Question about Chevrolet TrailBlazer

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Revs up while idling

I have a 04 Chevy trailblazer and when I start it not only does it idle rough but it reves up like as if I pressed the gas. When i put it in drive it takes off not fast but as if Im pressing the gas after a while it stops but worried. What could this be?? I cleaned the throttle body changed my spark plugs just got a oil change???

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  • 95 Answers

If you didn't correctly reinstall the PCV hose from the black box at the throttle body back on to the valve cover, you might have a vacuum leak causing your high idle. I'd check that first. That is a common mistake to miss that rubber hose. It's hidden underneath the black box at the front of the valve cover. If it is loose, just loosen up the boot at the throttle body, and the two bolts on the right side of the black box above the valve cover. Reposition the 90 rubber hose back on to the valve cover and recheck it. A hissing noise with the engine running is a good indication that the engine has a vacuum leak somewhere- usually a rubber hose disconnected from the intake manifold or throttle body.

Posted on Oct 19, 2013

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Posted on Jan 02, 2017

  • 4 Answers

SOURCE: starting and rough idle

I had a very similar issue. Mine ended up being my "lower crankcase vent tube" It apparently had a hole in it that was causing oil to spew all over (and causing my valve cover gasket to leak as well due to a pressure issue). Got that replaced last Friday (my mechanic discovered it when he was replacing the belts I slung on Wednesday) and the car has started perfect ever since.

Posted on Sep 08, 2009

  • 25 Answers

SOURCE: I own a 2002 Chevy Trailblazer with 4200 vortec

Do you know if the plugs were changed, a bad or broken plug will also cause rough idle and slow acceleration?

Posted on Oct 21, 2009

ryanlutton
  • 1119 Answers

SOURCE: 2005 chevy trailblazer, rough start,

With temperature related problems, check your intake manifold bolts for tightness. Our intakes are plastic and have a tendency to become loose, causing vacuum leaks. When it warms up, the plastic intake will expand sealing any leaks. But when it's cold, will contract, causing leaks. Easiest to check are cylinder #5 & 6 near the fire wall.

Also, clean your throttle body, a dirty throttle body will cause idle problems, especially in TB's because we don't have a true PCV valve, so gets dirty which causes sticking of the butterfly.

Posted on May 19, 2011

  • 514 Answers

SOURCE: Have an 03 chevy trailblazer about 3 or so months

check for any vacuum leaks, check for fuel pressure too, sometimes the gas pump,fuel filter,or fuel pressure regulator fails, does your car have the check engine light on? if so must pull the trouble code in order to fix the problem, Thanks

Posted on Nov 17, 2011

  • 14036 Answers

SOURCE: 02 Trailblazer misfire

sound like oil getting on spark plugs and coils check them again more likely you need to replace ignition coil seals

Posted on May 29, 2013

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Check the help links related to this problem.Click the link below to go through its troubleshooting procedure :-----Idles rough and quits when gas pedal is pressed less? http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html---------
Car won't start without hitting the gas pedal? http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-without-hitting-gas.html
-------Complete loss of brake pedal then all gets normal? http://repairhelpcenter.blogspot.com/2012/01/complete-loss-of-brake-pedal-then-all.html
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http://technoanswers.blogspot.in/2012/02/pushing-on-gas-pedal-but-car-slows-down.html

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After replacing brake rotors and pads, brake pedal remains on floor? http://technoanswers.blogspot.in/2012/02/after-replacing-brake-rotors-and-pads.html

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accelerator pedal sensor? http://technoanswers.blogspot.in/2012/02/2009-chevy-impala-accelerator-pedal.html

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This will help.

Thanks.

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1 Answer

Have an 03 chevy trailblazer about 3 or so months ago I had to change one of the COP and so changed all spark plugs while I was in there and cleaned the throttle body was running better after but when just...


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If by chance you have just recently changed the battery or had the battery unhooked. Let me know, it's an easier fix that costs virtually nothing.

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