2002 GMC Yukon 2002 gmc yukon misfire

2002 GMC YUKON
145,000 MILES • V8 • 4WD • AUTOMATIC
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LILROOSTER56
  • MEMBER
  • 1 POST
i have a 2002 gmc yukon and it has lost all its power the scan tool says it multi misfire. i have replaced the masflow air sensor , checked the injectors ,changed the plugs,test the coils,put and intake gasket on it and still has the miss with no power,would like to know if any one has had trouble with this and what did you do
Mar 15, 2009 at 1:37 AM
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2CARPRO JACK
  • ✓Experienced Mechanic
  • 11,533 POSTS
Check fuel pressure first.If ok then try loosening up the exhaust where the manifold and head pipe meet, pry it back so gasses can get out.Try driving it, if ok you have a plugged cat (or two)
Mar 15, 2009 at 2:17 AM
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