I have had this problem for a while.
When driving the engine will stop. I have to pull over and it will usually start right up. There have been a couple of times though that it didn't. When that has happened I have been able to leave it for a few hours, when I come back it starts right up.
The problem came back a couple of weeks ago. It went away for the winter.(Utah) I don't know if it has to do with it being warmer but that is what it seems like.
The check engine light does not come on when this happens. I took it to Saturn and they didn't find anything wrong with it but suggested I replace the key tumbler. They said that there was a TSB where the tumbler went bad. The key was getting hard to turn so it made sense that it could be part of the problem. The key does turn like new but the engine will still dies while driving.
I have replaced:
- fuel filter
- Crank position sensor
- Ignition tumbler (part the key goes in)
- Ignition module (part that is under the coil pack)
- ERG about a year ago.
Would a bad coolant temp. sensor do this?
I'm suspicious that the PCM may be bad. Is there a way to actually test it? I don't mind taking it back to Saturn if they can actually fix it. I'm just concerned that I'll keep buying parts and more parts and...
Thanks for the help, Jeff