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| wierd rough idle http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=1&t=74680 |
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| Author: | ncjeep [ Tue Mar 26, 2013 8:13 pm ] |
| Post subject: | wierd rough idle |
I have a weird problem that i need help with. engine cranks just fine as soon as key turns. will idle fine til warm will idle pretty good in park when warm after warm it will idle so rough everything vibrates in drive and reverse while foot on brake but will idle fine in drive and reverse if i take foot off brake. no generic or enhanced codes are showing up. run full diagnostic and everything is showing fine except o2 heater sensor 2 is showing double its max. i have replaced EGR valve, IAC, MAP, PCV valve and air filter. also i traced out all hoses and found 1 that was shot so i replaced it. checked MAF and it looks fine. any help would be great. i have been working on this problem for over a week. thanks |
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| Author: | papaindigo [ Fri Mar 29, 2013 12:33 pm ] |
| Post subject: | Re: wierd rough idle |
Given the MAP/MAF/EGR references I assume you have a KJ CRD. When you say it idles rough is it more like the engine is shaking but the rpms at idle stay steady? If so I'd speculate that both your motor mounts are shot. Generally you can tell which one by putting your foot on the brake and seeing whether the vibration is worse in drive or park. Since you say it's bad in both I'm guessing both mounts are bad. Why, if it's mounts, it would do this only "after warm" I have no clue but rough with brake on and not with brake off does not, to me at least, suggest an engine/fuel/drive line problem. It's not terribly hard to pull the passenger side motor mount (see http://www.greendieselengineering.com/f ... t/115.page) to check it. If torn or when shaken the mount sounds like it's full or marbles then the mount is shot. FYI left and right mounts are identical but for the heat shield. You can save about $10 by ordering 2 driver side mounts (52129011AD) and swapping the heat shield from your old passenger side mount to one of the new ones. Drivers side mount is apparently harder to do but still can be DIY. Drop me a PM or email if it's mounts or something else. |
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| Author: | ncjeep [ Fri Mar 29, 2013 1:03 pm ] |
| Post subject: | Re: wierd rough idle |
awesome! Thanks i will check it out! |
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