going down the highway the other day i was steadily doing about 60mph
when my speedo started going down. I put the pedal to the floor to try
to speed back up, and just kept decellerating down to about 40mph. I put
it in neutral to rev it up thinking maybe it was carbons or something
and when i revved it up there was no power to the motor then the dummy
lights all came on and the car died. Still coasting down the highway in
neutral, the car fired right back up and ran fine the rest of the day!
What the hell kind of problem could this be?? some kind of sensor
maybe? the car is a 1990 olds calais/ 2.5 tech 4 engine
Any replies greatly appreciated
There are lots of ground and positive positions that can do this IF it is
Normally, you would start at your battery cables and work from there. An
connection can give you a ton of trouble.
Sometimes the darn cables themselves are at fault. GM makes battery cables
two or three main cables connecting at the battery. Inside the battery
those cables corrode and you lose power to one or more functions of the
engine control system.
There can also be bad connections at the plug to the PCM (powertrain control
module), etc. They
may not always be bad, but may go bad on the rare occasion. Using
dielectric grease on the terminals
helps keep them functioning.
Sometimes the computer modules themselves have components which have nervous
under temperature and load. These are damn difficult to find, because they
often recover before
you can isolate them.
Same goes with ignition control modules, crankshaft sensors, etc.
Have someone run the codes on your OBD system and see if you are lucky
enough to have set
a code. If not, it may be a long row to hoe before you find the culprit.
And although I feel it may be
in the electrical system, there could be other things involved as well.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.