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telesquirt
 Post subject: 1997 ford expedition p0171 p0174
PostPosted: Mon Feb 09, 2009 8:48 pm 
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i have a 5.4 motor just put spark plugs in because i a misfire in #4 cylinder i even replaced the fuel filter cleared codes with scanner on the way home the check eng light came on checked got code p0171 and p0174 what else could be wrong any help please thanks eric
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 Post subject: 1997 ford expedition p0171 p0174 
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Mohawkmtrs
 Post subject: Re: 1997 ford expedition p0171 p0174
PostPosted: Tue Feb 10, 2009 9:45 am 
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Joined: Sat Sep 09, 2006 4:26 pm
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Location: Tyendinaga Mohawk Territory, Ontario
Check for vacuum leaks, particularly the intake nozzle and the PCV Valve and its hoses where it goes into the throttle body.

Check/clean MAF.

Check fuel pressure.

Good luck and keep us posted.
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