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  #1  
Old 03-21-2010, 11:42 AM
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Intermittent Rough Idle?

I've been experiencing some intermittent rough idling. I noticed it first yesterday on my way to a friend's house after being dyno'd. I did, just a few days ago, install NGK Iridium IX's (ZFR6AP-11) 1-step colder plugs only a few days ago however I haven't had any idling problems until now.

I don't know if dynoing it (taking the car to the top of 4th gear for the first time ever) had something to do with exasperating an underlying/existing problem but I certainly notice it now.

The RPMs at idle usually sit around 690-700, however sometimes it starts to dip and bounce back and forth between the high 500's and 700- until, after several seconds it levels itself out. If I wait long enough it'll happen again.

I took a short clip with my iPhone with it occurring:
http://www.gmelliottvideo.com/roughidle.MOV


I'm assuming this is directly related to my recent plug install after MS1 went in. I read that some didn't run right with ZFR's and went with the BKR6EIX with better results. Would there be any reason for the ZFR's to be causing this? Maybe I damaged one or more of them gapping them- we really didn't have good tools to do it.
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2008 Dodge Caliber SRT4
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  #2  
Old 03-21-2010, 12:11 PM
Blast Wagon Blast Wagon is offline
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Quote:
Originally Posted by SRT6 View Post
I've been experiencing some intermittent rough idling. I noticed it first yesterday on my way to a friend's house after being dyno'd. I did, just a few days ago, install NGK Iridium IX's (ZFR6AP-11) 1-step colder plugs only a few days ago however I haven't had any idling problems until now.

I don't know if dynoing it (taking the car to the top of 4th gear for the first time ever) had something to do with exasperating an underlying/existing problem but I certainly notice it now.

The RPMs at idle usually sit around 690-700, however sometimes it starts to dip and bounce back and forth between the high 500's and 700- until, after several seconds it levels itself out. If I wait long enough it'll happen again.

I took a short clip with my iPhone with it occurring:
http://www.gmelliottvideo.com/roughidle.MOV


I'm assuming this is directly related to my recent plug install after MS1 went in. I read that some didn't run right with ZFR's and went with the BKR6EIX with better results. Would there be any reason for the ZFR's to be causing this? Maybe I damaged one or more of them gapping them- we really didn't have good tools to do it.
Did you reset your pcm after installing the spark plugs?
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Last edited by Blast Wagon; 03-21-2010 at 12:45 PM.
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Old 03-21-2010, 01:18 PM
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As in remove the battery? No- I'll give it a try though. How long should the negative be left off for the ECU to "reset"?

PS That video should be up shortly- just finishing cutting it!
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Old 03-21-2010, 01:34 PM
Blast Wagon Blast Wagon is offline
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Quote:
Originally Posted by SRT6 View Post
As in remove the battery? No- I'll give it a try though. How long should the negative be left off for the ECU to "reset"?

PS That video should be up shortly- just finishing cutting it!
Thanks.....I would try 10 mins or so. I could not hear it at all. Maybe its my laptop but I got very low volume. I understand the stock plugs by design add more timing than the bkrs. Your pcm may have been compensating. Its just a guess.

Were you still at the dyno when my clutch took a dump? That was so disappointing. I'll tell you, the mechanic was getting real excited when we started seeing better numbers. I guess he wasnt expecting it and then again, neither was I.
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Old 03-21-2010, 02:04 PM
Blast Wagon Blast Wagon is offline
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You could also put the stock ecu back in and see if your problem still exists. Then, put the S1 back in. That resets the ecm and at the same time, you verify if its the ecm or some other problem.
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Old 03-21-2010, 02:08 PM
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it the drive by wire, mine does it as well.
after a 10 mile trip on the high way i let it idle the rpms jump up and down. mine did this after the ms1 install
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Old 03-21-2010, 03:22 PM
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So you only notice this after driving for a while (ie after it's hot)? When I felt it, it was indeed after some highway time.
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Old 03-21-2010, 03:27 PM
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Idk if it helps at all(coming from a non srt owner) but mine will also do that, but not as much. It will dip so low it seems like its going to die, and then flutters for a minute, and then everything is a-ok.

One thing is for sure, all this computer controlled, electronic garbage, is well... garbage..
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Last edited by 08sunburst; 03-21-2010 at 04:39 PM.
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Old 03-21-2010, 04:20 PM
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Same here. I get the same dip in my idle. I find it normal with this car
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Old 03-21-2010, 05:07 PM
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mine does this as well and i was freaking out like you but seeing this post and everyone else car doing it as well i fill better
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