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1997 GMC Suburban Fouling #6 spark plug

Tiny
RBUNCE
  • MEMBER
  • 1997 GMC SUBURBAN
  • V8
  • 4WD
  • AUTOMATIC
  • 168,000 MILES
I have a 1997 GMC Suburban with 168000 miles. I have developed an issue with my number 6 spark plug. I is fouling out after a few days and my check engine light will come on and after a few days the light will go off. I pulled the plug out and found a light colored carbon deposit on it. There was heavy oil on the threads. I changed out the intake/exhaust valve stem seals. All seamed good. A day later, number 6 fouls again. My next step is to change my intake manifold gasket but I do not want to chase my tail. There is no, repeat no signs of coolant in the oil! What do you think?
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Sunday, January 3rd, 2010 AT 1:29 PM

3 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
What's cyl compression? Plug wire resistence in limits?
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Thursday, January 7th, 2010 AT 3:15 PM
Tiny
RBUNCE
  • MEMBER
  • 2 POSTS
Resistance on #6 spark plug wire is 1.02 using the 20k scale. I personally do not know what the limits are to determine a go/no-go result.
Next is the compression. 120 psi done multiple time to verify.

Thanks
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Saturday, January 9th, 2010 AT 10:12 AM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Plug wire O.K. Compression a tad weak, is code P0306? Do you ever get P0300? What color is deposit on plug?
Plug type Ac 41-932?
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Saturday, January 9th, 2010 AT 1:19 PM

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