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Old 12-28-2018, 06:58 AM
StephenVA StephenVA is offline
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Is the #1 plug oil fouled or wet fouling by a faulty injector? A pressure test on the fuel system at rest will expose a leaking injector.
Question: Does this vehicle smoke when warming up or at an idle for more than a few secs? Does it puff oil smoke on idle to hard acceleration? Smoke after idling for 10-15 mins? The last one is valve seals....

Time to do a compression test on a few cyls to determine internal engine health. Oil splashing fouling maybe your symposium to a larger issue. Once warmed up and the oil burned off, the engine runs normal? Inserting a bore scope through the plug hole with the piston all the way down in the cyl will expose the cyl walls. Look for vertical scaring in the walls for busted rings etc. Engine ever run way too hot in the past?

If compression is good, look for valve stem seals cracking and wear. A compression test does not expose this issue only a visual will.
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2005 X5 4.8IS
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