Question about 2003 Chevrolet Blazer

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2002 chevy 3.6 vortec runs rough misses until warm

Engines misses runs extremely rough after a few minutes after start up until warmed up

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Read codes first. this is most likely a blown head gasket. you will probably see a random misfire code. when engine is stop it getting water in the cylinders, when it warms up it then hot enough to dry the cylinder out. good luck

Posted on Apr 18, 2014

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I had the same problem and it was the air flow censer. It is located between air filter and intake housing . what I did was remove it from hose and dipped it in coke...cola that is!! . cleaned it real well. do not use varsol or turpentine, they will damage the censer. hope this works for you . good luck.

Posted on Apr 17, 2014

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Check fuel filter and air filter if its clean check your fuel pressure regulator

Posted on Apr 17, 2014

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Posted on Jan 02, 2017

GregV24CHOPP
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SOURCE: when cold, it idles rough, revs high then low! After warmed up it runs fine

if it runs high when you first start it then mellows out,, theirs no problem , all of our chevys do that.... but if its sputtering or you hear a quiet popping noise check spark plugs

Posted on May 20, 2009

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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

  • 1 Answer

SOURCE: 93 chevy lumina euro won't stay running

sounds like it could be a fuel injector shorting out. have to get it hot, pull off the plenum and check the resistance in each injector. if any injector has bad resistance, replace it. when an injector shorts out on these particular vehicles, it shorts out the whole injection circuit. and when it cools off the resistance goes back up and it will run ok. i think the correct resistance should be about 13 ohms.

Posted on Mar 19, 2010

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SOURCE: ticking noise in engine before engine warms up stops when warm

might be a bad lifter

Posted on Apr 22, 2010

SOURCE: 2002 s10 zr2 runs rough bogs down when you

First check for any cracked pipes leading into the intake manifold If all OK (with no codes showing it probably is OK) try checking the fuel pressure regulator. If you smell fuel from the pressure regulator vacuum side arm (when the vacuum line has been disconnected) it needs to be replaced.

Posted on May 28, 2010

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