2000 Pontiac Grand Am Running lean

2000 PONTIAC GRAND AM
88,000 MILES • 4 CYL • FWD • AUTOMATIC
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JRFITZ82
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  • 2 POSTS
I have had my car scanned and shows lean during accel. It also will not sit and idle it will sputter and die. Also with half a tank of fuel or less it sputters during take off and low RPM's. Fuel filter and pump where replaced 6 months ago but pump is cheap knock off.
Feb 11, 2010 at 10:01 PM
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MMPRINCE4000
  • ✓ASE Certified Mechanic
  • 8,548 POSTS
  • ASE Certified Mechanic
First thing to do is to check fuel pressure with mechanical gauge, pressure should be at least 40psi.
Feb 12, 2010 at 8:49 AM
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JRFITZ82
  • MEMBER
  • 2 POSTS
With key on and engine not running pressure barely hits 10lbs and roughly 32lbs while running....
Feb 13, 2010 at 5:55 PM
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MMPRINCE4000
  • ✓ASE Certified Mechanic
  • 8,548 POSTS
  • ASE Certified Mechanic
Remove the fuel pressure vacuum line and look for the presence of gas. If there, the FPR diaphram is ruptured.
If OK, hook up fuel pressure gauge, start, and then "blip" throttle, pressure should go up at least 5psi.

In any case the fuel pressure is low, but try the above and post results.
Feb 14, 2010 at 7:49 AM
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