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1999 GMC Suburban misfire cyl. 2

Tiny
DANIELSON
  • MEMBER
  • 1999 GMC SUBURBAN
Engine Performance problem
1999 GMC Suburban V8 Four Wheel Drive Automatic 300k miles

code reader says cyl 2 missfire, changed plugswires, cap, rotor[not coil] 1st time on engine.
compression good on all 7 [120 lbs] but number 2 is198 lbs.[Carbon build up? If so why only on 1 cyl?]
if u step on it runs on all 8, if no load on engine runs on 7.

thank you Dan
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Thursday, November 12th, 2009 AT 8:37 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Carbon build up will raise the compression in your case no.2 also check the injector for the that cylinder

Misfires can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.
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Thursday, November 12th, 2009 AT 8:41 PM
Tiny
DANIELSON
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Thank you
Dan
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Thursday, November 12th, 2009 AT 9:05 PM

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