Question about 2000 GMC Safari
2000 gmc safari my van idles fine for 5min when i hit the gas it backfires though the intake fuel pressure it @50 psi but it goes up and down do you think it might be my fuel pump or camshaft sensor.
i changed plug/wires/cap/rotor/fuel filters.
any help would be greatly appreciated
The fuel presure should be at least 60- 66 psi key on engine off, and then drop some when started, if it doesn't go any higher than 50 psi that would explain your backfire concern. If it is low then the fuel pump is weak. I have also seen soot on the little wires inside the Mass Airflow Sensor cause a concern like this.
Posted on Nov 18, 2008
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