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2.8CRD Hiccup-jerk during acceleration, when running hot
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Author:  jeepaddict [ Wed Feb 24, 2010 3:15 am ]
Post subject:  2.8CRD Hiccup-jerk during acceleration, when running hot
I have a 2005 KJ Renegade 2.8 CRD with 109000kms on the clock. My problem: When the engine is running hot (specially after sitting in traffic jams), and I get to accelerate on open road (simple steady acceleration), the engine will give a 1/2 second hiccup-jerk (only way I can describe it), it's as if it's trying to change down from Drive to 2nd or 1st gear. Very scary, as it is as if the vehicle wants to stop, but doesn't. It will hiccup-jerk violently for about 1/2 sec and then continue. If it is running really hot, it may do this another few times, always and only when accelerating. It never shows this symptom when cold. At first, I used to be worried to see the water temp running close to the red line after being stuck in traffic, but the fan kicks in and the water levels are fine. The 'hiccup' issue is very worrying. Desperate for advice/suggestions.

PS. This is my 4th Jeep - previously owned Grand Cherokees, with not a single problem. This is my 1st diesel and I have had lots of niggly issues. (Recently replaced both inlet and outlet turbo hoses (of course, they blew in the middle of nowhere, within a month of each other, on two separate out of town trips). Didn't know some rubber hoses would be so darn expensive to replace!

Cheers
Author:  JL Rockies [ Wed Feb 24, 2010 10:23 am ]
Post subject:  Re: 2.8CRD Hiccup-jerk during acceleration, when running hot
Soon this thread will be moved to the CRD section where top men can comment about tunes, bypass circuits and general malaise.

If I were to guess why all these are related, I'd say your CRD is due for a trip to the dealer for a re-flash of the computer to handle the shudder and a check of trans fluid levels.

Many peeps have issues with temps increase while climbing steep grades, the fan clutch seems to be particularly fragile in he 05. Check to see that the small condenser fan in front is also spinning when the temps are so hot, those babies break when gazed upon cross-eyed.

a salam alaikum
Author:  JL Rockies [ Wed Feb 24, 2010 10:23 am ]
Post subject:  Re: 2.8CRD Hiccup-jerk during acceleration, when running hot
Soon this thread will be moved to the CRD section where top men can comment about tunes, bypass circuits and general malaise.

If I were to guess why all these are related, I'd say your CRD is due for a trip to the dealer for a re-flash of the computer to handle the shudder and a check of trans fluid levels.

Many peeps have issues with temps increase while climbing steep grades, the fan clutch seems to be particularly fragile in he 05. Check to see that the small condenser fan in front is also spinning when the temps are so hot, those babies break when gazed upon cross-eyed.

a salam alaikum
Author:  mikey1273 [ Wed Feb 24, 2010 10:29 am ]
Post subject:  Re: 2.8CRD Hiccup-jerk during acceleration, when running hot
you should have asked this In the CRD section were it woould get more attention from CRD owners. I am new to the diesel jeeps myself but I would suggest cleaning the MAP sensor on the back of the manafold if you never have. it could be a fuel problem too if it feels like the engine might die then comes back. how long since you changed or fuel filter? maybe its full of dirt and your not getting good flow.
Author:  BVCRD [ Wed Feb 24, 2010 11:12 am ]
Post subject:  Re: 2.8CRD Hiccup-jerk during acceleration, when running hot
jeepaddict wrote:
I have a 2005 KJ Renegade 2.8 CRD with 109000kms on the clock. My problem: When the engine is running hot (specially after sitting in traffic jams), and I get to accelerate on open road (simple steady acceleration), the engine will give a 1/2 second hiccup-jerk (only way I can describe it), it's as if it's trying to change down from Drive to 2nd or 1st gear. Very scary, as it is as if the vehicle wants to stop, but doesn't. It will hiccup-jerk violently for about 1/2 sec and then continue. If it is running really hot, it may do this another few times, always and only when accelerating. It never shows this symptom when cold. At first, I used to be worried to see the water temp running close to the red line after being stuck in traffic, but the fan kicks in and the water levels are fine. The 'hiccup' issue is very worrying. Desperate for advice/suggestions.

PS. This is my 4th Jeep - previously owned Grand Cherokees, with not a single problem. This is my 1st diesel and I have had lots of niggly issues. (Recently replaced both inlet and outlet turbo hoses (of course, they blew in the middle of nowhere, within a month of each other, on two separate out of town trips). Didn't know some rubber hoses would be so darn expensive to replace!

Cheers






Could be a number of things including TCM needs reflashed, air in fuel head needs burped, TC might be trying to freeze up. Blead the air out of your fuel system, and if it continues, best to take it in and have it plugged in.
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