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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

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Old 11-14-2012, 07:08 PM
1986toughf150 1986toughf150 is offline
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1986 ford f150

i have a 1986 ford f 150 with a 302 in it. when i drive it and let off an keep it at a steady throttle it cuts out then comes back to life. any ideas what it would be??? thanks
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Old 11-14-2012, 08:28 PM
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william.a.vose
It could be your TPS (Throttle Position Sensor) on the early EFI systems they are real touchy on adjustment. The only adjustment is the idle stop screw and it has to be set to 1.0 volt measured at the center lead. If you can't get it there, then it will need replacing. Do not use an aftermarket, only a Motorcraft one will work correctly!
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Old 11-14-2012, 08:47 PM
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I would think the first thing to do would be to check the codes, no?

But you (Bill) are an industry expert, so I will defer to your knowledge.
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Old 11-14-2012, 08:51 PM
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william.a.vose
Chris, codes may or may not show anything. What he is describing sounds like the nightmare Matt had with his 86, that was one of the symptoms.
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Old 11-14-2012, 09:11 PM
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thanks guys i will try that
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Old 11-14-2012, 10:01 PM
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This might help:

Fuel Injection Technical Library » Throttle Position Sensor (TPS)

If you're interested in seeing what the computer has to say:

Fuel Injection Technical Library » How To Run a Self-Test
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