I was wondering if you could help me out here.
I have a 2000 Buick Century 3.4 with a frustrating problem.
When the car is running the dash lights (all of them) randomly come on
and off driving or sitting still and the needles on the dash will
randomly go all the way up then all the way down. No codes stored in
computer and communication with computer is good. I am using Matco
pro scan plus to read PCM and BCM data. When I connect the scanner
the car it does not act up at all. I checked all power and grounds I
could find using a power probe and they seem good.
Battery is new and alternator seems good.
Readiness monitors are good but Oil life keeps resetting it self.
The fact that it will not act up when the scanner is plugged in and
reading PCM leads me to believe it is the PCM is Bad.
If anyone has run into this or has an idea for me let me know please
because I want to know I am right before I buy the PCM cause it is
kind of expensive.
Thanks in advance,