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Misfire

Tiny
JOSE559
  • MEMBER
  • 2008 CHEVROLET SILVERADO
  • 6.0L
  • V8
  • AUTOMATIC
  • 125,000 MILES
Changed all plugs, coils, wire set, and injectors still a misfire.
Sunday, September 23rd, 2018 AT 5:23 PM

9 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening.

Did you check the compression? I would start there first to be sure the engine can produce power.

The other issue could be a lifter or camshaft. The six liter was very well known for a failure of the lifters and camshaft. The valve barely moves and the cylinder will not work correctly.

The way to confirm is to remove the valve covers and run the engine and see if all the valves are moving equally.

Roy

https://www.2carpros.com/articles/how-to-test-engine-compression
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Sunday, September 23rd, 2018 AT 5:53 PM
Tiny
JOSE559
  • MEMBER
  • 4 POSTS
It is a v8 and the compression came back fine.
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Sunday, September 23rd, 2018 AT 6:01 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I know it is a V8.

What was the compression?

What about checking the lifters?

Roy
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Sunday, September 23rd, 2018 AT 6:03 PM
Tiny
JOSE559
  • MEMBER
  • 4 POSTS
Yeah, it came back fine and no not yet, but the first to gears kick but after that it runs smooth. Took it to see if anything is wrong with the transmission and it is in perfect shape.
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Sunday, September 23rd, 2018 AT 6:13 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Transmission does not cause an engine miss.

Still need the compression number to see what the actual reading.

Roy
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Sunday, September 23rd, 2018 AT 6:16 PM
Tiny
JOSE559
  • MEMBER
  • 4 POSTS
125.
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Sunday, September 23rd, 2018 AT 6:33 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, that is low. If it is the same on all cylinders, then compression is not the issue.

I would pull the valve covers and watch the valves.

Roy
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Sunday, September 23rd, 2018 AT 6:34 PM
Tiny
JOSE559
  • MEMBER
  • 4 POSTS
You think it can be the lifters?
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Sunday, September 23rd, 2018 AT 6:51 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Maybe or the cam.
That is why it needs to be checked.
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Sunday, September 23rd, 2018 AT 6:56 PM

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