1996 F150 hard start when warm. P0171 and P0174 - Page 2 - Ford Truck Enthusiasts Forums



1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

1996 F150 hard start when warm. P0171 and P0174

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  #16  
Old 02-19-2011, 10:07 PM
ididntdoit89 ididntdoit89 is offline
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it is the fuel pump... you need a new one, not the auto zone one but either a motorcraft or the dealership one.
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  #17  
Old 06-30-2011, 01:15 PM
aragan aragan is offline
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1996 F150 hard start when warm. P0171 and P0174

I've had the same problem with my '96 F150 4.9 with duel tanks, but the problem is when warm starting from the rear tank only. If I flip the tank switch to the front tank, it runs fine. Befor I realized it only had warm start problems on the rear tank, a shop replaced my distibutor, repaired a vacuum leak but a smoker revealed no more leaks. Then when we knew it was a rear tank related problem, they replaced the rear fuel pump, but it still sounds like it's starving for gas on a rear tank warm start???? Any suggestions?
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Old 02-03-2014, 09:16 PM
sandkpatterson sandkpatterson is offline
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Tree Vacuum

Does anyone know the name of the vacuum tube in the intake manifold is called? Auto Zone can't find it but my power brake booster is plugged into it and fuel pressure regulator is plugged into it. Like to replace it but it's not called a tree vacuum at the store. Help!!
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Old 03-25-2014, 08:11 AM
frankt9317 frankt9317 is offline
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Quote:
Originally Posted by Irv Nichols View Post
I have the same pickup with the same problem but my truck has dual tanks when i start it hot on the front tank it shakes and skips like hell but if i just flip the tank switch to the rear tank the truck smoothes right out compared fuel pressure between frt and rear tank and frt is 7lbs lower also if i reset the ck engine light and just run on the rear tank the truck runs fine and never sets the codes or light again hope this helps Irv
Same here, I have a 302 v8 and it does the same thing
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  #20  
Old 03-27-2014, 04:04 PM
silver38 silver38 is offline
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have a ford 150 v8 showing code PO 172
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150, 1996, 300, 96, code, cyl, f150, ford, hard, hot, lean, po171, po174, start, starting

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