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1997 Jeep TJ OBD Code P0171 Too Lean Mixture

Tiny
MNURUDDIN
  • MEMBER
  • 1997 JEEP WRANGLER TJ
  • 6 CYL
  • 4WD
  • MANUAL
  • 90,000 MILES
I recently started getting very poor gas mileage. Less than 10 mile per gallon. I get a P0171 code when I hook up a code reader.

Where should I look for a the problem. Oxygen Sensor? Vacuum Leak? Somewhere else?
Saturday, March 21st, 2009 AT 10:50 AM

3 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
You may have a vacuum leak, get a can of spray throttle body cleaner, spray the vac lines and maniflod area, when the idle changes, youve found the leak! You want the engine running and spray on the outside but do direct the stream onto the hoses, if it is a vacuum leak, the engine idle will change speed, then you have detected a leak, repair the vacuum leak and see how it runs!
The 02 sensor may also be bad they are said to be 100,000 mile parts, your close to that, MAF and leaks in the air duct system can cause unmetered air to bypass the MAF, causing the PCM to add more fuel to compensate. I can send a PDF on vacuum leak detection using scan tools, but I need an email address.
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Saturday, March 21st, 2009 AT 11:00 AM
Tiny
MNURUDDIN
  • MEMBER
  • 2 POSTS
Please send the PDF on Vacuum Leak Detection to mnuruddin@cfl. Rr. Com
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Saturday, March 21st, 2009 AT 2:48 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Sent!
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Sunday, March 22nd, 2009 AT 10:37 AM

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