I have a 1991 camaro rs, 3.1 ltr, V6 and my problem is in the morning it has to crank for a good 20-30 seconds before it starts. Once I see the oil pressure come up on the car it will start. I have replaced plugs, wires, rotor cap and button, fuel filter. Check timing and fuel pressure (MPFI), looked for fuel pressure lose, replaced oil pressure sending unit and still in the morning or after it has sat for about 5 hours it has to crank forever to start. Once it starts it runs great and will start evertime after that within a second or two. Need help or an idea to go next?? Using the troubleshooting (BIT) on the car it will flash code 54 and I have a constant check engine light?

hillbilly: just a couple of ideas . Could be an engine coolant tempature sending unit problem , not giving you any cold start enrichment , or if its an injected engine you could be having a leak down problem ( injectors , fuel pump , fuel pump check valve) . let us know how you made out , good luck

I believe code 54 is low fuel pump voltage. When you first turn the key on listen for the pump to run for two seconds. If it doesn't then you'll have to break out a DVOM (volt meter) and a wiring diagram and check your feeds at the fuel pump relay. The system primes the fuel pressure with the relay to give you initial starting pressure. After that the oil sending unit makes contact and supplies the voltage to the pump after it reaches 5psi+. Sounds like your not getting the initial starting pressure and are having to spin it until the sending unit can put power to the pump. The ECM provides the ground to the relay for the two seconds. It will probably start easier during the rest of the day because the engine gets oil pressure quicker after being run and the lines are full of fuel and probably under a little pressure still.

Turn ign key to on, listen for fuel pump hum from tank, should have fuel squirting from pressure port on fuel rail, a Schrader valve.

After cranking, remove spark plug and check plug for wetness of fuel, as 69 Ragtop suggests, if coolant temp sensor is not working, ECM won't give cold temp fuel enrichment. You should look for a sensor with two wire connector somewhere around the thermostat housing, remove it and check for corrosion and remove same with alcohol. If you or a friend has a DVM< check with Ohms function the sensor, should read about more than 2000 ohms in this heat& humidity. Also, read with ohmmeter into the wire harness back to the ECM to make sure there is a signal path, go across both wires, should be more than 15,000 ohms, then each wire to ground, should not read anything less than 2 ohms, more like 100,000 ohms.

There is a wire on the ALDL connector for fuel pump, and there is 12 Volts, I don't know what pin letters thet are, but, Library would have reference manuals, and one could hot-wire the fuel pump as a troubleshooting aid. If you have a gauge, attach it to the fuel rail at Schrader valve, and should have at least 40 PSI, it will bleed down over time, say 1/2-1 hour.

Are you getting spark? Library would also help in obtaining copy of ECM codes, as in your 54.

Everett 68/350/PG/11.90/115mph

Thanks for all the help guy's, I'm good to go now......

Bad fuel pump relay. Fuel pump uses oil sending unit to bypass relay in the event that the relay should fail. So in the morning you have to wait for the oil sending unit contacts to close so power will go to fuel pump. Old gm trick that was on all fuel injected gm cars and trucks.

Funny thing is ford does the opposite and shuts power to the fuel pump if the oil sending unit contacts open. It suposed to save the engine if the oil pump fails.