RPM needle bouncing up and down - MBWorld.org Forums

Aug 12, 2013 | 03:16 PM

allBlack

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Newbie

Joined: Jul 2013

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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?

Aug 12, 2013 | 03:38 PM

Doa

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Joined: Apr 2013

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From: Belgium

W205

no its not. had it with my previous car and it was the EGR vavle sensor

Aug 12, 2013 | 04:25 PM

allBlack

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Joined: Jul 2013

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C300 Sport

Quote:

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.

Aug 12, 2013 | 11:32 PM

Doa

MBWorld Fanatic!

Joined: Apr 2013

Posts: 1,130

Likes: 101

From: Belgium

W205

i took the car to the dealer

Aug 13, 2013 | 01:37 PM

allBlack

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Joined: Jul 2013

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C300 Sport

Quote:

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.

Aug 13, 2013 | 01:59 PM

Doa

MBWorld Fanatic!

Joined: Apr 2013

Posts: 1,130

Likes: 101

From: Belgium

W205

nope had no fault message. was on a BMW 3 series

Aug 14, 2013 | 08:55 PM

allBlack

Thread Starter

Newbie

Joined: Jul 2013

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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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Jan 5, 2015 | 05:35 PM

hhh818

Junior Member

Joined: Nov 2011

Posts: 34

Likes: 0

C350

Quote:

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.

Jan 11, 2018 | 11:50 AM

Karl-Benz

Newbie

Joined: Dec 2017

Posts: 11

Likes: 0

2012 C250

Quote:

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.