Question about 2003 Chevrolet TrailBlazer

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Idles up and down when my 2003 trailblazer is in nuetral

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  • Chevrolet Master
  • 420 Answers

First check your vacuum lines. If it isn't a bad vacuum line it is most likely the O2 sensor on one of your manifolds.

Posted on Apr 21, 2009

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  • Chevrolet Master
  • 76,691 Answers

Here is the common problem and fix.

Here are some of the causes of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Posted on Apr 21, 2009

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SOURCE: my 2003 chevrolet trailblazer is idleing rough when stopped

I would start by checking the oil level. See where it is at. Did you have the oil changed by a reputable oil change place or dealership? Let me know if the oil is at the correct level on the dipstick and we can go from there.

Posted on Jul 31, 2009

  • 4 Answers

SOURCE: 2003 Chevy trailblazer, Idle's fine,

possible feul filter clogged or could have low feul pressure from the pump should have at least no less than 35lbs of pressure continuous to injectors when accelerating

Posted on Jul 30, 2008

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Idle problems trailblazer


Check or replace Fuel Filter... have somebody check your idle speed....

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High idle shifts hard but idle will go back down but shifts hard


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My 2003 chevrolet trailblazer is idleing rough when stopped


I would start by checking the oil level. See where it is at. Did you have the oil changed by a reputable oil change place or dealership? Let me know if the oil is at the correct level on the dipstick and we can go from there.

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2003 Trailblazer sometime stalls when I come to a stop...


its most likely the throttle body is dirty, just remove the air box on top of the engine and clean the throttle body out with carb cleaner.

Apr 24, 2009 | 2003 Chevrolet TrailBlazer

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Chevy Trailblazer 2003 ran the battery down now wont idle


try changing the air filter ,i had a problem ,at ilde in drive my trailblazer would stall, changed the air filter now it's not stalling and got my power back ,there is a secondary air pump that i have to change ,
not sure were it is ? still not running perfect but it's running better .and my service light is on too.
i got it put on scope ,it's the pump .
not sure if this helps ,but i'm start to run in to problems too,i have a 2004 trailblazer.
i like to do fix things myself ,i hope i can.it's the cost if you know what i mean.

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