I have an 89' Grand Prix with 3.1 EFI with about 185K miles.

I had the vehicle running two days ago, parked it, and then the next day it wouldn't start. The battery and starter are good, as it cranks over without a problem; however the engine will not fire. I sprayed some ether into the intake, and it still wouldn't fire, which leads me to believe it is an ignition problem.

Any suggestions?

Thanks,
Andrew

 

I just went through this with my '88 change your crank sensor