Engine cylinder misfire?

2007 CHEVROLET SILVERADO
190,000 MILES
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JEFFJ
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i have a 2007 chevy 1500hd 5.3l v-8 non active fuel management engine giving me a #1 cylinder misfire. the problem is the #1 intake valve when running stopped opening and closing. the funny thing is that when spinning engine with starter the valve opens and closes normally. i thought collapsed lifter. i pulled the head and changed all 8 lifters on the drivers side of engine. put back together and it ran fine for 10 miles or so. then #1 cylinder misfire returned. the intake valve stopped opening and closing again. the camshaft is fine. any suggestions or reported occurrences of this problem? oh by the way. i used all oem chevy parts from distributor.
Oct 17, 2011 at 1:43 PM
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WRENCHTECH
  • CAR REPAIR CONTRIBUTOR
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It sounds like you have low compression or an ignition coil is going out but the be sure this guide should help us fix it.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

Please run down this guide and report back.
May 5, 2021 at 1:43 PM
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JEFFJ
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i have some i phone video's of the problem. i have never seen this before. that is why i am asking for help. i inspected cam: oil pressure good. push rods good. rocker arms and shaft mount good. that's why i'm asking. is there a test you could inform me of?
May 5, 2021 at 1:43 PM
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WRENCHTECH
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Start with compression and vacuum tests and see what they show.
May 5, 2021 at 1:43 PM
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JEFFJ
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my first experience with afm! bad solenoid coil under top cover!!!!! pip4568k
May 5, 2021 at 1:43 PM
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