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PO171 and PO174 codes

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Old May 8, 2010 | 01:09 PM
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PO171 and PO174 codes
I have p0171/p0174 code on 96 f-150 4.9 300. I have replaced the map sensor,egr valve, fuel pressure sensor, and intake gasket, and have sprayed starting fluid to check for vacuum leaks none found. what Im going to do next is spray carb cleaner into the intake to clean any carbon build up because the ford place didn't clean it out
 
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Old May 9, 2010 | 08:49 AM
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I v got that to and can't find it
 
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Old May 9, 2010 | 09:04 AM
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Clean MAF sensor and check for leaks in the Thermactor smog system if so equipped.
 
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Old May 9, 2010 | 02:06 PM
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Its a new MAF sensor and where do i look to see if i have a smog system. i live in NC.
 
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