2003 Ford F-150 Hesitation with moderate-heavy acceleration

MICSTIFFY

MEMBER
2003 FORD F-150
V8
2WD
AUTOMATIC
60,000 MILES

These are the trouble codes: P0125, P0171, and P0174.
I have replaced the fuel filter, O2 sensors, cleaned the MAF, and checked for air leaks on intake (however, not sure if I missed some). The problem usually arises when I give her some gas. Then the exhaust rumbles and the power is not supplied to the vehicle (acceleration). It seems that there is too much oxygen being supplied hence the improper combustion and hesitation/lack of power. I can't figure out why though. After doing research I'm guessing it's the MAF, iat sensor, temp gauge, EGR valve, or a gasket.

5 Replies

JAMES W.

MECHANIC
2,394 POSTS

It's either the MAF or the crankshaft position sensor. I'd check the MAF first.

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Tuesday, April 6th, 2021 AT 12:42 PM

MICSTIFFY

MEMBER
3 POSTS

I took it in to have it diagnosed and the mechanic checked the fuel pressure before the fuel regulator and it was only at 20lbs. It's suppose to be at 35-50 so we're thinking its the fuel pump. I wish is was the MAF because it would be a lot cheaper. However, it still could be either of those sensors. We'll see. Thanks,

Jeremy

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Tuesday, April 6th, 2021 AT 12:42 PM

JAMES W.

MECHANIC
2,394 POSTS

Jeremy, low fuel pressure can trigger a lot of other problems that may dissapear once the new pump is installed. Don't feel alone, we get a LOT of posts with Ford fuel pump problems. Let us know how it pans out.

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Tuesday, April 6th, 2021 AT 12:42 PM

MICSTIFFY

MEMBER
3 POSTS

Thanks a lot James. I really hope this expensive fix resolves the problem. Thanks for your help and I hope this will help other people with similar problems.

Jeremy

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Tuesday, April 6th, 2021 AT 12:42 PM

JAMES W.