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2000 Pontiac Grand Am Running lean

Tiny
JRFITZ82
  • MEMBER
  • 2000 PONTIAC GRAND AM
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 88,000 MILES
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.
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Thursday, February 11th, 2010 AT 10:01 PM

3 Replies

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
First thing to do is to check fuel pressure with mechanical gauge, pressure should be at least 40psi.
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Friday, February 12th, 2010 AT 8:49 AM
Tiny
JRFITZ82
  • MEMBER
  • 2 POSTS
With key on and engine not running pressure barely hits 10lbs and roughly 32lbs while running.
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Saturday, February 13th, 2010 AT 5:55 PM
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
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.
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Sunday, February 14th, 2010 AT 7:49 AM

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