slight needle fluctuation while idling. New parts installed.
Thread Starter
Newbie
Joined: Oct 2019
Posts: 7
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C250 2012
slight needle fluctuation while idling. New parts installed.
I just changed out my spark plugs and engine coils on my C250 2012 luxury. This is the first time this has been done as I bought the car used with 86000 miles. The reason I did this was because I got an error code for the 3rd cylinder so I decided to change them all out. I just started the engine and noticed a very slight shake at idle that dissipated quickly but then I noticed my rpm moving up and down +/- 30. Is this normal because I just installed new parts? Anything I should look out for?
Senior Member
Joined: Nov 2013
Posts: 428
Likes: 63
From: Auburn, GA
C250 2013
I just changed out my spark plugs and engine coils on my C250 2012 luxury. This is the first time this has been done as I bought the car used with 86000 miles. The reason I did this was because I got an error code for the 3rd cylinder so I decided to change them all out. I just started the engine and noticed a very slight shake at idle that dissipated quickly but then I noticed my rpm moving up and down +/- 30. Is this normal because I just installed new parts? Anything I should look out for?
Did you change your engine filter yet? I have used Liqui Molly injector clear and got good results.
Thread Starter
Newbie
Joined: Oct 2019
Posts: 7
Likes: 0
C250 2012
No, I have not. I see this has to be changed around every 40k miles and I doubt the previous owner did. However, I have also found in other places in this forum that the rpm needle moving is considered normal on these models...
I suppose I should go to the shop and have the codes run again and see if anything comes up.
Senior Member
Joined: Nov 2013
Posts: 428
Likes: 63
From: Auburn, GA
C250 2013
No, I have not. I see this has to be changed around every 40k miles and I doubt the previous owner did. However, I have also found in other places in this forum that the rpm needle moving is considered normal on these models...
I suppose I should go to the shop and have the codes run again and see if anything comes up.
I suppose I should go to the shop and have the codes run again and see if anything comes up.
Senior Member
Joined: Nov 2013
Posts: 428
Likes: 63
From: Auburn, GA
C250 2013
