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Engine cylinder misfire?

Tiny
JEFFJ
  • MEMBER
  • 2007 CHEVROLET SILVERADO
  • 190,000 MILES
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.
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Monday, October 17th, 2011 AT 1:43 PM

4 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
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.
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Wednesday, May 5th, 2021 AT 1:43 PM
Tiny
JEFFJ
  • MEMBER
  • 36 POSTS
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?
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Wednesday, May 5th, 2021 AT 1:43 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
Start with compression and vacuum tests and see what they show.
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Wednesday, May 5th, 2021 AT 1:43 PM
Tiny
JEFFJ
  • MEMBER
  • 36 POSTS
My first experience with afm! Bad solenoid coil under top cover! Pip4568k
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Wednesday, May 5th, 2021 AT 1:43 PM

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