Question about Ford F-450

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2000 Ford F450 with V10 engine starts and idels fine. However it stumbles and hesitates with any acceleration. Replaced tps sensor, maf sensor, both O2 sensors, fuel pump, and both strainers. I am stumped!! Please help!

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  • Anonymous Mar 21, 2014

    runs rough;y, hesitates on acceleration

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Have you cleaned the throttle plate? this is done by removing air intake hose and spraying out with cleaner and wiping it down open throttle and wipe off the butterfly and bore. this will usually cure a stumble.

Posted on Aug 20, 2008

  • martin johnson
    martin johnson Sep 04, 2014

    mine will not go over 30 mph idels fine but lack of power its a 2005 f450 v10 motor it is our brush truck for fire dept its been to dick edwards but could not figure it out please help

  • martin johnson
    martin johnson Sep 04, 2014

    we have replaced dang near every sensor there is on the truck wee replaced the fuel pump ,filter and presser regulator cam sensor temp sensors throttal sensor nothing is working

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PO300 PO171 PO122


DTC P0300 - Random misfire... means that the the car's computer has detected that not all of the engine's cylinders are firing properly. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

Symptoms may include the engine may be harder to start, the engine may stumble / stumble, and/or hesitate or other symptoms may also be present

A code P0300 may mean that one or more of the following has happened:
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Stuck/blocked EGR valve / passages
Faulty camshaft position sensor
Defective computer


DTC P0122 - Throttle Position Sensor/Switch A Circuit Low Input... means that the the car's computer has detected that the TPS (throttle position sensor) is reporting too low a voltage. On some vehicles that lower limit is 0.17 - 0.20 volts (V). Did you adjust it when you installed it? If the signal value is less than .17V then the PCM sets this code. Could be an open or a short to ground in the signal circuit. Or you may have lost the 5Volt reference voltage.

A code P0122 may mean that one or more of the following has happened:
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DTC P0171 - System Too Lean (Bank 1)... this indicate that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1. This DTC is very similar to P0174, and in fact your vehicle may show both codes at the same time. You will more than likely not notice any drivability problems, although there may be symptoms such as a lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration.

A code P0171 may mean that one or more of the following has happened:
The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
There could be a vacuum leak downstream of the MAF sensor.


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When the MAF on most vehicles reach a point of preventing the engine from starting, you can usually just unplug it and the engine will start. If that doesn't work-
You may want to try having the O2 sensor, ( Oxygen sensor ), checked. It works with other components of the emission system and can cause similar symptoms as the MAF, including preventing the engine from starting.

Donnie

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