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| Engine "Hiccups/jerks" when running hot http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=50695 |
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| Author: | jeepaddict [ Wed Mar 03, 2010 3:07 pm ] |
| Post subject: | Engine "Hiccups/jerks" 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. |
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| Author: | linewarbr [ Wed Mar 03, 2010 3:16 pm ] |
| Post subject: | Re: Engine "Hiccups/jerks" when running hot |
Sounds like an air-in-fuel issue to me. Try priming and bleeding the fuel filter and/ or changing the fuel filter. |
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| Author: | MrMopar64 [ Wed Mar 03, 2010 4:18 pm ] |
| Post subject: | Re: Engine "Hiccups/jerks" when running hot |
To me it sounds like you have forthcoming EGR issues. The hiccup/jerk you feel I'm betting is actually misfire from the EGR valve not closing fast enough and the fresh air mass into the engine is too low to sustain stable combustion. Since you noted your odometer in km versus miles, I take it you're not in North America? This could lend itself to why you haven't set a Check Engine Light yet. |
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| Author: | CRDMiller [ Fri Mar 05, 2010 5:35 pm ] |
| Post subject: | Re: Engine "Hiccups/jerks" when running hot |
Unplug the MAF sensor on the air cleaner assymb and if your troubles end, you'll know it was the egr valve. |
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