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Old 01-01-2010, 06:54 PM
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Biodiesel300TD Biodiesel300TD is offline
Join Date: Dec 2004
Location: Albany, OR
Posts: 4,845
Leaking valve stem seals usually causes smoke on start up that goes away after a bit. If you are getting lots of smoke all the time the valve stem seals probably aren't the culprit. I would check the valve clearances, and run a couple cans of diesel purge through the engine. On these cars the valve clearances tighten over time which cause the valves to not close fully, which can lower compression numbers.

There isn't much you can do about blow by other than rebuild the engine.

With compression number like that you are doing pretty well. The one cylinder with 23bar is going to cause rough idling, more than anything. I'm a little surprised you have much blowby and smoke with compression numbers that high.
23 bar = 333psi
27 bar = 391psi

Is the ALDA cranks up to high? What color is the smoke?
'04 Jetta TDI Wagon
'82 300TD ~ Winnie ~ Sold
'77 300D ~ Sold
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