1998 Chevy Tahoe Spark Plug

WSCHWEDLER

MEMBER
1998 CHEVROLET TAHOE
V8
4WD
AUTOMATIC
155,000 MILES

Our 98 Tahoe continues to burn the #4 cylindar Spark Plug. It lasts around 1 to 2 thousand miles. The Porclin around the electrode gets small cracks around it. I feel that a lean fuel mixture could cause this. What would cause only one cylindar to continue to do this?

6 Replies

MERLIN2021

MECHANIC
17,250 POSTS

Lean burning is caused by either a vacuum leak or a bad injector, Any codes stored? Service engine light on? Check the intake manifold gasket. Get a can of spray throttle body cleaner, and spray around the edge of the manifold, a change in idle speed indicates a leak.

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Sunday, October 31st, 2010 AT 11:17 AM

WSCHWEDLER

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4 POSTS

The only Code I get is the for the fowled spark plug. I will try the Throttle Cleaner spray test as you suggest.

Thanks

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Sunday, October 31st, 2010 AT 11:22 AM

MERLIN2021

MECHANIC
17,250 POSTS

P0304?

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Sunday, October 31st, 2010 AT 11:23 AM

WSCHWEDLER

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Yes, exactly

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Sunday, October 31st, 2010 AT 11:33 AM

WSCHWEDLER

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4 POSTS

I sprayed around the intake manifold with Carb Cleaner, no increase or change in engine speed. This engine has a throttle body, could it be causing the problem?