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Discussion Starter · #1 ·
My grandma’s Ford Windstar has been smoking at start up. Also a little rough idle on hot starts, but hard to re-create consistently. The van has about 160k mikes and is maintained very well. I checked the compression: 190, 215, 190, 190, 210, 190. The middle two cylinders have very high compression!!! Also, those two spark plugs had heavy/dark fouling, and oil on the threads. What is the most likely culprit? And what should I do??
 

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Discussion Starter · #3 ·
Thanks, that’s what I figured. Either that or piston ring. I don’t have tHe tools or ability to perform a leak down test to confirm. No engine codes are on. Questions: 1. Does it harm the engine to keep driving it this way assuming it’s the valve seals? 2. Would seafoam help? 3. Would replacing the pcv valve help?
 

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Make sure the PCV valve is working o.k and hose is clear as it can cause crankcase pressure build up that wont help suspect seals .Usually causes build up of carbon on the valves from the oil ..
 
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