did autolite spark plugs screw up coil or coils ?? - Toyota Yaris Forums

yaris-me · 04-05-2009, 11:49 PM

The Denso plugs have an Iridium tip which can last for 100,000 miles. That is why they cost so much. So long as the tips aren't broken or damaged, they should be usable with the proper gap. You need to find a mechanic that will diagnose your problem.

TheSilkySmooth · 04-06-2009, 10:51 AM

Quote:

Originally Posted by yaris-me

The Denso plugs have an Iridium tip which can last for 100,000 miles. That is why they cost so much. So long as the tips aren't broken or damaged, they should be usable with the proper gap. You need to find a mechanic that will diagnose your problem.

Sometimes if you glaze over the plugg insulator tip it will short to the nut and start misfiring. Only way out is to replace. This is usually caused by some oil fouling, then hard operation. The metals in the oils plate out on the insulator and then its no longer an insulator - its a resistor. -
I agree with you that the OP needs a good mech to diagnose his probs. Now where can he find a good mech .... Any recs from guys around where the OP dwells?

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04-05-2009, 11:49 PM	#1
yaris-me Learn to Relax Drives: 2007, Meteorite, LB Join Date: Dec 2008 Location: Anaheim, CA Posts: 2,070	The Denso plugs have an Iridium tip which can last for 100,000 miles. That is why they cost so much. So long as the tips aren't broken or damaged, they should be usable with the proper gap. You need to find a mechanic that will diagnose your problem.