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Any thoughts on going from v6 to a v8? I have 91 ex with numerous problems, thinking about putting a v8 in her, other wise I love the truck, thanks

What's up, bad rings? blown head gasket?

What would cause this, replaced PVC valve, didn't seem to help much, I appear to losing about a quart of oil every 1000 miles or so, can not see any leaking spots.

Can someone please tell me where the IAT is in a 1991 Explorer? I looked at pic in Haynes, still can't gigure it out. My MAS tubing doesn't seem to be the one in the picture. Still trying to get rid of pinging while accelerating in OD.....Thanks

Thought I had an octane issue, Lower Intake bolts are ok, Cleaned MAS sensor, TPS replaced, IAC replaced, CPS replaced, ICM replaced, fuel filter replaced, air filter replaced, Temperture sensor replaced, No more pinging in Drive=3rd gear as I understand it, Pinging in OD=4th gear as I...

My ex wont start after driving for more than 5 minutes, starts up fine after it cools down, mechanic told me it was the crank position sensor? Any ideas?

91' pinging.....doe's this model year have a knock sensor, and if so, where is it located? Does it more in overdrive, as opposed to Drive, but still does it and more when going up a hill or into strong headwind. Between 55 and 75 miles per hour, any suggestions?

I have replaced IAC, starter, tps, temperture sensor, battery, only happens after driving for longer than 5 minutes, let it set for a couple of hours and it starts fine.