Engine shakes at idle...right after an oil change? - Mercedes-Benz Forum

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Old 04-23-2011, 07:00 AM   #1 (permalink)
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Engine shakes at idle...right after an oil change?

I'm new to the forum. And, well, new to cars again. Hadn't own one for a couple months. But bicycles are so high maintenance, thought I'd buy a few MBs instead.

Ok...for my first oil change, took it to a local Euro mechanic who also does a pretty thorough inspection/test drive to make sure the wheels aren't going to fall off and that there aren't unicorns poking holes in the exhaust and defecating in the filters.

No major problems. Sure, the rear axles look worn ($1812 fix...yikes...) and the front left tire has a little play in it ($600 for new upper arm and tie rod)...but, safe to drive for now.

I've only owned the car for a few days. No shaking at idle. Then, within a few hours of getting my oil changed...engine shakes at idle (starting the car, stop signs, stop lights, especially when attractive women are looking). Slip it into neutral and/or give it a little gas, shaking subsides.

1.) Coincidence? Or...related?

2.) Also, do you ever need to replace the engine mounts without needing to replace the engine shock/damper? What's the difference? And are either of those jobs DIY if I have a few jacks, tools, and can bench press like...100 lbs? I'm seeing that engine shock/damper kit is around...10x more expensive than engine mounts. But if they both need done, so be it.

Thanks for any help. I already love this forum. And power windows from the early 80s.
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Old 04-23-2011, 08:38 AM   #2 (permalink)
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Does it shake all the time, or just when at operating temps?

If the latter, you may need to adjust or replace the rack damper bolt/pin.
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Old 04-23-2011, 08:51 AM   #3 (permalink)
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The shaking at idle that clears up when you gas it a little could be your idle air distribution hoses. I had that exact symptom. Another part of the symptom is that when i opened the hood with the car running, you could hear the split hoses sucking air The hoses are thick and run along the valve covers and connect near each injector. There is also a hose that runs between the two along the VCs to connect them together. I think I paid about $150 for genuine MB parts and the install was pretty easy. It's a little tight getting the connecting hose under the fuel distributor but I got it done. Actually, I did it twice...fair warning, I bought cheap aftermarket hoses and they split within 1500 miles. Thats why I decided to go with the genuine MB parts. They were noticeably beefier.
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Old 04-23-2011, 09:22 AM   #4 (permalink)
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I believe he is talking about a 300SD, but, at any rate.

Buy good OEM rubber parts the after market, especially URO, parts do not last and it's a false savings because you have to replace them again in 6 months. BTDT and have the wallet scars to prove it.
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Old 04-23-2011, 10:02 AM   #5 (permalink)
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Only shakes when at a stop and idling. No shaking with any amount of gas and driving. I'll pop the hood next time I'm running the car and see if I hear split hoses sucking air.

I imagine it sounds like the ATM taking in my debit card and spitting out cash. That sound?

So if it is split hoses...I'm seeing that's a hard, but DIY job. But if it's engine mounts or shock absorbers...is that DIY?
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Old 04-24-2011, 05:52 AM   #6 (permalink)
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But does it shake when the engine is cold at idle?
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Old 04-24-2011, 09:17 AM   #7 (permalink)
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Is it Blackie or Goldie doing the shakes? Or both? The idle air hoses apply only to the gassers, BTW.

Sounds like a couple of potential issues. First, get the real MB motor mounts-- several times more expensive than aftermarket, but it's like the other folks said-- false savings. The engine shock do not have to be done at the same time. Do the mounts first. I'd also suggest you do the tranny mount at the same time. All of these are fairly straghtforward DIY. I think there is a pictorial around here somewhere. I'd also have a look at the service manual links in the "stickies' at the top of the forum page.

It's been a while since I worked in my diesel (still miss her, dammit), so I've probably forgotten things. This forum is excellent for finding just about everything you'll need. I might suggest a couple of other, similar groups/websites--

Diesel Discussion - PeachParts Mercedes ShopForum

The Unofficial MB Diesel DIY Pages

Mercedes Repair

The Car Maintenance Bibles
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Old 04-24-2011, 09:18 AM   #8 (permalink)
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An excellent question...it doesn't seem to shake at idle when cold...

I drove to church and back today, even by the time I got home (8 miles both ways) it hadn't begun shaking today.

Oh I hope it was an isolated incident. But, if after the engine warms up and the shake returns at idle..what do you suspect?
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Old 04-24-2011, 11:08 AM   #9 (permalink)
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Quote:
Originally Posted by Chadahar View Post
I believe he is talking about a 300SD, but, at any rate.

Buy good OEM rubber parts the after market, especially URO, parts do not last and it's a false savings because you have to replace them again in 6 months. BTDT and have the wallet scars to prove it.
oops! Got carried away with the symptoms and forgot about the engine.
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Old 04-24-2011, 01:43 PM   #10 (permalink)
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i gave up on my 90 560sel shake at idle... dropped at shop friday..
i replaced all the injector vacuum hoses, icv, fuel pump relay, and a few other things thought to be the idle shake after reached 80 c..............
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