Smoke from tailpipe (read)
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From: Las vegas, Nevada.
Smoke from tailpipe (read)
2001 4.6 liter, dealer maintained its entire life, runs, idles, excellent. 160,xxx miles. No smoke on cold starts, none! Only puffs blue smoke (oil) when at full operating temperature after idling for a few minutes. Everything is pointing towards valve seals, except that there's no smoke upon card start ups. That's when you'd expect it to smoke the worse. Any ideas here? Still running 5w20 synthetic oil. Do these engines have a valve or anything that could allow for oil consumption only when fully warmed up? Thanks.
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Inside of the engine is probably the cleanest I've ever seen from looking into to oil fill. Engine oil stays super clean for a long time. Installed new PCV valve, no blow by when oil.fill cap in removed while running. That's why I'm thinking valve seals. If I let it idle warm for 5 minutes it will give a blue puff.
Fleet Owner
Joined: Aug 2010
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From: Reynoldsburg, Ohio
^^^I'd agree valve seals could be going away, the blue puff being the biggest clue I think. My experience has been the blue puffs that are most visible during the day's first start up meant fairly severe leakage sitting still for a time. Mind you that was mostly GM small block engines of various years, I'm sure Ford's Modular Motors are quite different in the valve stem sealing design.
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Update, I'm pretty sure it's the valve stem seals. I switched over to Valvoline 5-30 high mileage semi synthetic and after several hundred miles it's almost all the way cleared up. Now just to be clear, this engine has been maintained from the Ford garage it's entire life and has always had 5-20 synthetic oil changes on time. I think it's just a fluke that it started puffing oil, but once again, only after idling for extended periods, not first thing in the morning and for all I know it may only be one seal, who knows? Just wanted to say this so a guy with an old beat up engine doesn't think the high mileage oil is the cure. For me it's certainly helped.
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