I have a 2004 I6 Trailblazer, 80xxx miles. About 6 months ago it decided it wanted to idle at 900 rpm.
When this first happened, I disconnected the battery for 1/2 hour, the idle came down to 600, I thought it was fixed. Well, since then it's happened several times, disconnected the battery, worked great for about 150-200 miles, then started all over again. Once in a while it will return to 600 rpm on it's own.
It doesn't matter if the A/C is on or off.
I checked for codes with a scanner, there are none. Took the throttle body off and cleaned it twice. The temp gauge is straight up, maybe a tick to the left. According to the scanner, this is ~190-210.
There are no driving issues, still gets about 19-20 miles a gallon, and idles smooth. It's just one of those annoying little things that drive me crazy. I do over maintain the thing, oil every 3,000 miles, trans, coolant, PS fluid, transfer case fluid more often than the manual suggests. Always used OEM parts.
The only repair, other than maintenance, was a O2 sensor about 15-20000 miles ago.
My initial thoughts are drive it until the Check Engine light comes on (I know it will) or to ask the learned people on this forum if maybe they know.
When this first happened, I disconnected the battery for 1/2 hour, the idle came down to 600, I thought it was fixed. Well, since then it's happened several times, disconnected the battery, worked great for about 150-200 miles, then started all over again. Once in a while it will return to 600 rpm on it's own.
It doesn't matter if the A/C is on or off.
I checked for codes with a scanner, there are none. Took the throttle body off and cleaned it twice. The temp gauge is straight up, maybe a tick to the left. According to the scanner, this is ~190-210.
There are no driving issues, still gets about 19-20 miles a gallon, and idles smooth. It's just one of those annoying little things that drive me crazy. I do over maintain the thing, oil every 3,000 miles, trans, coolant, PS fluid, transfer case fluid more often than the manual suggests. Always used OEM parts.
The only repair, other than maintenance, was a O2 sensor about 15-20000 miles ago.
My initial thoughts are drive it until the Check Engine light comes on (I know it will) or to ask the learned people on this forum if maybe they know.