For some reason, out of the blue, one day last week I noticed that my car developed a slightly rough idle. I was at a stop light and noticed I could feel it through the seat. As soon as I get the motor off idle, it smooths out and feels like normal. Car still runs like a top....just that rough idle. If y9u put your hand on the motor..you can feel a slight bobble/miss. It's usulally as smooth as butter at idle.
I started with the basics....pulled all the plugs and found a wet one. Great, leaky injector...that must be it. Replaced the injector, no change in the idle.
I then reset all the motor adaptations.....no change in the idle.
Scanned for codes just for the heck of it...nothing.
I ran a log trying to see if I could see anything...nothing. ARF's, STFTs, LPFP,HPFP, everything looks fine....so signs of anything odd.
I went ahead and put in all new plugs and coils (thanks FCP!).....still no change in the rough idle.
Checked for any leaking vacuum lines, or anything else odd under the hood. nothing. Valve cover is a new OEM one with around 6K miles on it. Valves were cleaned around 15K miles ago.
What's some other things that could cause a slightly rough idle? I'm out of ideas.
I started with the basics....pulled all the plugs and found a wet one. Great, leaky injector...that must be it. Replaced the injector, no change in the idle.
I then reset all the motor adaptations.....no change in the idle.
Scanned for codes just for the heck of it...nothing.
I ran a log trying to see if I could see anything...nothing. ARF's, STFTs, LPFP,HPFP, everything looks fine....so signs of anything odd.
I went ahead and put in all new plugs and coils (thanks FCP!).....still no change in the rough idle.
Checked for any leaking vacuum lines, or anything else odd under the hood. nothing. Valve cover is a new OEM one with around 6K miles on it. Valves were cleaned around 15K miles ago.
What's some other things that could cause a slightly rough idle? I'm out of ideas.