Idle fluctuation question?
Burning Brakes
Joined: Oct 2006
Posts: 995
Likes: 2
From: Virginia Beach VA
Mine is too
Mine a mild cammed '05 6mn w/ the supporting bolt-ons. When I come to a light the idle hangs up in the 1300-1500rpm range & will settle back to 900rpm which where I had the tuner set it. I too thought leak, but my tuner said it's an easy fix by tuning. It also will get an intermittent CEL. Any input for a similiar problem? What about the CEL?
Melting Slicks
Joined: Jun 2003
Posts: 2,637
Likes: 0
From: Acton MA
Mine a mild cammed '05 6mn w/ the supporting bolt-ons. When I come to a light the idle hangs up in the 1300-1500rpm range & will settle back to 900rpm which where I had the tuner set it. I too thought leak, but my tuner said it's an easy fix by tuning. It also will get an intermittent CEL. Any input for a similiar problem? What about the CEL?
If you get the CEL code i could tell you what the issue is.
It could be anything from bad 02 sensor to a gas cap thats not tight enough.
Burning Brakes
Joined: Oct 2006
Posts: 995
Likes: 2
From: Virginia Beach VA
Thanks, but...
Adjusting min air flow would have to be done by a tuner, I personally don't have anything to tune the car or check codes. I guess that's more of a question? Is their something I can do & what about the possiblity of a leak?
Advanced
Joined: May 2008
Posts: 92
Likes: 0
From: Longmont Co
Well the weather here in Wyoming got quite cold and I have been really busy. I hadn't started my car in several weeks and went to start it a few nights ago and it was dead. Totally dead. I figured being an 05 it was about time for a new battery anyway so I went and bought an Optima red top dry cell battery. After installing it I started it and drove it to charge the battery fully. Shazaaam. Guess what. All idle problems are gone! It has no fluctuation, doesn't die, acts exactly as it is supposed too! I can't believe that is all it took to rectify the problem. Either the battery wasn't putting out enough juice to run the idle speed controller correctly or just unhooking the battery reset the parameters in the computer? One way or the other it is fixed and I am very happy. Figured I would share just in case this happens to someone else.
Russ
Safety Car
Joined: Dec 2005
Posts: 4,157
Likes: 37
From: North Carolina
St. Jude Donor '07-'08-'09-'11-'12
I have an idle question. When I am coming to a stop and push in my clutch sometimes my cars idle will fall down to a few hundred rpm's and then catch itself and rev back up and then fall and rev several times till it evens out at 650rpm when at normal operating temp. It doesn't do it every time so I am stumped? Car info is: 2005 C6 M6 w/ forged 402 stroker motor. Vararam, tb spacer, cnc ported and hand finished LS3 heads and intake, lg longtubes etc. I have put about 1500 miles on the engine now and would assume if the computer was going to adapt it would have by now. So what causes this? is it not getting enough idle air to compensate for the extra fuel injected in the motor? What is most confusing is that it does it erratically. One time it idles down and almost dies or does occasionally or it just acts normal? Any help would be appreciated......Craig
Pro
Joined: Jul 2006
Posts: 608
Likes: 1
From: LZ IL
Here is a lesson for all. Whenever your idle is acting up 2 steps.
1 carefully clean your MAF with brake cleaner. removes oil and road soot.
2 remove battery cable for a few mins then re connect. resets that small learning process. don't forget to turn everything off in the car before you start after reconnecting the batt. once the car has been running a few mins you can go ahead and re index the windows and set the clock.
This will solve 90% of those, it suddenly started idling funny guys.
1 carefully clean your MAF with brake cleaner. removes oil and road soot.
2 remove battery cable for a few mins then re connect. resets that small learning process. don't forget to turn everything off in the car before you start after reconnecting the batt. once the car has been running a few mins you can go ahead and re index the windows and set the clock.
This will solve 90% of those, it suddenly started idling funny guys.
Thread Starter
Instructor
Joined: Mar 2007
Posts: 223
Likes: 0
From: Casper WY
Craigster, haha yes the lunar cycle!! I have heard everything from it's normal because of the big cam to the tune, to air leaks etc. I didn't know that the cold weather would rectify the situation? I guess a denser colder charge couldn't hurt? Now I won't know if it's true till about May! I will probably be taking my car back in for more mods before then hopefully and can get the tune checked.
