Slight tremble/hiccup on idle
Thread Starter
Newbie
Joined: Nov 2014
Posts: 5
Likes: 0
2008 Mercedes C350
Slight tremble/hiccup on idle
Hi everyone,
I have a 2008 Mercedes C350 (150k miles) and today while I was at a stop light my car started having some very slight hiccups. And it kept on doing it every time I would get to a complete stop. It's a small tremble for one second and it seems pretty regular (each 3-5 seconds). The RPM needle (I don't know the exact term for it) doesn't move at all during this tremble. It stays where usually is 550-600.
It does the same thing on Neutral, Reverse or parking.
I came home and I cleaned the throttle body and the maf sensor. I drove it for another 10 minutes and then again the same problem.
So far I didn't get the CEL on so I can't test to see what's going on.
Does any of you have any ideas what else should I check?
Thank you
I have a 2008 Mercedes C350 (150k miles) and today while I was at a stop light my car started having some very slight hiccups. And it kept on doing it every time I would get to a complete stop. It's a small tremble for one second and it seems pretty regular (each 3-5 seconds). The RPM needle (I don't know the exact term for it) doesn't move at all during this tremble. It stays where usually is 550-600.
It does the same thing on Neutral, Reverse or parking.
I came home and I cleaned the throttle body and the maf sensor. I drove it for another 10 minutes and then again the same problem.
So far I didn't get the CEL on so I can't test to see what's going on.
Does any of you have any ideas what else should I check?
Thank you
Super Member
Joined: Apr 2010
Posts: 705
Likes: 55
From: LA LA Land
'08 C300 MM Pano
At 150k miles, and without looking at what's been done to the car (maintenance wise) it would be near impossible to tell without a CEL setting you off in one direction or another.
It could be spark plugs, ignition coils;
It could be fuel filter;
It could be fuel injectors;
Based on your statement about it doing the same in D, P, N and while brakes are on/off, I would not assume a vacuum leak nor would I have done anything to the MAF sensor.
Some DTC codes require more than one trigger to show up as "current" rather than "pending" (examples: all misfire codes, Lean/Rich condition codes, most engine performance codes for that matter).... So if you have access to a OBD-II code reader, get a quick scan to see if any codes are pending.
It could be something as strange sounding as a bad tank of gas... Keep an eye on it, wait for a CEL but hope for none... And may be it'll go back to normal soon.
It could be spark plugs, ignition coils;
It could be fuel filter;
It could be fuel injectors;
Based on your statement about it doing the same in D, P, N and while brakes are on/off, I would not assume a vacuum leak nor would I have done anything to the MAF sensor.
Some DTC codes require more than one trigger to show up as "current" rather than "pending" (examples: all misfire codes, Lean/Rich condition codes, most engine performance codes for that matter).... So if you have access to a OBD-II code reader, get a quick scan to see if any codes are pending.
It could be something as strange sounding as a bad tank of gas... Keep an eye on it, wait for a CEL but hope for none... And may be it'll go back to normal soon.
Thread Starter
Newbie
Joined: Nov 2014
Posts: 5
Likes: 0
2008 Mercedes C350
At 150k miles, and without looking at what's been done to the car (maintenance wise) it would be near impossible to tell without a CEL setting you off in one direction or another.
It could be spark plugs, ignition coils;
It could be fuel filter;
It could be fuel injectors;
Based on your statement about it doing the same in D, P, N and while brakes are on/off, I would not assume a vacuum leak nor would I have done anything to the MAF sensor.
Some DTC codes require more than one trigger to show up as "current" rather than "pending" (examples: all misfire codes, Lean/Rich condition codes, most engine performance codes for that matter).... So if you have access to a OBD-II code reader, get a quick scan to see if any codes are pending.
It could be something as strange sounding as a bad tank of gas... Keep an eye on it, wait for a CEL but hope for none... And may be it'll go back to normal soon.
It could be spark plugs, ignition coils;
It could be fuel filter;
It could be fuel injectors;
Based on your statement about it doing the same in D, P, N and while brakes are on/off, I would not assume a vacuum leak nor would I have done anything to the MAF sensor.
Some DTC codes require more than one trigger to show up as "current" rather than "pending" (examples: all misfire codes, Lean/Rich condition codes, most engine performance codes for that matter).... So if you have access to a OBD-II code reader, get a quick scan to see if any codes are pending.
It could be something as strange sounding as a bad tank of gas... Keep an eye on it, wait for a CEL but hope for none... And may be it'll go back to normal soon.
If anyone can point any DIY I would gladly appreciate.
Also worth checking the evap system purge control valve to see if it's opening and shutting properly. A malfunctioning one can cause idle issues
MBWorld Fanatic!
Joined: Apr 2015
Posts: 1,739
Likes: 120
From: London ON Canada
2012 C300 4Matic Sport Sedan
i think this is it hope you can see it or just google it mbworld fuel filter diy
https://mbworld.org/forums/c-class-w...ic-2013-a.html
the link is in this thread
Last edited by MB Marko; Feb 21, 2016 at 04:16 PM.
Thread Starter
Newbie
Joined: Nov 2014
Posts: 5
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2008 Mercedes C350
Later edit:
I found the DIY for changing the fuel filter. I'm going to do this right now.
Last edited by dvdalx; Feb 21, 2016 at 04:39 PM. Reason: I found the DIY for changing the fuel filter.
Thread Starter
Newbie
Joined: Nov 2014
Posts: 5
Likes: 0
2008 Mercedes C350
Is it possible that this model doesn't have the fuel filter attached below?
http://www.napaonline.com/napa/en/p/FIL3643_0183440579
I opened the car underneath and have not found the fuel filter.
http://www.napaonline.com/napa/en/p/FIL3643_0183440579
I opened the car underneath and have not found the fuel filter.
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MBWorld Fanatic!
Joined: Apr 2015
Posts: 1,739
Likes: 120
From: London ON Canada
2012 C300 4Matic Sport Sedan
https://mbworld.org/forums/c-class-w...8-c-300-a.html check this out read the last post maybe someone with a 2008 who has done this will chime in
Last edited by MB Marko; Feb 21, 2016 at 07:58 PM.
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Junior Member
Joined: May 2020
Posts: 55
Likes: 9
2012 Mercedes C63 amg
I know this is an old thread but did you end up figuring out what caused your hiccups? My 2016 amg gts is having the same symptoms, where its having slight intermittent hiccups at idle in comfort mode. No CEL nor any movement in rpm needle. Comes every 3-5 seconds.
