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Re: Need Help With 99 WIndstar Check Engine Light ...codes p171 & p174...
Carbon deposits inside the cylinder. This would effectively DECREASE the chamber size (in the head) and thus compression would increase. This could cause pre0ignition otherwise known as pinging.
Unless of course Lewis is refering to something else.
Are you getting a flashing CEL? indicating a misfire? This could be mis-described as pinging too.
Last edited by DRW1000; 04-13-2005 at 08:11 PM.
Reason: correction
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