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Old 11-01-2011, 05:11 PM   #6
diesel1962
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Join Date: Mar 2005
Location: Grand Rapids, Michigan
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Re: Spark Knock,78' Cadillac

Hey Max,I removed EGR valve and found it was stuck half way open.Cleaned and lubed valve and it don't work.Vacuum is shot on it.But the engine does idle allot better and the spark ping is about gone.Have to save my nickels and dimes to buy a new valve! LOL!!.Any way thank's for the info...Diesel1962
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