12-31-2013, 11:10 AM | #1 |
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Random misfire?
Getting a CEL with random misfire and misfire on cylinder 2 and 6. My SA suggested I swap coilpacks with 1 and 4 and see if that changes the misfire. And a friend suggested it could be the knock sensor plug/wire from when I had a cat replaced a few weeks back. I cleared the code once two weeks ago and it came back today with another random misfire code. Anyone else got any other ideas or has this happened to you in cold weather? It's not running weird and I don't hear anything strange. No loss of power or any other indications of a problem. Btw this is on an LLT.
Thanks y'all!
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2011 Custom LT/RS: Bella's Build Thread |
12-31-2013, 11:38 AM | #2 |
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Try the coil packs and spark plugs and see if it helps, if that doesn't help it go away than try getting fuel system and injector cleaner hooked up to your fuel lines to see if maybe it's just gunked up. If that doesn't work than you may have to open her up and check your timing chains. Thing that worried me is that you have two cylinders doing it and not just one. Usually one means spark plug and coil
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12-31-2013, 11:40 AM | #3 |
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This just happened to a customer that brought his cts into service. Was only cylinder 4 and we changed his spark plug and coil and was good as new.
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2013 ZL1 M6 - Mods-in the works
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12-31-2013, 11:51 AM | #4 |
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mentioned this on the V6 LLT forum aswell but run dry gas and injector cleaner through it before anything else took mine 3 days to clear same two cylinder misfires like the other guy said gunked up probably because of the moisture from the fuel blend change. BTW Ethanol sucks so much in our cars for this.
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12-31-2013, 11:59 AM | #5 |
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If you have a ported intake manifold, make sure the filler is in one piece and not inside the runners.
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12-31-2013, 12:40 PM | #6 |
They see me trollin'...
Drives: 217 ci of fury; Chauffeured by SS Join Date: Jul 2011
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Alright I grabbed some of this. Will run it through and see if the code comes back since we cleared it. If the code comes back will swap coilpacks and check knock sensor plug/bolt.
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2011 Custom LT/RS: Bella's Build Thread |
12-31-2013, 12:43 PM | #7 |
Drives: 2013 Blue Ray 1LS M6 Join Date: Apr 2013
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Good luck! Keep us informed.
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12-31-2013, 12:43 PM | #8 |
They see me trollin'...
Drives: 217 ci of fury; Chauffeured by SS Join Date: Jul 2011
Location: Oklahoma
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When the light came back on today it didn't show 2 and 6. Just random misfire.
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2011 Custom LT/RS: Bella's Build Thread |
12-31-2013, 12:50 PM | #9 |
They see me trollin'...
Drives: 217 ci of fury; Chauffeured by SS Join Date: Jul 2011
Location: Oklahoma
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I'm really thinking the gunk and moisture from fuel is a possibility. The car has 90k miles on it and I've only run seafoam through it twice and it was a long time ago. Gotta start maintaining now that she's aging.
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12-31-2013, 12:54 PM | #10 |
Drives: 2013 Blue Ray 1LS M6 Join Date: Apr 2013
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12-31-2013, 01:02 PM | #11 |
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I have had the same thing happen to me, I have 60,000 miles on mine. With some research, I found out that my K& N CAI, was fouling my MAF sensor. This was then causing this CEL. I got some MAF cleaner and sprayed my sensor and it has taken care of it. Because the air filter has oil on it, the oil gets on the sensor causing the fouling. Performance hasn't been effected, just that annoy CEL.
http://youtu.be/aJLNQcFosSo Last edited by =Stephens=; 12-31-2013 at 01:21 PM. |
12-31-2013, 01:07 PM | #12 |
They see me trollin'...
Drives: 217 ci of fury; Chauffeured by SS Join Date: Jul 2011
Location: Oklahoma
Posts: 13,876
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I may spray the MAF with cleaner too. I have noticed a reduction in my gas mileage lately too; more than the usual drop with winter fuel blend.
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"Never race anything you can't afford to light on fire and push off a cliff." -CamaroSpike
2011 Custom LT/RS: Bella's Build Thread |
12-31-2013, 01:23 PM | #13 |
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That is probably your foot hammering the gas because it's so much fun to drive fast. That seems to be my problem lately.
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12-31-2013, 01:47 PM | #14 |
Drives: 2013 Blue Ray 1LS M6 Join Date: Apr 2013
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^ This
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