Thread: 1990 Lumina Hesitation / "putt" @ idle
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Old 02-02-2009, 02:21 AM   #2
Bearwulf
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Re: 1990 Lumina Hesitation / "putt" @ idle
Have you changed fuel filter yet?
According to the GM Lumina service manual fuel pressure should be between 40.5 & 47.5 PSI on the 1st generation 3.1 MPFI engines (the one I refer to is one borrowed from the Chev dealer shop). Resistance @ injectors should be 12 +/- .28.
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