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High idle when cold on 2002 trailblazer - 2003 Chevrolet TrailBlazer

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SOURCE: when ever the reduce engine

Need to have the engine scanned to see what part of the system is causing the service engine soon light to come on and to see what's causing the idle to be really high.

Posted on Aug 06, 2010

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1 Answer

My trailblazer is idling high any help

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It would be a help if you could let us know the idle speed when cold?
Vehicles usually have a higher tick over when they;ve been standing and are cold. It would increase by a few hundred RPM and then quickly drop back to normal as the engine warms up....
Regards Johngee10

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2002 Chevy Trailblazer 6 cyclinder engine (112,000 miles to date) choking up at idle (not stalling, yet), smell of surpur at tailpipe exhaust, computer code P1345 for the camshaft and chankshaft sensor...

It sounds like your EGR valve needs to be replaced. You can go to any auto parts store and get one. Try replacing spark plugs and plug wires also. If the timing was off it would pick up speed slowly and would vibrate really bad at idle. When you go to accelerate if it doesn't accelerate normally it may be the timing but i highly dought it. Try plugs and wires first. then the EGR valve.

Sep 29, 2010 | 2002 Chevrolet TrailBlazer

1 Answer

When ever the reduce engine power light comes a 2002 trailblazer 4.2 the suv act like it dont want to change gears and idles real high.

Need to have the engine scanned to see what part of the system is causing the service engine soon light to come on and to see what's causing the idle to be really high.

Aug 06, 2010 | Chevrolet TrailBlazer Cars & Trucks

1 Answer

I have a 2002 Chevy Trailblazer. Just replaced

If you unhooked battery it will need to relearn its idle position, should help if you clean throttle blade edge and body of carbon so proper amount of idle air can enter engine.

Feb 28, 2010 | 2002 Chevrolet TrailBlazer

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My 2002 trailblazer makes a noise that sounds like a belt shredding that comes from front right wheel mostly in cold weather

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Rpms runnin high when driving

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Jun 14, 2009 | 2002 Chevrolet TrailBlazer

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Its sounds to me like the batteries, check them.

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