Mysterious miss

[88Racing]

Thanx Bill and Jack for the info.

Get this if one part of the commitee is not communicating correctly during the shut off of the vehicle it can lead to a dead battery! Had a Ford Fusion that a lady kept having dead batteries in. Replaced the battery 3 times and the altenator 1 time, over a 3 week period.

Finally at the end of its rope. Had it hooked up to a computer for 2 days and 2 nights, while Ford monitored it. Finally a Ford engineer called and told us to look at the back of the radio and guess what it was a lose connection to the sirius module.

This is the way it was explained to us. The pcm is still the brain during start up and shut down. During shut down it contacts all the other modules to make sure they are ok. If one doesn't respond it wakes everyone else up and goes through the same process all over again. Thus the dead battery, because of the continuous cycling. And with an intermitent connection like the sirius module was, its like a needle in the haystack. Sometimes the connection was there and sometimes it wasn't. No problems every since then. We have also experienced the same problem with a gmc envoy except that one involved the transfer case.

Lars