Vibration at idle - Mercedes-Benz Forum
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post #1 of 49 (permalink) Old 01-07-2010, 05:12 AM Thread Starter
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Vibration at idle

I have a 1998 e320 with 130,000 miles. In the last 5,000 miles I replaced all four oxygen sensors, MAF and had the transmission fluid flushed at the dealer. I first noticed the vibration after the flush. The car perfroms flawlessly when accelerating and cruising, but when it coming to a stop it "shimmys" ever so slight before stopping then has a LOW grade vibration at stop. If I shift the gear selector to N it ceases. If I do not stand hard on the brake it seems to virbrate more.

I have noticed that these symptoms are absent when the car is first operated and everything is cold. After a few miles are driven and is warming up the smoothness gives way.

Occassionally the vibration is not present during normal operation which makes it difficult to pinpoint because of the intermittance.

Anyone have an idea? Does this sound like a torque convertor issue? I have taken it to the dealer twice for this vibration, but they were less than helpful in coming up with anything.
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post #2 of 49 (permalink) Old 01-07-2010, 06:00 AM
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Let me be the first to take a stab at this......engine mounts? Have they ever been changed?

My 01 E430 has a vibration too but its at highway speeds. It is much worse when its cold unlike yours. I think my mounts are shot but I need to save a few bucks to change them........maybe next month.....

Jeff

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post #3 of 49 (permalink) Old 01-07-2010, 06:13 AM Thread Starter
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No they have not. I was searching for the best price last night. Looks like Autohaus has them on sale for under $70 each.

I planned on having the wife help me check them this weekend.
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post #4 of 49 (permalink) Old 01-07-2010, 06:18 AM
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There are some pretty good pic threads here about the mounts. I think they look compressed when bad and new ones will lift the motor back up to its intended height when new. They would also show signs of leakage of the fluid contents on the outside of the mounts when bad. Not an expert but I believe this is correct. Anyone care to add to this opinion??

Good luck.

Jeff


<-----Oh look! I've hit 200+ posts! (Website Junky) :-)

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post #5 of 49 (permalink) Old 01-07-2010, 06:22 AM Thread Starter
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I agree, but I am a little suspect that they are the mounts. I was going to replace them "just because". I have replaced about every other replaceable part on this vehicle. The reason why I am suspect is because the "stealer" would have/should have identified them recently the last time I took it in for the vibration. I could take it in for one small item and they give me a laundry list of other items to "think" about. I am only assuming the technician would have thunk that perhaps the mounts needed replacing and checked them out, but that is only an assumption.

Last edited by uttom; 01-07-2010 at 06:26 AM.
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post #6 of 49 (permalink) Old 01-07-2010, 12:04 PM
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basic ignition and fuel system maintenance items should be next on your check list if a rough idle persists. condition of spark plugs, fuel filter, fuel injectors. Do use OEM parts when replacing these items, you do get what you pay for.

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post #7 of 49 (permalink) Old 01-07-2010, 12:57 PM Thread Starter
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New plugs, wires, oil filter (dealer) and fuel filter all in the last 5,000 miles. All from Autohaus. 2 cans of sea foam.
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post #8 of 49 (permalink) Old 01-07-2010, 01:07 PM
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As common a problem as vibration at idle is on here, I'd suspect mounts too. Some people have described it as a slight miss instead. As to why your dealer tech could have missed such an obvious solution is beyond me. Please post back with a progress report. Good luck.

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post #9 of 49 (permalink) Old 01-07-2010, 01:12 PM
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I have an idle engine miss also, 2001 E430 with just over 120K. I noticed mine about 2 or 3 months ago but after a few weeks of accepting it I finally one day drove the piss out of it, after I installed new NGK plugs, and it subisided to a degree. Its back now. I did not replace my plug wires. My mounts have never been replaced that I know. Some in here say that 100K is about right for them to be replaced. Also my car is now 9 years old. So I will just keep replacing items on my list too. Plugs were done, oil changed, and a can of SeaFoam in the gas tank.

I would assume that the SeaFoam would clean the injectors and fuel delivery system. But maybe not. The car accelerates very well now with the new plugs and the hesitation it had before is now gone. But the intermittent idle miss is causing me frustration.

Maybe its time to get that 2006 CLS-550 I so dearly want and desire! Only problem is I cant afford a $600.00 a month car payment.....

Jeff
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post #10 of 49 (permalink) Old 01-07-2010, 01:47 PM
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12 years and 130k on the mounts?
Start with suggested mounts and than go farther from there.
I give it 95% the problem will end right after mounts replacement.
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