[Etnier]

[quote name='flash' post='35715' date='May 21 2007, 09:15 AM']any chance you did a leakdown test along the way? while it is very common to try to make a direct connection to an item when changes are being made, it may not be actually connected



i would start with the basics - verify compression at over 180, verify leakdown at below 10%, verify function of variocam - verify function of O2 sensor (new or not) - then check mixture - it sounds like you are running very rich



have the injectors been checked or serviced? do you smell fuel anywhere at any time?[/quote]



I checked compression: it was fine. My mechanic said that obviated the need for a leakdown test. Vacuum has been good. I will keep investigating, with thanks for these tips.

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[flash]

these kinds of problems make me crazy - i feel your pain



good compression does not obviate the need for a leakdown, but it does lessen the liklihood of a big problem (assuming it was over 180, and vacuum at 18 or so at idle, and rock solid)



i would be looking to find the cause of rich running, and not one to assume anything, i would check everything, if only to eliminate it as a possiblity

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[Etnier]

It seems like a Run-Rite treatment (2nd treatment in a year) applied a couple of weeks ago has solved the black soot problem. Not anything I would have expected!

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[flash]

that stuff is amazing

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