really low idle
Thread Starter
Teching In
Joined: Oct 2010
Posts: 15
Likes: 0
From: oregon
really low idle accidentally posted this in the external section... so usually my idle is around 900 when cold and down to 600 when warmed up. lately though, last 2 days when cold started or even semi-cold it barely even runs, maybe 200 rpm and has even died once. idle seems to return to 5-600 once warm though... any thoughts why this might be?
On The Tree
Joined: Nov 2008
Posts: 104
Likes: 0
From: Mountain View, CA
I experienced the same thing when leaving work today. 300-400rpm, took several seconds to stabilize. Drove normal, but only idled normal after about a mile of driving. It's a 2000 SS Convertible M6, stock, with CA emissions 
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I had a strange low idle problem on my old LS1 car when I killed the battery once (using the car as a stereo at a cookout, lost track of time)...when I got the car to jump start, it couldn't hold an idle above 300-400 RPM to save itself, and that also wasn't enough RPM for the alternator to charge the battery...I had to take the car up and down the highway 20-30 miles to get a half decent charge into the battery, then it idled perfectly fine again.
So...it might be worth checking your battery and alternator and any grounds in the car, especially the ones for the PCM and the engine...all the sensors and the injectors and coils ground through them.
So...it might be worth checking your battery and alternator and any grounds in the car, especially the ones for the PCM and the engine...all the sensors and the injectors and coils ground through them.
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TECH Resident
Joined: Feb 2002
Posts: 843
Likes: 0
From: Roseville, Ca.
You have to do the "idle re-learn" procedure when the battery is disconnected or dies. Turn on the ignition for 5 seconds (don't start the car), turn off the ignition for 5 seconds, start the car.
I'm aware of that, however, it was dead to the point where I couldn't restart it, and it wanted to stall when I took the jump pack off unless I had it revving high enough for the alternator to charge...so I HAD to drive it first to charge the battery enough to do that. I forgot to mention that I did do that after driving it a bit. My mistake.
My car did this about a month or so ago. Would barely idle and sometimes wouldn't even start. Changed out my IAC and is now back to perfect. Here's the one I bought:
http://shop.advanceautoparts.com/web..._993335056____
Takes a whole 5 minutes to change, but takes a whole $130 outta the wallet, lol.
http://shop.advanceautoparts.com/web..._993335056____
Takes a whole 5 minutes to change, but takes a whole $130 outta the wallet, lol.
My car did this about a month or so ago. Would barely idle and sometimes wouldn't even start. Changed out my IAC and is now back to perfect. Here's the one I bought:
http://shop.advanceautoparts.com/web..._993335056____
Takes a whole 5 minutes to change, but takes a whole $130 outta the wallet, lol.
http://shop.advanceautoparts.com/web..._993335056____
Takes a whole 5 minutes to change, but takes a whole $130 outta the wallet, lol.
