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Re: 98 Grand Prix - Hard Starting and Higher Than Normal Fuel Consumption
How about the fuel filter? How old is it or when was it last replaced?
You can check fuel pressure at the front fuel rail Schrader valve located towards the supercharger snout. 48-55 psi. Low fuel pressure may cause a lean trim mode so the PCM will compensate by adding more fuel to the fuel injection system to compensate.
Also, remove the vacuum line at the fuel pressure regulator and check for raw fuel indicating a ruptured diaphragm. A flaky fuel pressure regulator may cause longer than normal starting but the fuel pressure check will test it. Check at fuel pump prime, at idle and with the vacuum line at the fuel pressure regulator on and off. Readings will vary as you do this.
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