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1996 GMC Sierra #5 cylinder not firing

Tiny
THUJA
  • MEMBER
  • 1996 GMC SIERRA
  • 6 CYL
  • 4WD
  • MANUAL
  • 110,000 MILES
I had all plugs and plug wires replaced. Pcv replaced.
The problem is the check engine light is on and reading #5 cylinder not firing. The truck runs but performance is weak. Please help.
Thursday, February 21st, 2008 AT 3:47 PM

3 Replies

Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
If the compression is good then your problem is a sticking fuel injector. You can try to have a shop run high pressure fuel injection cleaner through the injectors to try to free it up or you will have to replace the injector assembly. Hope this helps
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Thursday, February 21st, 2008 AT 3:54 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
A misfire in a specific cylinder should lead you to check the spark plug, fuel injector and compression.

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, February 21st, 2008 AT 3:54 PM
Tiny
THUJA
  • MEMBER
  • 2 POSTS
Well I know it isn't plugs or plug wires. Just had them replaced. Will check EGR and injectors. Any more help would be appreciated! Thanks
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Friday, February 22nd, 2008 AT 9:10 AM

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