2003 Ford F150 Hesitation with moderate-heavy acceleration

2003 FORD F-150
60,000 MILES • V8 • 2WD • AUTOMATIC
Avatar
MICSTIFFY
  • MEMBER
  • 3 POSTS
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.
Mar 30, 2009 at 11:00 AM
Advertisement
Avatar
JAMES W.
  • ✓Experienced Mechanic
  • 2,394 POSTS
It's either the MAF or the crankshaft position sensor. I'd check the MAF first.
Apr 6, 2021 at 5:42 AM
Avatar
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
Apr 6, 2021 at 5:42 AM
Avatar
JAMES W.
  • ✓Experienced 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.
Apr 6, 2021 at 5:42 AM
Avatar
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
Apr 6, 2021 at 5:42 AM
Avatar
JAMES W.
  • ✓Experienced Mechanic
  • 2,394 POSTS
We get an overwhelming number of problems on Ford fuel pumps, especially on the trucks. Let us know how it goes and we can pass it on to others.
Apr 6, 2021 at 5:42 AM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle