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Hard starting?
- Thread starter i973eat1
- Start date
foxwar71
NAXJA Forum User
- Location
- Foxboro, MA
rear O2 has nothing to do with it, its only function is to minitor the cat. try cycling tye key on and off a few times without starting it. then try to start it. if it fires right up, you probably have a bad check valve and the fuel lines are losing pressure when you shut it off.
- Location
- MilkyWay Galaxy
Get a second person to crank it, and pull and check one plug wire (if you have them, on the 99?) for spark.
NO spark is usually a bad CPS.
Scan it for codes.
Check the fuel rail sample port for fuel, and check the fuel pressure with a fuel pressure gauge at the port on the fuel rail, should be 49 psi.
And, the O2 sensors are not used to start the engine.
Lastly, if you have spark and fuel, try holding the gas peddle to the floor, do not pump the peddle, and crank. If it starts, then you have a leaking fuel injector dumping fuel, and flooding it.
NO spark is usually a bad CPS.
Scan it for codes.
Check the fuel rail sample port for fuel, and check the fuel pressure with a fuel pressure gauge at the port on the fuel rail, should be 49 psi.
And, the O2 sensors are not used to start the engine.
Lastly, if you have spark and fuel, try holding the gas peddle to the floor, do not pump the peddle, and crank. If it starts, then you have a leaking fuel injector dumping fuel, and flooding it.
