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1997 GMC Sonoma Mis-fire

Tiny
AUTOROACH
  • MEMBER
  • 1997 GMC SONOMA
  • 4 CYL
  • 2WD
  • MANUAL
  • 107,000 MILES
I have replaced the fuel pump, filter, plugs, wires.
The truck is still mis-firing, is the problem the ignition coil? Or something else, please help
Thursday, January 24th, 2008 AT 3:27 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Do you have a check engine light On or has flashed?

After you installed the fuel pump did you check the fuel pressure.

Look at the injector/s spray pattern if its a TBI while running is it a cone looking shape and also not breaking.

If it continues to misfire check the EGR and engine compression
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Thursday, January 24th, 2008 AT 4:02 PM
Tiny
AUTOROACH
  • MEMBER
  • 2 POSTS
The truck was running fine after I replaced the fuel pump. The check engine light is on, and when I try to drive it, it starts to blink. A few days later it started to mis-fire. How do you go about checking the fuel injectors? Thank you
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Friday, January 25th, 2008 AT 8:23 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Lets get the computer scanned for code/s and comeback with it-so that we can continue-this is where the diagnosis starts.
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Friday, January 25th, 2008 AT 9:35 AM

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