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Old June 20th, 2014, 05:26 PM   #1
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v6 idle rough on start up

Since I put my PCD's and exhaust on over a year ago I have noticed that my car has been idling rough on start up. Once it warms up it goes away. Almost sounds like its got cam's. Anyone else have this happening to them? Today it actually through codes. Saying that it was misfiring on all cylinders when I started it up. But like I said after a couple minutes it goes to idling normal and it runs fine.
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Old June 20th, 2014, 05:38 PM   #2
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Since I put my PCD's and exhaust on over a year ago I have noticed that my car has been idling rough on start up. Once it warms up it goes away. Almost sounds like its got cam's. Anyone else have this happening to them? Today it actually through codes. Saying that it was misfiring on all cylinders when I started it up. But like I said after a couple minutes it goes to idling normal and it runs fine.
It is normal. The motors actually misfire themselves to heat the cats up quicker. The thickness of the metal of the stock exhaust components and the cats keep all of this quiet. The codes are not a normal part of it, though
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Old June 20th, 2014, 06:01 PM   #3
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Hmm. This is the only time it came on. If it happens again any idea on what it could be?
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Old June 20th, 2014, 06:11 PM   #4
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I've read in various threads that it could be valves needing adjustment or bad coils.
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Old June 20th, 2014, 07:15 PM   #5
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I've read in various threads that it could be valves needing adjustment or bad coils.
This.

Car had one valve far enough off that it sounded like a Harley before a valve tune. After it diminished. However with MDX cams it does still sound a bit odd.
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Old June 20th, 2014, 08:44 PM   #6
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But was it just on start up? It runs and sounds normal after a couple minutes.




Quote:
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This.

Car had one valve far enough off that it sounded like a Harley before a valve tune. After it diminished. However with MDX cams it does still sound a bit odd.
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Old June 20th, 2014, 09:30 PM   #7
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pretty normal after warmup, until I gas it then it goes back to sewing machine until cruising at which point its silent.
Scary silent too. I'm also using 20wt race oil Redline in 120* heat.
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Old July 4th, 2014, 03:26 PM   #8
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v6 idle rough on start up

Mine does the same thing except it doesn't code. I love it

Last edited by Ryguy1992; July 4th, 2014 at 03:27 PM.. Reason: e
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Old July 9th, 2014, 12:12 AM   #9
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Hey yea I've got the same thing goin on. I'm gonna do a valve adjustment and check (maybe replace since I'm at 120k) all my coils.
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Old July 9th, 2014, 04:29 AM   #10
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Is it happening frequently? Mine just came on again yesterday.
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