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Stay posted guys, mine is getting even worse and I don't think turning the idle up 50rpms will alleviate the problem anymore ... And I want to know what's wrong, not slap a bandaid over it. I'll be doing new plugs and see if that helps ... Only 62k miles on these oe's but you never know. Keep you posted and let me know any other suggestions. My brothers muscle cars shake less at idle!
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Since you mention a stumble I'm going to go with some possible issues.
1) Torque converter -- when driving from a dead stop in a normal way you will feel a very strong shaking right after the upshift. Put the trans in Sport Mode and it will go away. 2) Rough Idle/Low RPM's you have a ignition issue. Check Coil Packs and plugs. The low idle is a possible vacuum leak. I had these same problems and mine was multiple coil pack and plug failures from oil leaks around the valve covers. I think the wild card here is that I was getting a flashing check engine light showing me a misfire after a while. Prior to when this was just a nuisance it never flashed just ran horribly. I had some hoses that were dry rotting. Replaced those and finally worked out all of the ignition issues and the idle acts right now. |
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One more thing is the oil separator hoses behind the intake. One plugs in to the driver side valve cover and the hoses run back down behind the center behind the intake.
There are two of them around 3/4" OD. They are prone to crack and cause this as well. I had to replace mine. They will look great from the front but to the best of your ability check them on the bottom side and back. Esp where the one connects on the driver side valve cover. |
Also the next chance you get the truck in total darkness open the hood with the top engine cover off. Be careful not to chop your fingers off on the fan since your in the dark (lol) and look at the coil packs. Once your eyes adjust you will be able to see a little bit of flickering through the boots. It should be *very* faint.. just a flicker. All of these should look the same. If you see one that is not really doing much at idle compared to the others then that is your problem.
You could still have a screwed up plug under the pack though. Also, if you see one or more packs that the arc is visible outside that is a failure as well. I had a couple that were arcing out of the pack on to the valve covers. At times you could even hear it pop. |
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Ok... I've got the engine cover off, for about the 10th time in the last 2 months and this is so frustrating.
The CCV or oil separator hoses... I can't see or feel them... and I'm searching online but all I find is 3.0 and M62 pictures... is it different on my N62 2006 ? Does anyone have pictures ? Any help is appreciated! |
Ok. Well I can't find any hoses behind the engine as everyone suggested. I did find two ccv vent hoses on the front in good condition... Unfortunately I broke the connector on one and it should be here Monday to fix it. Pulled the coils and a plug and they are super clean. Plugs look like they are burning great. Not going to replace ...
The fact that turning the AC on fixes or significantly improve it make me and my Audi mechanic buddy think it's not a vacuum problem. Maybe a coil going bad... But no codes. I already replaced the MAF and that wasn't it so im really considering trading in as it needs tires, alignment and brakes shortly and the nav screen is going out. I can't handle fixing all that an still having this worsening idle problem. Any other ideas ? |
Drew any luck with the idle problem?
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