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My old wagon, NA/standard, has 110k on a rebuilt B21f with Jetronic-K injection (everything standard equipment). It uses a quart of oil around every 600 miles, but no visible smoke...
EXCEPT--sometimes when I stop just for a moment, say at a stop sign, then start off, the engine knocks loudly (the only time it knocks, otherwise it's happy on regular) and it lays down a major smoke cloud. Makes me look like a one-man ozone hole.
Then I can drive away and it runs like there's no problem. This happens only after the car is thoroughly warmed up. It also doesn't happen most of the time--just at random moments when I'm not expecting it.
What's going on here?
Thanks for any help you can provide.
Doug Harvey
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