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#1
11-04-2006, 08:08 PM
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Curious about spark plugs
Hi AF buddies, two years ago I bought this Lumina APV '91 and, being a novice with car maintenance, all I've been doing is the usual change of air filter, fuel filter, oil filter, oil, spark plugs, etc. (just only once I gathered the courage to make a change of fuel pump followed by a proper tank wash
 ). But what's been boggling my head is: Why everytime I change spark plugs, SP#1 at the back seems to be the one that gets most of the sludge. SP#3 and SP#5, also at the back, get it at a lesser degree while #2, #4 and #6 at the front look cleaner than the rest???Please illuminate my mind!!! 
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#2
11-05-2006, 04:14 PM
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Re: Curious about spark plugs
Your number 1 cylinder is probably burning oil to some degree and the 3 and 5 are not burning as much.
Is the engine a 3.1? how many miles? Wife has a 91 lumuna APV but I think the engine was changed before we bought it a few years ago. Can't determine the age. Put some oil additve in the crankcase that removes carbon and sludge then after a week change the oil again. Sometimes this helps frozen rings and valves.
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