Question about 2004 Chevrolet TrailBlazer

3 Answers

I have a 2005 Chevy Trailblazer EXT LS 4X4 w/ 4.2 engine. Runs rough when accelerating and at a stop. When the A/C is turned off the rough idle stops, but it will still miss a little when accelerating even with the A/C off. I have removed/thoroughly cleaned the throttle body with carb/throttle body cleaner and wiped it dry. I also replaced the battery and reset the computer by holding the battery cables together for 10 seconds. There were no error codes after scanning the engine with a hand held scanner. The A/C compressor clutch is turning freely. Any ideas?

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  • Freddy Sep 25, 2010

    One possibility is weak coil pack or bad spark plug. You have the engine scanned with a professional scan tool to see if there are any stored codes that a handheld scanner will not pickup

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3 Answers

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  • Chevrolet Master
  • 378 Answers

It could be as easy as cleaning or replacing the I.A.C. (idle air controller) it may need to be replaced if you can not clean it good. When was the last time to replaced the fuel filter? if it persists wait until dark lift the hood, have someone start the vehicle and raise the idle watch for an arc, identify the wire and replace it. Another thing to check would be the throttle body gasket get a spray bottle put it on mist with water in it, start the vehicle, sprat around the bottom of the throttle body, if it bogs down replace the gasket, by removing the 4 bolts lift the throttle body replace the gasket and replace the bolts.

Posted on Apr 27, 2017

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  • Chevrolet Master
  • 1,142 Answers

Appears you've done some homework. Try taking out fuse # 10 and fuse # 28 under the hood. Keep them out for 30 minutes, this is the way most of us reset of the PCM on our platform after a TB cleaning. I'm betting the PCM needs to relearn correctly. Next time you're cleaning the throttle body, unhook those fuses prior to doing anything. By the time you're done cleaning, sufficient time will have passed.

Posted on Apr 27, 2017

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  • Chevrolet Master
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When was the last oil change --check and test the and or clean the camshaft position actuator solenoid its on passenger next to the powering steering pump the connection sometimes gets oil soaked and or the screen get clogged --if oil is old or low effects the sensor check and test the camshaft position sensor also it also is affected by oil ---other problems can be a plug or coil failing

Posted on Apr 26, 2017

6 Suggested Answers

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Posted on Jan 02, 2017

bibleman01
  • 334 Answers

SOURCE: idle too high on a 06 cobalt

when you clean it make sure that you hold the butterfly open so you can get the spots clean that need it. If there is anything in the way the butterfly will not close. Just a small bit of dirt will do this .

Posted on Dec 26, 2008

  • 4 Answers

SOURCE: 2002 chevy trailblazer has rough idle

it could be an o2 sensor. it could also just need a tune up

Posted on Mar 15, 2009

rockitman187
  • 2559 Answers

SOURCE: rough idle

Check or replace the EGR

Posted on May 27, 2009

  • 38 Answers

SOURCE: 1989 Chevrolet C1500 with 5.7L V-8. Engine dies

fuel pump is working but when accelerating it doesnt pump enough fuel up to the engine then it will fall on its face if it is a electric pump you may have to drop the tank if it is inside and replace it if it is on the engine replace it thats what is exactly wrong with it

Posted on Jul 31, 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

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1 Answer

I have a2005 chevy trailblazer 5.3...no oil pressure at a idle...50 lbs when I step on the gas.changed the oil pump same thing


Have you checked the pressure with a mechanical gauge to make sure the gauge on the dash is correct ?
And did you check the rod and main bearings for excessive wear when you replaced the pump ?

Mar 25, 2016 | 2005 Chevrolet Chevrolet TrailBlazer EXT...

1 Answer

My 2006 Trailblazer EXT LS gave a p0017 engine code. I replaced the camshaft sensor and it still has a rough idle and hesitates until you get up to 35mph. What should I do now?


Poo17 is for sensor b therefore you have a senor a on the cam as well and it maybe creating the problem. you need to check it as well. The code for cam senor a is poo16. If it runs rough when you start it you may have a bad idle air control or engine tem. control which tells the computer what the temp is outside and determines how much fuel is put into the engine. I would check the idle air control first.

Aug 01, 2015 | 2006 Chevrolet Trailblazer

2 Answers

2002 chevy trailblazer has rough idle


it could be an o2 sensor. it could also just need a tune up

Mar 15, 2009 | 2002 Chevrolet TrailBlazer

1 Answer

At stop rough idle


idle air speed controller.
dirty throttle body
air cleaner clogged
air flow meter
bad injector
leaking intake manifold
vacuum leak
bad plugs
ignition components

Nov 22, 2008 | 2005 Chevrolet Trailblazer Ext

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