Sometimes when starting the car (2000 alero) the trunk pops or it will start and the tach goes haywire and it turns off. Other times it act as if it has a dead battery even if it is completly charged.the rear defrost doesn;t work and it sometimes runs hot. We have been told by several technicians the pcm is bad I still would like one more opinion.
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Its time to replace the battery. This is common in Chevy cars, if the battery goes bad it doesn't hold a charge anymore. Whats happening in your case is the low voltage isn't keeping the trunk relay closed. When you turn the key all the juice goes to the stater and lets the truck pop open. Just to prove my point, give it a jump start and it will fire right up and the trunk will stay closed.
your tach is run by the engine computer, possible cause. also by the crankshaft position sensor, most likely cause, I would start there. some sensors will run within perimeters and be bad enough to cause a lot of problems
COULD BE GROUND PROBLEMS OR THE TACH GOING BAD.EVEN THOUGH CAR SEEMS TO BE RUNNING GOOD IDLING GOOD.SOME TIMES A SPARK PLUG MISFIRE.CAUSING A LITTLE ROUGH IDLING CAUSING TACH NEEDLE TO GO CRAZY.I SEEN ALTERNATOR WITH VOLTAGE REGULATOR GOING BAD CAUSE A POWER SURGE CAUSING HEAD LIGHTS TO DIM A LITTLE THEN BRIGHT WHILE ENGINE IDLING.THIS WILL CAUSE TACH METER NEEDLE BOUNCE AROUND ALSO.
I had this problem with my 1999 alero i took it apart and investigated it myself because i have been a mechanic for 25 years now but i had to replace the starter relay the whole ignition system and believe it or not new valves. After I replaced all of those my alero drove better then eer and the lights never went back on or any of the other lights....
I'd probably start with cleaning my connections at battery, & making sure my battery has a full charge. If not cured, maybe a new battery is required. If it will start with a jump, try running it for a couple of minutes with boosters on, and if all appears o.k. , change your battery.