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RPM needle bouncing up and down

     
Old Aug 12, 2013 | 03:16 PM
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allBlack
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C300 Sport
RPM needle bouncing up and down
2010 C300 Sport.

The RPM needle is going up and down while in drive or park ever so slightly. About .25k RPM or so (probably lower). It happens with A/C off or on. It's hard to see if unless you look for it but sometimes it moves up and down a lot.

Is this normal?
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Old Aug 12, 2013 | 03:38 PM
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Doa
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W205
no its not. had it with my previous car and it was the EGR vavle sensor
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Old Aug 12, 2013 | 04:25 PM
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C300 Sport
Originally Posted by Doa
no its not. had it with my previous car and it was the EGR vavle sensor
How did you find out it was the EGR valve sensor? Would the car give out a reading saying it was bad?

I haven't had any error messages or anything other than a TPMS once.
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Old Aug 12, 2013 | 11:32 PM
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Doa
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W205
i took the car to the dealer
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Old Aug 13, 2013 | 01:37 PM
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C300 Sport
Originally Posted by Doa
i took the car to the dealer
Did you have an error message that indicated what the problem was or did they just end up looking around the whole vehicle for a problem?

I don't have any error codes at the moment.
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Old Aug 13, 2013 | 01:59 PM
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Doa
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W205
nope had no fault message. was on a BMW 3 series
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Old Aug 14, 2013 | 08:55 PM
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C300 Sport
I took it in and they told me that it is normal due to the a/c compressor pulling in air. But problem is it happens even with A/C off.

Anybody have any insight?
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Old Jan 5, 2015 | 05:35 PM
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hhh818
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C350
Originally Posted by allBlack
I took it in and they told me that it is normal due to the a/c compressor pulling in air. But problem is it happens even with A/C off.

Anybody have any insight?

what happened to your rpm needle? did you get it fixed? same thing happening to mine.
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Old Jan 11, 2018 | 11:50 AM
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2012 C250
Originally Posted by hhh818
what happened to your rpm needle? did you get it fixed? same thing happening to mine.
Does anyone have an answer for this? If it's normal? My 2012 c250 rpm bounces ever so slightly on a cold start. It stops after it's kinda warmed up. But if I tried, I could feel the car shudder a bit with the needle. Should I bring this in? I have extended warranty.

I've experience extremely rough idle with my jag in the past but because it was never tuned up on time.
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Old Jan 11, 2018 | 01:19 PM
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2013 C250 Sport
I'm not sure on this car but it can often be the first sign of a vacuum leak on may cars.
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Old Jan 11, 2018 | 06:36 PM
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c300biceps
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2010 c300 4 matic sport
might be early signs of bad MAF sensor. my guess. it was the case with my buddy's c350.

good luck
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