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2001 Ford F-150 Engines hesistates at 1700 RPMs to 2200 RPMs

Tiny
MNOVELLI
  • MEMBER
  • 2001 FORD F-150
  • V8
  • 4WD
  • AUTOMATIC
  • 16,400 MILES
My truck hesistates at 1700 rpms to 2200 rpms. I used to have codes po171 and po174. But fixed them by replacing the TPS. Also in the process I ended up replacing the MAF as well. The fuel filter has about 15,000 to 20,000 on it. Also, when its hot out the problem is worse. Any insight would be great. I'm thinking it might be fuel pump or pressure regulator, not sure though.
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Saturday, July 24th, 2010 AT 4:30 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hi mnovelli, Welcome to 2carpros and TY for the donation

Some of your possibilities- Inspect and test all the following listed below:

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Knock sensor
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard it.
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Saturday, July 24th, 2010 AT 6:56 PM

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