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Old 11-16-2012, 02:17 PM   #1
VA04XTMT
Scooby Newbie
 
Member#: 240117
Join Date: Mar 2010
Location: VA
Vehicle:
07 FSXT
UGM

Default Another p0171 thread

Did not want to start a new thread but my situation is a little different. I pulled this from another thread from the tuning section because its more approprate here. So here we go.
I keep getting a p0171 about 20 miles after I fill up the car w/ gas. Car has a Cobb Accessflash tune that was completed in Plano a little over a year ago for the former owner. The car is now in Virginia. I have had it fogged twice to look for vaccum leakes and cleaned the maf sensor. It seems to throw the code more now that the weather has turned colder it only did it once this summer. There is an idle issue has existed since I got the car back in June. Sometimes it will idle fine at about 600rpm other times its up/down. On a usual basis, It will rev up to 1500-2000 and down to 500 about 3 times and then settle at 600 when coming to a stop. At times it will die. Also seems to be consuming more fuel. Also motor was rebuilt @ cobb when it was tuned so all maintenance parts are fairly new. I do not have an AP to collect data. So what's my next move. Also, I do not want to chase my tail with switching out parts if it is a tune issue. But it should not be a tune issue, the ecu should be able to compensate for the environmental change, right?

Last edited by VA04XTMT; 11-16-2012 at 02:25 PM.
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Old 11-16-2012, 02:46 PM   #2
HinshawWRX
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Location: Common Sense, VA
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2014 Porsche
GT3 (Currently on Fire)

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Old 11-19-2012, 09:38 PM   #3
VA04XTMT
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Member#: 240117
Join Date: Mar 2010
Location: VA
Vehicle:
07 FSXT
UGM

Default

Thanks for the link. How do I determine if its the O2? I had the car on a scanner and the readout for the O2 was 2.78 and did not fluctuate much at all. What does this mean?
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Old 04-09-2013, 11:04 PM   #4
VA04XTMT
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Member#: 240117
Join Date: Mar 2010
Location: VA
Vehicle:
07 FSXT
UGM

Default

I wanted to update this thread. I installed new front O2 sensor ($140) The car did not throw the p0171 for over a month but, it came back.
As long as the car does not idle for more than a minute it does not throw the code. But, if it idles for more than a minute or so, it throws the p0171. Also, I have a gas/exhaust smell that comes in through the vents when at idle or anytime I stop while driving. While the car is in motion the smell does not come through. So, to summerize. The car has been fogged twice so no vacuum or boost leak, cleaned maf, changed o2, cannot identify any exhaust leak. Other than getting a new tune can anyone add any guidance here?
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