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2002 GMC Sonoma #3 cylinder intermittent misfire

Tiny
TOMMYB79
  • MEMBER
  • 2002 GMC SONOMA
  • 4.3L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 86,000 MILES
# 3 cylinder seems to be misfiring off and on.
I have replaced everything from the coil down to the spark plugs, but have had no success.
Any ideas?
Thank You.
Saturday, September 26th, 2015 AT 5:11 PM

4 Replies

Tiny
CAR-MAN145
  • MECHANIC
  • 321 POSTS
There is an injector web inside the upper intake and they have many problem with these injector plugging up. Most cleaners won't work so the injector needs to be replaced
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Sunday, September 27th, 2015 AT 1:12 AM
Tiny
TOMMYB79
  • MEMBER
  • 7 POSTS
Thank you.
Is it much of a job?
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Sunday, September 27th, 2015 AT 2:52 PM
Tiny
CAR-MAN145
  • MECHANIC
  • 321 POSTS
I would say on a scale from 1 to 10 its a 5 so not to bad but it takes some work.
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Sunday, September 27th, 2015 AT 11:37 PM
Tiny
TOMMYB79
  • MEMBER
  • 7 POSTS
Yes it was a bit of a job. No problem though. As far as the injector goes, it was fine. Glad it wasn't the problem. Found out I can't just replace one, I have to replace the whole web. It is an updated web The injectors are in the intake, not the poppet valves. Thanks for the help.
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Wednesday, October 14th, 2015 AT 1:31 PM

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