Intermittent missfire
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MBWorld Fanatic!
Joined: Jan 2009
Posts: 1,175
Likes: 101
From: Australia
09 C63
Intermittent missfire
Recently I have been having a intermittent missfire since I relplaced my o2 sensors. The car would start idling a little rough. Now and then it throws up a o2 sensor code, I clear the code and it starts running well again. How ever 2 things confuse me, previously when my o2 sensor failed it didn't effect the way the car idled. Also a weird code came up the other day P1614 - fuel control module fuel metering module. I changed the plugs, car was running great now it's come back again and my o2 sensor code is popping up again. Main issue is it's idling rough and on cruise has a little hesitation. Also when this happens it runs rich. Anything I should get the dealership to look at or look for?
Thanks
h
Thanks
h
Thread Starter
MBWorld Fanatic!
Joined: Jan 2009
Posts: 1,175
Likes: 101
From: Australia
09 C63
Replaced both o2 sensors about 1000kms ago. Tune is MHP. I honestly don't believe it's the tune because under WOT the car still rips! I have had a previous fuel issue which I addressed.
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Thread Starter
MBWorld Fanatic!
Joined: Jan 2009
Posts: 1,175
Likes: 101
From: Australia
09 C63
Ok so that code p1614 came up again. It's something to do with the fuel system. No idea which part, then I got hit with a missfire in cyl 1 and 4. Cleared codes drove it straight to my dealer, should have some news tomorrow. Could be bad fuel again, hope not.
Thread Starter
MBWorld Fanatic!
Joined: Jan 2009
Posts: 1,175
Likes: 101
From: Australia
09 C63
Spark plugs changed less then 200kms ago and def not them. The car was running mint and hammering! This just happened yesterday and today.
Mthis, I don't think that will do anything as the car has been running perfect up until recently. No issues at all with it.
Mthis, I don't think that will do anything as the car has been running perfect up until recently. No issues at all with it.
Super Member
Joined: Nov 2010
Posts: 666
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From: Australia
2017 AMG C43
Remember the issues I had. 2 new fuel pumps and a new battery and till throwing codes, in the end I re flashed it back to stock and the problems went away. I am not suggesting that your tune isn't right but it is worth a try. I think sometimes the tunes give false codes. Send your ECU to Sonny, best thing I ever did.
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From: Central Florida
2013 Chevy 427 Torch Red
Multiple cylinder misfires in the same bank is most likely an o2 sensor issue. Funny how everyone that I have talked with who has dealt with this issue seems to have problems with 1-4?
Thread Starter
MBWorld Fanatic!
Joined: Jan 2009
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From: Australia
09 C63
Remember the issues I had. 2 new fuel pumps and a new battery and till throwing codes, in the end I re flashed it back to stock and the problems went away. I am not suggesting that your tune isn't right but it is worth a try. I think sometimes the tunes give false codes. Send your ECU to Sonny, best thing I ever did.
Hughes, I wonder why? My o2 sensor code says bank 1 sensor 1 from memory.
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Joined: Oct 2008
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From: Central Florida
2013 Chevy 427 Torch Red
Congrats!! My issue, documented in a different thread, had the same resolution. The codes don't simply say "up stream O2 sensor" but point at other afffected items. While I was having this problem, the plugs from that cylinder bank all fouled as well making the diagnosis even more difficult. Keith's MB ace noticed irratic voltage coming from the problem sensor even though it was telling the computer all was fine. Once replaced I have not had a problem since.
PS: My car had gotten to the point where it was not drivable so this is not just a convenience issue.
PS: My car had gotten to the point where it was not drivable so this is not just a convenience issue.
Super Member
Joined: Jul 2009
Posts: 603
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From: Asheville, Atlanta
SL 65 AMG, Porsche 911 (993), 2014 Cayenne GTS, 2013 Toyota Highlander Limited
Similar problem
I had a very similar problem.......mine had to do with the ignition module (voltage transformer) that works with both ignition coil packs being bad and fouling plugs on the one side......dealership read the codes.......
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Joined: Sep 2022
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Mercedes s63 amg
Thread Starter
MBWorld Fanatic!
Joined: Jan 2009
Posts: 1,175
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From: Australia
09 C63
Hey bud couldn’t tell you
i was reading through this and i actually don’t remember any of it as it’s been so long
And my car has taken a completely different direction now
i was reading through this and i actually don’t remember any of it as it’s been so long
And my car has taken a completely different direction now
