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#1
05-01-2005, 12:15 PM
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Runs better prior to drive cycle
2000, Ford Windstar, 3.8 liter.
For some strange reason, when I reset the PCM by disconnecting the battery for about 10 minutes, the van seems to have better power and smoother shifting. A few days later, after completion of the drive cycle, it seems to lose a little power and not shift as smooth. No codes being thrown before or after drive cycle. Any ideas??? 
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#2
05-01-2005, 06:50 PM
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Re: Runs better prior to drive cycle
Well when you disconnect the battery you are in fact removing the "learned" values. This means that the PCM uses a factory default for these values until it re-aquires this data.
From what you describe it sounds like the "learned" data is making it run rough. Perhaps they are not good values based on bad input perhaps a bit in memory is stuck and the PCM reads somrth9ng diffrent then it stored.
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#3
05-03-2005, 03:09 PM
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I would be suspicious of an O2 sensor that is not healthy, they can be quite off and not set any codes
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