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Code P0171

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Old Jan 21, 2011 | 06:58 PM
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cltaylor
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Code P0171
I have a 2001 Ford F150 engine light came on, code P0171. Idles rough and gas stinks. Changed out PVC valve and hose, changed IAC valve, cleaned MAF sensor, checked all hoses for leaks. Still idles rough and gas still stinks and light is still on. Any suggestions?
 
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Old Jan 21, 2011 | 07:06 PM
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Wilber15
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Could be bad cat? Disconnect cat at exhaust manifold, see if idle smoothes out. could also be exhaust leak at the exhaust manifold drawing in o2. intake leak? bad injector(stuck closed).
 
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Old Jan 21, 2011 | 07:29 PM
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Welcome to FTE cltaylor

I've moved your question to the right forum for you. The guys here should be able to answer it for you.
 
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Old Jan 21, 2011 | 07:34 PM
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fz1dave
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Another possibility is leaking intake gaskets.
 
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