2000 Cadillac Deville valve tapping

BIGEC4000

MEMBER
2000 CADILLAC DEVILLE
V8
2WD
AUTOMATIC
56,000 MILES

I JUST CHANGED MY SPARK PLUGS. (BOSCH PLATINUM 2+). NOW I HAVE A TAPPING VALVE WHERE I REPLACED A WORN SPARK PLUG. THERE WAS A LIL DEBRIS THAT POSSIBLY FEEL THROUGH THE SMALL HOLE. MY NEXT STEP IS TO REMOVE VAVLE COVER AND FIND TAPPING VALVE AND REMOVE DEBRIS. DOES THIS SOUND LIKE A POSSIBLE ROUTE?

3 Replies

FACTORYJACK

MECHANIC
4,159 POSTS

Your not going to get any debris out by removing the valve cover. If you suspect that something went into the combustion chamber, remove the spark plug and run it or crank it. The compression pressure may blow it out.

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Tuesday, April 7th, 2009 AT 9:38 PM

BIGEC4000

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9 POSTS

SO THE DEBRIS WENT IN COMBUSTION CHAMBER. WHAT IS CAUSINNG THAT TAPPING IN THE VALVES THEN.

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Tuesday, April 7th, 2009 AT 10:31 PM

FACTORYJACK

MECHANIC
4,159 POSTS

If you think the debris went through the little hole, it ended up in the combustion chamber. Removing the valve cover would put you in the valve train, no debris that went through the spark plug hole would be found in the valve train. It sounds like you had some porcelain make it's way into the combustion chamber. You can run it, it will eventually turn the porcelain into dust and process it. Pulling the valve cover would expose nothing that you could have created. Having not heard the noise, I can only suspect. It may be the result of carbon on the pistons causing noise as well.

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Thursday, April 9th, 2009 AT 4:57 AM