do for now.

[darksidecustoms]

I'm also confused why the dealer would disagree with the trouble code???

If its thermal failure you could probably spray water on it to cool it but obviously something you don't want to do every 15 mins....

[junebubby]

The error code was the cam sensor but from their experience it is the Crank sensor that will stop the Jeep running and in the past that is what is usually faulty. They say the cam sensor will not cause the Jeep to stop even if it is disconnected. BTW the cam sensor was the more expensive so they were not up-selling me.

[Dustbowl]

Both Cam and Crank sensors arew subject to heat soaking and thermal failure, replace the Cam sensor, and it will run like new again.
With out a cam sensor your engine does not recieve a fuel pulse, you will notice that your engine runs fine... untill it gets hot.
with a dead cam sensor you may also experience throttle delay.

Now in my time of diagnosing jeeps, your dealer was an idiot, a hard fault at the TPS, or a hard fault in the transmission is repairable by a crank sensor, a cam sensor code is a cam sensor code!
It will only run without one for a certain period of time because of the information from the crank sensor allows the computer to "estimate" the cam angle... But it will certainly stop the car under thermal failure.

A second possible but highly unlikely option is that your new CRANK sensor is dodgy straight out of the box.

now you know the answer

[junebubby]

Many thanks to all who posted.
We are now in Moree and have had a code reader on again after the engine light showed up again and the turbo seemed to die on us. After resting, the engine light has gone and our Jeep is running again for now.
Yes Dustbowl, it is p0340 the cam position sensor and we will be replacing it in Rockhampton in a week's time.
Once again, thanks Jeepers!