Hi all
I have a 1994 buick century with a 3.1 liter motor. I would like to know what the fuel pressure is supposed to be on the car? I bought a tester but I'm not sure if its supposed to be hooked up and just turn the key to the on position or is the car supposed to be running.
I have changed the spark plugs, air filter, fuel filter, Idle air control valve (it was sticking). No trouble codes. Sometimes the motor runs a little rough and I have found the fuel mileage have decreased a little. Possible GM gremlin.
Pete