TRAILBLAZER 4.2 CYL 1 MISFIRE HELP PLS

  • Tiny
  • loke
  • 2004 Chevrolet Trailblazer
  • 198,000 miles

I have a 2004 chevy trailblazer with 4.2 6 cyl I have changed plugs and coil packs run inj cleaner changed map sensor and still running rough I cleaned throttle body cleaned pcv hose I also checked to be sure coils was aligned and down tight still idles at 500 and turn ac on goes between 3&400 pls help lol not sure wat to do from here

Monday, July 30th, 2012 AT 5:50 AM

2 Answers

  • Tiny
  • merlin2021
  • Expert
  • 17,583 posts

First you need to solve #1 misfire check compression and fuel injector at #1 the. If problem is neither of those post all stored. Codes here. Iac ( idle air control). Coyld be ng.

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Monday, July 30th, 2012 AT 10:55 AM
  • Tiny
  • loke
  • Member

Comp good and checked injector wiped all codes out and drove a few miles till ck eng light was flashing only code was p301 misfire on cyl 1 no other codes and still running rough

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Saturday, August 4th, 2012 AT 1:34 AM

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