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Number 4 misfire

Tiny
MLLANE
  • MEMBER
  • 1999 CHEVROLET TAHOE
  • V8
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
1999 Chevy Tahoe V8 4x4 with tow package 4door. Misfire on number 4 piston. Changed plugs, plug wires, dist cap and roter button. Runs rough at idle but good at highway speeds.
Wednesday, June 29th, 2011 AT 8:34 PM

5 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the compression and injector for no.4 cylinder
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Wednesday, June 29th, 2011 AT 9:03 PM
Tiny
MLLANE
  • MEMBER
  • 3 POSTS
What should the compression be.
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Wednesday, June 29th, 2011 AT 9:12 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Should be around 140-160 psi
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Wednesday, June 29th, 2011 AT 9:14 PM
Tiny
MLLANE
  • MEMBER
  • 3 POSTS
Ok I have 148 psi
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Wednesday, June 29th, 2011 AT 9:15 PM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Did you find out anything about how the injector was operating? It sounds like it isn't properly atomizing the fuel.
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Thursday, July 21st, 2011 AT 7:48 PM

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