Birty Dastards Jeep Club

Tech Forum => Workshop => Topic started by: puggy on February 29, 2008, 07:04:00 AM

Title: 2001 Diesel XJ No power, Help
Post by: puggy on February 29, 2008, 07:04:00 AM
Hello all My pals 2001 XJ Diesel has a recurring problem, On occasions the car will not rev past 2000 rpm. It runs perfectly just no power past this point.
He can tell when it is going to play up when he switches it off ,the revs surge for a moment before the engine dies , the next time he gets in and starts it ,the problem has come back.
When it is running right it pulls like a train.
So far it has had new EGR valve , MAP sensor and turbo pipes ,no faults show when hooked up to diagnostic computer by expert even when the engine is playing up.
I feel responsible he bought the XJ after seeing how good mine was launching boats.
Cheers Puggy :?:
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Post by: Mike Pavelin on February 29, 2008, 07:44:33 AM
Most likeley culprits are No'1 injector needle sensor, crank position sensor or throttle position sensor, but it could be the pump itself.
Best bet is to go to a Bosch injection specialist as they have access to the Bosch diesel controller.
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Post by: droidy on February 29, 2008, 09:21:35 PM
dont know if this helps but my 97 xj diesel had this problem but it was there all the time.
In the end it was the thermostat which someone had removed the workings to disguise a over heating problem.
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Post by: barttheguinnessguy on March 01, 2008, 12:00:28 AM
I had a simmilar problem. It was a loose / leaking fuel filter
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Post by: Bubba on March 01, 2008, 10:31:08 AM
yup you are sure you are not getting deisel foaming from a tiny air leak in to the system
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Post by: demonicwillow on March 01, 2008, 01:42:33 PM
Where is the diagnostic terminal on the turbo diesel??? also it could be going into some form of limp home mode which cuts the engine power output to try and save any damage to the engine.
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Post by: Mike Pavelin on March 01, 2008, 05:39:52 PM
It is in limp mode. He needs to get the Bosch controller scanned.
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Post by: puggy on March 02, 2008, 11:01:20 AM
Thanks for all the ideas , my pal was at a loss with this one ,he is going to have the Bosch controller checked asap.
I know he has been impressed with the speed and knowledge of the responses.
Puggy
Title: Re: 2001 Diesel XJ No power, Help
Post by: MuckShifter on March 17, 2008, 06:40:46 PM
Quote from: "puggy"
Hello all My pals 2001 XJ Diesel has a recurring problem, On occasions the car will not rev past 2000 rpm. It runs perfectly just no power past this point.


Hi puggy,
Watching this thread with interest, my 98xj td has this problem, only it isn't 'recurring' it's full-time.
Starts & revs fine when standing, then the rpm deteriate up through the gears when driving down to 2000 rpm in fifth = 60mph.

I hate to admit it but the problem occured after I pressure washed the engine, I did take care not to wet the electrics too much, but with so many sensors etc, it's damn near unavoidable.

Since dried everything of with airline & drowned in wd 40 to no avail?

I'd appreciate any feedback on your pals plight - cheers.
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Post by: Mike Pavelin on March 17, 2008, 07:42:09 PM
The most likeley suspect if you've jetwashed it is no'1 injector needle sensor. They hate water.
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Post by: MuckShifter on March 18, 2008, 06:52:32 AM
Thanks Mike,
Any test I can carry out, or just replace it, looks expensive m8?
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Post by: Mike Pavelin on March 18, 2008, 08:21:28 AM
Go to a Bosch centre and get the diesel controller scanned for faults.
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Post by: MuckShifter on March 18, 2008, 05:43:41 PM
'Bosch centre' it is - thanks again for the advice.
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Post by: MuckShifter on March 19, 2008, 06:54:21 PM
Quote from: "Mike Pavelin"
Go to a Bosch centre and get the diesel controller scanned for faults.


Right on the button Mike about the no' 1 needle valve sensor :

" Control module diagnosis Jeep Diesel EDC MSA 15.5 Error memory
  4609 Needle sensor signal too high "

Well done that man  :-D