Engine chokes at street lights - Mercedes-Benz Forum
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post #1 of 22 (permalink) Old 06-27-2019, 12:51 AM Thread Starter
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Question Engine chokes at street lights

It started a couple of days ago. The car engine starts and runs without issues.
The problem is: At low speed 25-30 km/h the engine chokes and the car feels rough and bouncy. It happens when stop and start at street lights. Once over 40 km/h it runs fine... but the car is not reliable now...

Any suggestions?

Thanks,
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post #2 of 22 (permalink) Old 06-27-2019, 01:38 AM
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Blocked cat may be .

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post #3 of 22 (permalink) Old 06-27-2019, 04:28 AM
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Any codes? Manual or automatic transmission? If auto, does it downshift when slowing down to a stop? How does it idle when fully warmed up while parked?

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post #4 of 22 (permalink) Old 06-27-2019, 09:11 AM Thread Starter
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Originally Posted by pfsantos View Post
Any codes? Manual or automatic transmission? If auto, does it downshift when slowing down to a stop? How does it idle when fully warmed up while parked?
No codes displayed. Nothing.
Automatic transmission.
Yes it does downshift. No issue. (it might be just my imagination "when slowing down to a stop" is not exactly as smooth as it used to be. Maybe it's only me that can feel it... Maybe just imagination)
Idle is fine. No issues.

Thanks,
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post #5 of 22 (permalink) Old 06-27-2019, 09:17 AM Thread Starter
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Not sure what a "Blocked cat" means...
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post #6 of 22 (permalink) Old 06-27-2019, 09:28 AM
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Originally Posted by mark0n View Post
No codes displayed. Nothing.
Automatic transmission.
Yes it does downshift. No issue. (it might be just my imagination "when slowing down to a stop" is not exactly as smooth as it used to be. Maybe it's only me that can feel it... Maybe just imagination)
Idle is fine. No issues.

Thanks,
More than a few owners on this forum have this issue. I have had it for a while now. My mechanic thinks it is the spark plug wires. They are tiny misfires and barely felt but at low speeds, usually idling at a light, you can feel them. The needle bounces ever so slightly. I'm getting my plug wires changed mid July. Will report on if it fixes the issue. They are expensive because of the 90 degree bend at the end, and they are heat shielded wires. They cost more than a set for a V8 S class and getting to these plugs are a real b*tch. Oh, I have a turbo BTW.
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post #7 of 22 (permalink) Old 06-27-2019, 10:12 AM
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Originally Posted by mark0n View Post
Not sure what a "Blocked cat" means...
It refers to a "blocked up" catalytic converter..meaning that there is a restriction in the exhaust system and the fumes can't get out of the tile pipe easily....ie: if you ram a potato into the tailpipe, you block the exhaust fumes from exiting...and your car will stall...

Your catalytic converter is a filter with fine holes and fine passageways .. if the holes block up (a lot..) and the car will want to stall.
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post #8 of 22 (permalink) Old 06-27-2019, 10:16 AM
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................ They are expensive because of the 90 degree bend at the end, and they are heat shielded wires. They cost more than a set for a V8 S class and getting to these plugs are a real b*tch. Oh, I have a turbo BTW.............
The non turbo B's (B200's..etc..) have a straight plug wire,..and they remove with a straight pull or push...not bad at all..
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post #9 of 22 (permalink) Old 06-27-2019, 10:39 AM
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Next time when no one's behind and you see a red light up ahead, shift to Neutral, and come to a stop like you always do. Let us know if anything changes, just to rule out stalling due to the transmission slowing down the engine too much or downshifting too late.

Just to exclude it from possible causes.

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post #10 of 22 (permalink) Old 06-30-2019, 09:55 AM Thread Starter
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Quote:
Originally Posted by pfsantos View Post
Next time when no one's behind and you see a red light up ahead, shift to Neutral, and come to a stop like you always do. Let us know if anything changes, just to rule out stalling due to the transmission slowing down the engine too much or downshifting too late.

Just to exclude it from possible causes.
Done / tested this several times. No issues. Smooth, normal stop on Neutral.
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