I have a Pontiac 2000 Grand Am that keeps stalling on me when I am driving. Do you know what it can be?

Question

Normally does it when I'm climbing a hill, going 60+ mph, has low rpm and it will just cut off on me while I’m driving. MOST of the time if I drive around 50 it's okay. When it turns off, sometimes it will crank again, other times it won't. I have replaced the fuel receptor (?), flushed the fuel lines, cleaned the injection heads, and changed the ignition modulator and I'm still having problems with it. Is it the computer or the crankshaft sensor or the fuel pump? Or is it something else? And just for some people, it's NOT the battery. Any input is welcome. Thanks

Answer 1

It might be the crank or cam position sensor. Both are necessary to make sure the motor stops if it jumps time or if the timing belt breaks.

Unfortunately unless you have access to the machine they plug your computer into, the only way of telling is to swap them out. They do tend to fail when the engine heats up - I have had this happen on a few occasions. There's always the possibility that it is the computer, but like I always say - start with the cheap parts, if nothing else seems to work, you can try finding a computer in a junk yard (but by that time you should probably find someone who can hook yours to the machine, and see what is up.

Another possibility if it isn't one of those two sensors is the ignition module - take some tools with you, and if it stops, try pulling out a plug - hook it back to the wire, and have someone crank the the engine while you hold it against the block to see if you are getting spark - if not, then you may have a bad ignition module.

Answer 2

This year Grand Am had a problem with the fuel pump.
I replaced plenty of them.
It could very well be the problem with the car.
But it could be any number of things. It could be a wire harness shorting out. It could be a crank sensor. The computers weren't too bad about giving problems on these cars.
Good luck!

Answer 3

Will it crank with a jump? You can check the negative ground wire from the battery, and the postive from the battery to the starter. First clean these connections to see if it makes any difference. In the driveway, you can try jumping your car from another vehicle, first by connecting to your battery posts, then by-passing these wires and connecting to the block, then the starter. Otr tets the wires with a elctric multi-meter.