I was starting to have random problems(temp guage went to hot immediately, gas guage quit working, after about a week temp guage stopped working at all, engine/transmission temp light came on). Then the car wouldn't idle when cold. I pulled the PCM and found corrosion from the battery on the side of the PCM. I bought a PCM from a junk yard and installed it, but the car would not start. I was reading another thread about flashing the PCM. Is this what I need to do?
In desperation, I cleaned the corrosion off of the old PCM and re-installed. All of the problems were gone. Now about a month later, I am starting to have idling problems again.
Any other ideas???

 

?? Maybe clean the connections again ?? Other possibility is a worn/bad connection in the PCM hookup itself .....

 

White vinegar and a small brush or cotton swabs will go a long way toward cleaning battery corrosion off of the terminals. When clean coat with (I think it is called) conductive grease. Sold at auto parts stores in a tube used to electrical connectors in cars including light bulb sockets and all, will help prevent further corrosion. I first saw this stuff to be used on points when changing them in distributors. Since then wider usage in all automotive electrical connections.
I keep a tube of this around all the time to re-coat pins and such when I unplug a connector or change a light bulb.

 

that would be known to us youngins as dielectric grease

 

It's called "dielectric grease" ....it's non conductive

 

It's called "Non conductive or Dielectric" grease

 

Thank you for re confirming that for this 9 year old post.

Twice.

Closed.