CRC2362 Posted June 6, 2007 Report Share Posted June 6, 2007 Hi Everyone, I have a 99 Deville, 56,500 miles when do I need to change out the plugs and wires? I do both city and highway driving- getting about 18/25 mpg. I only put in 93 octane gas and do a few WOT's every so often (no smoke out the tail pipe). Over all the car runs great and no codes. Thanks foe any comments. Craig. Link to comment Share on other sites More sharing options...
Ranger Posted June 6, 2007 Report Share Posted June 6, 2007 100K is the recommended change (or when it starts to misfire). Link to comment Share on other sites More sharing options...
KHE Posted June 7, 2007 Report Share Posted June 7, 2007 For spark plugs it's 100K. The wires just need to be inspected - if they are not arcing, they are fine. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
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