Spark Plug Gap

What is your question?

Current gap is .065. Called for .060. What is "too much" or "too little" gap amount? I plan on replacing, but do I need to w/ this gap?

Reagan in Vancouver WA

Jan 27, 2010

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What are the best GMC repair shops?

RepairPal Certified shops can diagnose and repair your 1999 GMC Yukon. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.

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What is your question?

Popular Answer

Spark Plug Gap

What is your question?

Current gap is .065. Called for .060. What is "too much" or "too little" gap amount? I plan on replacing, but do I need to w/ this gap?

Reagan in Vancouver WA

Jan 27, 2010

1 Reply

Popular Answer

Oakmanon Jan 27, 2010

The .065 gap on the spark plugs in your 1999 GMC Yukon is not excessive for slightly worn spark plugs. Your Yukon should have come from the factory with Platinum spark plugs designed to last 100k miles. You will need to determine when your current spark plugs should be replaced depending on the type of plugs installed and how many miles they have on them. If your engine is running OK chances are the spark plugs do not need replacing at this time.

Reaganon Jan 27, 2010

ok here are more details on that. Engine running really rough. Code says CMP and CSP correlation off. I have through trial and error determined that a new DISTRIBUTOR is in order. Putting that in tomorrow. Basically going through car and eliminating any variables. Plugs and wires (and cap and rotor) replaced 25,000 miles ago. All looks good for wires and plugs...but that old saying creeps in my head. "When you replace distributor ALWAYS replace plug and wires." That is why I ask about gap in plug. It seems they are in good condition. no excessive color, burning etc...

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Popular Answer

What are the best GMC repair shops?

RepairPal Certified shops can diagnose and repair your 1999 GMC Yukon. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.