1991 Ford F150 Logo
Anonymous Posted on Dec 04, 2011

Dies when gas pedal is pressed

The truck will start after about 5 seconds of cranking and will idle slowly, but dies the moment you hit the accelerator. Throttle position sensor has a smooth ohms test.

1 Answer

Marvin

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  • Ford Master 85,242 Answers
  • Posted on Dec 04, 2011
Marvin
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This engine has automatic idle speed control, the computer controls a "air bypass" valve on the side of the throttle body where the air intake hose from the air cleaner is connected, the valve and the throttle butterfly get "sludged" up and this causes all kinds of idle problems and off idle stall, see full list below and fix for the problems

Here is the common cause of surges, cold stalls, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours.

To correct this problem Buy a can of throttle valve cleaner (it is made by CRC) from the local auto parts store, NEVER USE CARB CLEANING SPRAY, IT DESTROYS THE ANTI-STICK TEFLON COATING, spray it into the air intake through the throttle body of the engine until you have used about half the can, you will need to hold the idle up while you do this, it will try to stall, after this shut the engine down and disconnect the Negative (-) battery cable for 5 minutes. The intake is now clean, if you continue to have the idle speed control problems you may need to seek the help of a professional.

  • Marvin
    Marvin Dec 04, 2011

    The throttle position sensor will not generally cause the symptom you have. My experience is 25 years as Ford factory trained service technicain.

  • Marvin
    Marvin Dec 04, 2011

    You also should have the fuel pressure tested, very low fuel pressure can cause this as well, the pressure should be 42-46 PSI, about 50 PSI when you gun the engine quickly, it should NEVER GO DOWN, if it does you have a clogged fuel filter or a defective fuel pump in the fuel tank.

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