Question about 2004 Chevrolet TrailBlazer

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Changed fuel filter ,added injector cleaner and car still runs rough at idle .what else could it be

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PLugs, wires , clean the throttle body inside, clean the mass air flow sensor, dirty air filter. just to name a few. Check for codes. Even if the light is out, there may be intermittant codes, these wont pop the check engine light and will tell you where to start looking. Let me know. Randy

Posted on May 20, 2011

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  • Chevrolet Master
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Idle problems are almost always a filthy throttle body, which is the most common thing to go wrong with our I6 engines. Clean this first, but disconnect the battery before you do it. We don't have a traditional PCV valve, so the throttle body gets dirty easier than other cars. Must be cleaned at least once a year or more depending on your driving habits.

Spark plugs other than AC Delco 41-103, or the Iridium versions of NGK, Or Denso won't idle as good also. Take Autolight, or Bosch for example, won't idle very well, or last as long.

These two things are the most common, if these don't fix it, check for vacuum leaks, new air filter, upstream 02 sensor. From there, it's gets more in depth and should look to a professional.


Posted on May 20, 2011

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I'm assuming you added fuel injector cleaner to your fuel tank rather than using a direct pressure cleaner through your fuel injectors.
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