SES light P0171 code - HELP

  • 75,000 MILES

I have a 2003 Grand Am with a 4cyl auto - over the last several weeks the car has been running like chit, I parked it downtown ran into a meeting returned 15 minutes later it wouldnt start - seemed to be a fuel issue, called for a tow, went back out 45 minutes later and it started like new.

SES light came on P0171

car runs great if it sits for 1 hour - not 59 minutes. If I attempt to start it before 1 hour I have to pump the crap out of the gas perdal to get it to start, then to keep it running same thing, after about 3 minutes it will drive normal again. BTW while it is trying to start during this process it often stops running with a 'thud' or 'clatter' very rough, once it starts good to go.

replaced fuel pump, cleaned MAF sensor, replaced fuel sending unit, fuel filter, plugs, changed service stations for gas.

nothing is working, I work downtown portland and have to move the car several times for my job, its a bitch to constantly deal with this - I have seen several folks talk about MAF, PCV, O2 - any advice would be appreciated.

Do you
have the same problem?
Monday, February 27th, 2012 AT 9:14 PM

1 Reply


Lean fuel condition could be caused by one of the following below:

1. Vacuum leaks

2. EGR and PCV valve.

3. Low fuel pressure.

4. Dirty fuel injectors.

5. Mass Air Flow Sensor.

6. Oxygen Sensor.

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Monday, February 27th, 2012 AT 9:22 PM

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