Misfire at 2000rpm (no CEL)

[Eric]

I have a "constant" misfire at around 2000 rpm (cruising) and the engine will stumble a bit as the rpm passes through 2000 rpm on acceleration. The stumble has been occasional since new. The "constant" misfire is new. This is with the Track Key. No CEL.

I did read through the sticky above. Common themes appear to be crank sensor and plug and TSB 13-6-15. Thoughts?

r/
Eric

 

[Eric]

Update...ran the the silver key for 5 min at idle (cam zero position relearn) and then restarted with the red key. The misfire is gone. Never did get a CEL. Seems ok now.

 

[VoodooBoss]

You can reset your PCM by either disconnecting your battery for 10+ minutes or crossing the red and black cables. I prefer disconnecting the ground wire myself. I've done this a couple of times now when my car starting running a big rough and that fixed it.

 

[Bossy1908]

Update...ran the the silver key for 5 min at idle (cam zero position relearn) and then restarted with the red key. The misfire is gone. Never did get a CEL. Seems ok now.

Glad the misfire is gone, but is the constant stumble still there? I have the exact same issue with my car since it was new. I've done the battery disconnect for 10 mins and really didn't notice much.

 

[Eric]

Disconnecting the battery didn't change much for me either. Doing the cam zero position re-learn (5 min idle with silver key) was a noticeable difference. The stumble wasn't there afterwards and the misfire was gone.

I do wonder if we are getting quality gas these days as they switch from winter to summer blends from different refineries. I originally attributed the stumble to gas since it was intermittent. When the low rpm misfire appeared, that was something different....and it was only with the red key.

 

[Bossy1908]

Disconnecting the battery didn't change much for me either. Doing the cam zero position re-learn (5 min idle with silver key) was a noticeable difference. The stumble wasn't there afterwards and the misfire was gone.


Would it make sense to do the cam zero position re-learn on a vehicle that hasnt had trackey intalled? I' ve yet to install trackey. This may be a stupid question, but how do you do the cam zero position re-learn? Is it literally just starting up your car with the silver key and letting it idle for 5 minutes?

 

[Eric]

Not sure since you don't have the TK installed. The TK instructions discuss the cam zero position relearn.

Have you tried disconnecting the battery for 10+ minutes and then idle it for 5 min (no accessories on, don't touch the throttle)? Might be a trip to the dealer....I see you have a 2012, believe TSB 13-6-15 applies.

r/
Eric