Mechanics

4.2 CYL 1 MISFIRE HELP PLS

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
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Loke
July 30, 2012.



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.

Merlin2021
Jul 30, 2012.
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

Tiny
Loke
Aug 4, 2012.