Question about 1998 Ford Windstar
I have a 98 ford Windstar 3.8L engine with the middle cylinder (Firewall side) failing. it's not burning oil but there is a black soot mixture that sprays out of the tail pipe when I start it up in the morning, smells like unburned gas. The mechanic that I took it to said the spark plug he removed was covered in oil and that the cylinder has a 30 PSI lower then the other 5 cylinders. What I don't understand is, shouldn't it be burning oil (blue smoke)? The mecanic also mentioned something about backflow pressure, causing the airfilter assembly to leak oil, so he rerouted the valve cover hose away from it to a container that catches the small drops of oil it spills, smells really bad... My question is, could it be more of a valve issue than a cyilder block/rings issue?
It sounds like you have a broken piston ring This condition allows compression gasses to enter the oil pan and pressurize it, causing blowby that will find it's way into the air cleaner. A bad valve will not do this as compression would be blown either out the exhaust or intake, but no oil. It would usually be accompanied by a "blapping" noise in the intake or exhaust and a lot of engine shake while running. If you have lots of miles on the engine consider repowering it or buying a new vehicle as the repair will be quite expensive.
Posted on Jun 04, 2009
I think you could be right. Leaking valves could create this same problem as well.
Posted on Jun 04, 2009
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Posted on Jan 02, 2017
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