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1999 Chevy S-10 Misfire

Tiny
MCMASON21
  • MEMBER
  • 1999 CHEVROLET S-10
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 10,700 MILES
I have a 99 s10 and I am getting the random misfire error in the last 4 months I have replace the spark plugs, wires cap and rotor (twice) cleaned the mass air flow and the problem seems to be getting worse it know has a rough idle and boggs when I give it gas the fuel pump is only a year and a half old. What is my next step?
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Saturday, May 29th, 2010 AT 9:12 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Random misfire is normally caused by vacuum leaks and contaminated fuel
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Saturday, May 29th, 2010 AT 9:34 PM
Tiny
MCMASON21
  • MEMBER
  • 2 POSTS
Checked wires for continuity all tested good tested spark plugs all good tested cap for continuity all good not getting and spark on cylinders 4 and 5 from distributer unplugged those while running and there was no change? Changed fuel filter and there were no vacuum leaks.
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Sunday, May 30th, 2010 AT 3:07 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the compression and injectors on those non firing cylinders
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Sunday, May 30th, 2010 AT 8:48 PM

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