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Sure its not blue smoke? these cars are notorious for oil burning. The puff of smoke after accelerating from a long idle sounds like oil.
97 prelude doesnt use MAF, uses MAP. MAP should read less than .9 volts at idle. Really around .88 ish volts. Anything above that, the ecm will likely be adding extra fuel thinking there is load on the engine.
Ecm mainly runs off MAP sensor for the base of injector duration. Uses the O2 sensor to fine tune the fuel trims
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Don't open your hood to strangers........ N 'ouvrez pas votre capot à des inconnus
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