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Old 01-21-2022, 12:50 AM   #1
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Default 2003 vue 3.0 random misfire and cam position sensor codes

So from the beginning this is my son's gf vehicle. It had a miss on cylinder 5 I pulled it apart put coil pack and all new ac delco rapid fires put back together with new gaskets and still didn't run like I thought it should. I then ran seafoam thru the vacuum lines let it heat soak for 30 mins or so and ran it it came alive and was running amazing.

Fast forward to this previous Monday the vue's belt tensioner pulley siezed up and burnt up the belt. I got a belt and put it on started it up and took for a 15 min drive. About 5 miles from the house ses light started flashing and lost all power except at very slight throttle. Pull codes and I have a cam positioning sensor code an 02 sensor bank 1 sensor 1,and random multiple misfires. I pulled intake and plugs and only 135 were firing 246 were wet as was the intake runner to cyl's 246. Cleaned plugs put it all back checking connections and vacuum lines. Once back together started and same thing checked coils on 246 and they are firing still getting random misfire and cam sensor codes. Racked my head trying to figure out why one side would run as it should and the other not at all picked up cam sensor as it was the first code that came up. Replaced it and nothing changed at all I can unplug the coil pack while running and nothing changes at backfiring at all.

I am trying to not throw parts at it . But I am leaning toward ecm coil pack looks good and coil tester shows it is firing.
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3.0l v6, misfiring, vue 03

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