Will a PCM "Learn"?

From : jm jim muller earthlink net

Q: just replaced the pcm in my 93 ram van 5.2 l i was getting an error that #5 injector was not returning a signal. replaced with a pcm from a 95 ram truck 2wd with the 5.2 vehicle started right up roughness cleared up but on test drive while still cold had hesitation and a backfired through the throttle body a few times. seemed to clear up as i drove and engine warmed up. will the pcm learn my vehicle or should i be looking at timing distrubutor etc... just curious .

Replies:

From : steve lusardi

assuming all the sensors are functional both the fuel map and spark map selections will be learned. steve just replaced the pcm in my 93 ram van 5.2 l i was getting an error that #5 injector was not returning a signal. replaced with a pcm from a 95 ram truck 2wd with the 5.2 vehicle started right up roughness cleared up but on test drive while still cold had hesitation and a backfired through the throttle body a few times. seemed to clear up as i drove and engine warmed up. will the pcm learn my vehicle or should i be looking at timing distrubutor etc... just curious .