I have a 2003 Trailblazer and randomly it wont start. Sometimes 1 2 or 3 times. But after it starts right up. Does have alittle bit of a ruff idle also. Any ideas what it might be??

Asked by Oct 15, 2016 at 12:49 AM about the 2003 Chevrolet TrailBlazer LS

Question type: General

1 Answer

Knock sensor, knock sensor connector, or you have a bad PCM. If ur lucky you'll have bad fuel pump or low fuel pressure all easy an affordable fix's mainly sounds like fuel pump an fuel filter problem. Worst case is bad PCM its 239$ to replace PCM. Your knock sensor if its bad can cause horrible hesitation when running or complete shut down of motor so there is no damage to be done to the motor. BV most common problem on these truck is that the knock sensor connector goes bad due to the simple fact they are made shitty

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