Buick Repair Questions? Ask a Mechanic for Answers ASAP
What is battery voltage while cranking. You can also access the crank sensor wire going into the pcm which would probably be easier to at least backprobe the wires and monitor voltage. It is the a and b terminals of connector 2 on the pcm is where the wires go. Here is a picture of sensor.
No, you dont need to remove the transmission and check the ac voltage output of the sensor. You can get to this sensor by removing the front wheel if its 2wd or the catalytic converter bolts if its awd.
The fuel pressure regulator is what allows fuel to go in the return line. But even if that was blocked it should only cause high oil pressure.....You tested the fuel pressure on the rail and it was good? Did you check for power/ground on the inhjector? Was your security/theft light on/flashing in anyway it wasnt before?
check the 15 amp fuel inj fuse under the hood in location 11 of the under hood fusebox.
There is not cut off before the fuel rail, here are replacement instructions and I would replace the fuel filter.
Well if you have no fuel at the fuel rail its a problem. Otherwise you can monitor ground pulsating at the pcm where the injectors go in, here is a wire diagram.
You can see the fuel test port in the middle of the two rails. I think you can access it from the edge under the intake. Here is a picture.
These vehicles do have alot of body control module related issues, so I'd assume thats the problem. I havent tried a used bcm but have been told it works but the security light is on since the vin's cant be matched up. They can only be programmed once on this vehicle. You can get a used one from www.car-parts.com sort by price and have them ship it to you to save money. I would also try to disconnect the airbag module to see if that helps. Let me know if you have questions, thanks.
They do have problems with the passkey sensors also, but usually turns on a check engien light or at the dealership they should see codes stored in the body control module. Let me know if you have questions, thanks.