Idle “hiccup” - Mercedes-Benz Forum
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post #1 of 3 (permalink) Old 04-20-2019, 11:35 AM Thread Starter
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Date registered: Aug 2009
Vehicle: 1981 380SL
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Idle “hiccup”

Can’t think of a better way to describe it, but when the car is idling at a stop, for a split second the revs will drop very slightly, and the rear end of the car will jump up just a hair. Very intermittent. Sometimes I notice this under heavy acceleration, but the effect is that when it “hiccups”, you lose a bit of power. It’s REALLY irritating, and I’ve had this issue since day one, presumably.

It idles just fine otherwise. Some days it runs perfectly, without a single one of these incidents, other days it will do it once or twice and some days it’s really noticeable.

Changed all the plug wires after I did the timing chain, and that seemed to help a little, but I’m sure it’s all in my head.

Injectors are original, around 80k miles on them. Dump Techron in every once and awhile and can’t say I notice a difference. Stumped!
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post #2 of 3 (permalink) Old 04-21-2019, 07:43 AM
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Date registered: Apr 2009
Vehicle: 1985 500SL. Previous cars-190SL, 230S, 250SE, (2) 300SDs
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I have had this trouble. Found out it was a bad fuel injector.
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post #3 of 3 (permalink) Old 04-22-2019, 06:02 AM
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Yeah, when mine does that I know it is time to take it for a run at speed.
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