S500 mild stalling when idling - Mercedes-Benz Forum
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#1 (permalink) Old 09-30-2011, 10:39 AM
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S500 mild stalling when idling

I bought a 2001 RHD S500 about 6 months ago. It has done 110,000km but the car condition is good. The previous owner was a rich old guy and sent the car back to dealer for fixing whenever there was a problem.

Lately I feel the car is stalling mildly when idling in P or D transmission mode. It's not rattling seriously like the MAF is dead but it happens every 5 or 10 seconds. It may be a problem for long time but I just didn't aware of the stalling before.

2 months ago the CEL was on and diagnosis showed P0410 related with the secondary air injection pump. It was however in perfect condition and turned out it was the worn vacuum hoses connecting with the change over valve. I replaced most of the vacuum hoses beside the pump, erased the code and the CEL doesn't come back for almost 2 weeks. I therefore assume the vacuum lines are ok now. I've also changed the engine mounts and transmission mount when I bought the car 6 months ago. I'm thinking now if it would relate with CPS, O2 sensors and something else or it just needs a fuel injector clean.

Is there anyone have similar experience before and get resolved? Any suggestion would be very much appreciated.
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#2 (permalink) Old 09-30-2011, 10:40 AM
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should be 2002 S500
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#3 (permalink) Old 09-30-2011, 11:11 AM
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I can't relate to your description of "mildly stalling". Would a better description be a rough idle? It could be as simple as the spark plugs need changing.
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#4 (permalink) Old 09-30-2011, 11:31 AM
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I can't say it's a rough idle as it only shake once every 5 or 10 seconds but the rev needle doesn't move. It just shakes very very gently. Is it normal to Mercedes V8 engines.

I've already changed all 16 spark plugs. No malfunction shows up at onboard computer.
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#5 (permalink) Old 09-30-2011, 12:41 PM
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Is it more noticeable in gear and virtually gone in park? That might be sacked motor mounts. A bad plug wire could do that, and it wouldn't necessarily trigger a code. You can test them with an ohmmeter and replace just the bad ones (assuming you find any). A flaky MAF sensor could also account for that.

Good luck.

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#6 (permalink) Old 10-01-2011, 07:27 AM
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I'm still confused with the symptoms. When it hits one (for lack of a better discription) of these stumbles, does it sound like it is a single missed ignition or does it continue to stumble for a few seconds? It could be something as simple as an "italian" tune-up being needed. Otherwise, I would tend to agree with Check Codes.
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#7 (permalink) Old 10-01-2011, 10:49 AM
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I'd say the shaking is very very minor but it happens frequently. I'm guessing the MAF now even the rpm rev was pretty stable. Anyway, I will borrow the carsoft 7.4 from my friend and check if there are any stored codes this weekend.

I just start to think if I'm too sensitive as I am comparing with idling condition with my uncle's Lexus LS600HL? The engine in Lexus was actually off when idle so I can feel nothing. Will you guys be able to feel the engine running? How can you feel the engine is running? The answer may help me to understand if I'm too sensitive...Thanks a lot.
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#8 (permalink) Old 10-02-2011, 01:02 AM
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mine too

My 2000 S500 does the exact same thing, don't see it on the RPM needle but I can definitely feel it. I don't think it's an actual miss though, at least not compared to cars I KNEW had a definite miss. I'm not worried about it for now. could be one of the 16 spark plugs in my car, not sure when they were changed last and I have 140,000 miles on it.

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#9 (permalink) Old 10-02-2011, 01:10 AM
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AC compressor cycling?

vw phaeton. when vw copies mercedes, but forces you to service it next to golfs and jettas
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#10 (permalink) Old 10-04-2011, 07:47 AM
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I would have to concur with plug wires as a probable cause. Given the age of them (10 yrs) and the probability that they have not been changed, they have been known to cause stumbling and hesitation issues when they start to fail.
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