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1996 Chevy Tahoe misfires

Tiny
ALESTER
  • MEMBER
  • 1996 CHEVROLET TAHOE
  • V8
  • 4WD
  • AUTOMATIC
  • 167,000 MILES
Ok here it goes. On my 1996 chevy tahoe it get a misfire code on the #7 cylinder. I changed the plugs wires cap and rotor to no fix. The car runs good when ur driving. But at a stop with your foot on the brake it is fine for a little bit then the RPMs start to go up and down and the car wants to move. And now after replacing all that it starts hard. When I turn the key the 1st time it wont start. It takes about 2 or 3 times before it will strart but after its started and I go to the store it will fire rite up. Not really sure what the problem is but im on a tight spending budget from being layed-off. Please help
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Wednesday, August 25th, 2010 AT 9:05 AM

7 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
Is the plug from that cylinder getting real dark or staying real white?
Is it setting any other codes and what are they?
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Wednesday, August 25th, 2010 AT 9:58 AM
Tiny
ALESTER
  • MEMBER
  • 5 POSTS
Nope no other codes plug is getn a little white. The temp of the manafold is the same as the others using a fluke temp lazer heat gun. Just really not sure what the problem is
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Wednesday, August 25th, 2010 AT 10:28 AM
Tiny
ALESTER
  • MEMBER
  • 5 POSTS
The only code I got was #7 cylinder misfire. Not really sure what the next step is I did all the regular stuff. What would the next step be with it stayn white or if it was black I just changed the plugs a few days ago
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Wednesday, August 25th, 2010 AT 10:42 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
What does that mean? I'm trying to find out if the plugs are fouling or not.
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Wednesday, August 25th, 2010 AT 11:36 AM
Tiny
ALESTER
  • MEMBER
  • 5 POSTS
Oh sorry they look like new with black charing on them sorry. I was just asking if they were black what would that mean and if they were white what would that mean? Im really not a car guy just the basics
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Wednesday, August 25th, 2010 AT 11:44 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
It can't be both ways. I'm afraid this may be beyond your abilities. Your going to need some hands on help.
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Wednesday, August 25th, 2010 AT 12:23 PM
Tiny
ALESTER
  • MEMBER
  • 5 POSTS
I just went out and pulled the #7 spark plug and yes it did have like a white powder on it. Cleaned it up put it back and it didnt change anything
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Wednesday, August 25th, 2010 AT 1:17 PM

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