99 Winstar,3.8,auto,AC.Ping strtd 10 months ago. Check eng light came on.
Never checked codes(didnt have means). Bought scanner and found P0174
stored. Cleared code and it hasn't come back. Checked for vacuum leak w/
carb clnr and gauge read 15-20 inches and steady at idle. No vac
leaks.Tried higher octan fuel,no good.Had injction systm cleand.No good.
Swapped Known good MAF, no good. Replaced one questionable down stream Ho2
no good. Fuel pressure ok(32-40). Fuel does not look contaminated. Don't
know where to go from here.
Ping is detonation. My stang does it all the time when a) weather gets hot,
or b) I use anything less than premium. Of course, I have the timing set way
high. Thus, I would say go with the highest octance, but in a Winstar?
Maybe timing? Worth checking.
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