Engine limiter?? - Mercedes Benz SLK Forum

SLK R170 General Discussion SLK 200, SLK 230K, SLK 320, SLK32 AMG

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#1 Old 11-29-2017
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Engine limiter??

I sat in my 320 today and slowly revved up (once it was warm) when I got to 4200 rpm there was a big shake. As I revved abit more it shook more, like a big misfire, the whole car wobbled, it almost felt like the engine tried to jump out of the car. Is this normal? Is it a rev limiter? Any ideas what would cause this please?
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#2 Old 11-29-2017
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Have your motor mounts and/or trans mount been checked or changed since new?


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#3 Old 11-29-2017
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If you are in P or N, it will limit the revs to ~4000. it's a safety feature.
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#4 Old 11-29-2017
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Originally Posted by jbanks15 View Post
Have your motor mounts and/or trans mount been checked or changed since new?
To be honest I wouldn't know, it has done 145000 miles and I do have lots of receipts but none for an engine or trans mount. Would this be a symptom I would get then? I have a Zafira with a front engine mount worn and I can feel the movement in that when I drive but this is like a big lurch, never felt one like this before. Maybe it's because it's a bigger engine so it jerks more than my Zafira?
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#5 Old 11-29-2017
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If you are in P or N, it will limit the revs to ~4000. it's a safety feature.
Mine is a manual and it's while it's in neutral parked on my driveway. I hope it's that then.
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https://www.yourmechanic.com/article...g-engine-mount



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does it rev normally when accelerating?

how about with the clutch pedal pushed in or out?

my guess is it knows when you are sitting still. and of course, as others are saying - if your worried about the shaking part of it, then you might have worn mounts.
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#8 Old 11-29-2017
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Thanks for the replies, I will check it out tomorrow when there's more light and see if I can see any engine movement, hopefully it is just a mount which is nice and easy to change and nothing more serious thanks again I appreciate your input.
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