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It would help diagnose it if you could read the smoke in addition to saying under acceleration: White? Grey/black? Mostly first thing when cold? You should also read the spark plugs: Black? Tan? White? Plenty of places online with pics to help.
White smoke first thing only and lasting maybe 5-15 mins can be condensation in the muffler, especially the rear, usually with dripping water out the tailpipe unless it's angled up. White smoke starting and continuing when the engine is hot can be a head gasket leak -typically you'll be topping up fluid more often, like every few weeks (if you suspect that then open the rad cap and warm the engine until the thermostat opens and see if it suddenly rises -see if it can run for another 5-10-15 mins without suddenly boiling up.
Yes, could be valves, like worm stem seals. Bad rings in high mileage B230F are less common. You would want to do a compression check and a leakdown check. B230F is a non-interference engine so you don't have to worry too much about bent valves.
Could also be your simply running too rich (the plugs should tell you). Is the engine idling and running fairly smooth, like what was normal. Read out the OBD diagnostic socket to see if there are any codes on port 2 (fuel) or port 6 (ignition) -see the Engine OBD section in the FAQ here. The O2 sensor could be a suspect -see also the FAQ. Black smoke first thing could be leaking injectors -see FAQ. You may or may not also have a cold start injector on the intake manifold pointing, mor or less behind the throttle body.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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