XJ 2.5TD VM... weird problem!! - AUSJEEPOFFROAD.COM Jeep News Australia and New Zealand


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Old 08-05-2013
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Default XJ 2.5TD VM... weird problem!!

Hi all. Im new to AJOR. I live in South Africa. Few months ago i bought a 2001 XJ (2.5td VM engine). She is in great condition, inside and out, really in love with this Jeep! And the engine seems to have been maintained nicely by the previous owner.

Here in SA however, not many mechanics know much about this VM engine and parts are hard to locate. Also, parts from the jeep agents are extremely expensive. So before i go replacing parts that dont need to be replaced, i am hoping you guys on AJOR may be able to help me pinpoint what the problem is with my Jeep.

She ran beautifully for the past few months. (except i dont know why she is so sluggish on take-off, in first and second gear, and especially if taking off on an incline. and she boosts only after 2000rpm? is all this normal behaviour for a 2.5 vm xj??)

Anyway heres the main problem thats started recently:
She is randomly going in and out of limp home mode. One minute she is stuck on 2000 rpm, wont accellerate past that,,, then after a while she drives normally, boosts normally. Then at any given moment, she goes back into the limp mode! Also, ever since this limp home mode problem began, i noticed that the engine is noisier than usual. sounds like a tractor now!

Fuel and air filters have been replaced. The no.1 injector is my suspect, but i really dont want to guess around. (new no.1 injector costs R11 000-00 at jeep dealership!) The diesel pump has been re conditioned. Glow plugs are new. i always use only high quality diesel at all times. What on earth could be the problem guys? some advice would be greatly appreciated

PS. whenever she does get out of limp mode, she drives very well, turbo kicks in as normal... just trying to rule out a turbo problem
But as i said earlier, shes always been like a donkey on take-off, so i dont know if that has anything to do with this problem i am experiencing now
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Old 08-05-2013
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Welcome to AJOR !!
I had the #1 injector problem about a year ago.
If you look in the XJ section in the VM diesel sticky you will find details of a place in Lithuania that may be able to supply you with a good second hand #1 injector.
Have you tested the resistance? Should be ~ 80-100 ohms. If its higher tan that you have a problem.
When mine went into limp mode, it was fine up to about 2000 rpm & then was gutless. Mine has plenty of pull from idle up. Your waste gate could be jammed open or your EGR valve could be jammed open.
Best get rid of the EGR. The waste gate can be tested by applying pressure to the dash-pot & watching the shaft move. If it doest move with ~15 # pressure its faulty.
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Old 09-05-2013
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i second the egr valve my xj is playing up at the moment and i think it's the same thing. if its stuck open you will be losing intake manifold pressure and therefore boost/ power and the engine/ turbo will be working harder to keep the car moving (which could explain your issues in lower gears)

how is your fuel economy ?
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Old 09-05-2013
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Quote:
Originally Posted by JEEPADDICTION View Post
Hi all. Im new to AJOR. I live in South Africa. Few months ago i bought a 2001 XJ (2.5td VM engine). She is in great condition, inside and out, really in love with this Jeep! And the engine seems to have been maintained nicely by the previous owner.

Here in SA however, not many mechanics know much about this VM engine and parts are hard to locate. Also, parts from the jeep agents are extremely expensive. So before i go replacing parts that dont need to be replaced, i am hoping you guys on AJOR may be able to help me pinpoint what the problem is with my Jeep.

She ran beautifully for the past few months. (except i dont know why she is so sluggish on take-off, in first and second gear, and especially if taking off on an incline. and she boosts only after 2000rpm? is all this normal behaviour for a 2.5 vm xj??)

Anyway heres the main problem thats started recently:
She is randomly going in and out of limp home mode. One minute she is stuck on 2000 rpm, wont accellerate past that,,, then after a while she drives normally, boosts normally. Then at any given moment, she goes back into the limp mode! Also, ever since this limp home mode problem began, i noticed that the engine is noisier than usual. sounds like a tractor now!

Fuel and air filters have been replaced. The no.1 injector is my suspect, but i really dont want to guess around. (new no.1 injector costs R11 000-00 at jeep dealership!) The diesel pump has been re conditioned. Glow plugs are new. i always use only high quality diesel at all times. What on earth could be the problem guys? some advice would be greatly appreciated

PS. whenever she does get out of limp mode, she drives very well, turbo kicks in as normal... just trying to rule out a turbo problem
But as i said earlier, shes always been like a donkey on take-off, so i dont know if that has anything to do with this problem i am experiencing now
EGR could be sticking up or a sticking wastegate.. .. does the engine run hot at times? Not over heating, but just hotter than normal..
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Old 22-06-2013
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Thank you for this thread gives me an idea as to one of the many problems i'm having also have a major oil leak coming from around the rocker cover intake manifold any ideas.
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Old 23-06-2013
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Default XJ 2.5TD VM... weird problem!!

Any chance you could put a picture up ?
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Old 23-06-2013
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Yeah will take one in a bit and put it up. I have the water gallery off etc... So I could Inspect the oil feed lines into the heads the line itself seem fine a bit suspect on one of the bolts. also while disecting found a lot of oil in the intercooler pipes and cooler itself, think turbo may need a seal kit put threw it or it it a posible wastegate stuck open could cause this as my truck struggles to take off when on a hill.
Thanks for taking the time to help I really appreciate it, it has been interesting coming over from a 4.0 grand to the 2.5vm Cherokee mechanically speaking.
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Old 23-06-2013
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Default XJ 2.5TD VM... weird problem!!

Funnily enough I think I might have the same oil leak around the turbo feed line it's a pain to see in there but I also have a bit of oil smeared around intake manifold from the intercooler hose and a bit of a leak at the intercooler.

I had an issue with the oil separator, replaced it with a catch can and found that stopped a lot of the leaking. I think the diaphram inside had broken and was causing the engine to over pressurise. From memory you can pick up seal kits from eBay UK.

Do you have much play in the compressor wheel on the turbo ?
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Old 01-07-2013
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Hi, just my two cents worth, I've been chasing lack of power issues for month now! It was in a limp mode, turbo kicked in until about 2000rpm then power died off, mine was initially fixed with a second hand MAP sensor, instant fix. A thousand ks later and i got some surging/misfiring and I'm back in limp mode. I'm yet to chase this problem up but....
One thing that got me was by disconnecting both temp gauge wires it went into another limp mode where it wouldn't rev more than about 1000rpm. Everyone i talked to said there was only 1 limp mode so look at fuel, air, turbo etc.etc. I now have a diagnostics book which says they have 3 limp modes.
1. 10% torque reduction
2. 50% torque reduction
3. Revs set at 1000rpm.

The other thing was working out i had a dud sensor. I removed the map sensor from manifold, unplugged it, put a jump wire between 1 of plug and 1 of sensor (earth), same for 3 to 3 (5v supply).
Now turned ignition on, sensor is now powered up. #2 of sensor is for temp, with a volt meter touching #2 i put tip of sensor in my mouth and the volts rapidly changed. Same for #4 of sensor except this time lips around sensor and blowing, volts didn't change! So wasn't reading a change in boost pressure.

I couldn't find anywhere which says how to test a sensor so sort of fumbled my way to this test. I don't have any volts which they should be but figured if they didn't change with a change of pressure or temp then it wasn't working.

Anyway i hope this helps, and hope anyone could suggest what my surging would be...
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