Question about 1991 Ford F150

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My 1991 Ford F150 shut down while driving. Already eliminated the fuel pumps. I have been led to believe that it is probably one of these 4 things: crankshaft position censor, idler control valve, intake leak, vacuum leak. To me, the sudden shut down points to the censor or the valve. If so, where on the motor would I find those and are they easy to replace?

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  • kevin_moss2 Aug 31, 2010

    5.0 liter, 2 wheel drive. would the ignition module and the crankshaft position censor give any warning signs? For a while, about once every other day, while breaking the engine lunge a couple of times before stalling. If I caught it and put it in neutral and feathered the gas, it would smooth out and not give me any more trouble that day. I was thinking it was just way over due for a tune up.

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  • Ford Master
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If you are certain the fuel pump is running, (you can hear it cut in for a few seconds when you turn the key) and certain the fuel filter isn't clogged, i would suggest, first of all, you get a timing light and see if you have spark on all wires. Then if you do, aim the light at the crank mark and turn the engine over. If the marks jump all over the place, you have a timing chain problem.
If you don't have an engine light on, i wouldn't start changing sensors at random. Check the basics first.

Posted on Aug 31, 2010

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  • Master
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What Engine size do you have? This will be of great help.
For now, with out knowing the engine size, it could be the ignition control module on the dist and looks like this.
Until i know the engine size of course.

My 1991 Ford F150 shut - 35a044d.jpg

Posted on Aug 30, 2010

  • 3 more comments 
  • GetMeOttaHere Aug 31, 2010

    Your vehicle does not have a crankshaft position sensor. There is a hall effect switch inside the distributor that is almost like a crankshaft sensor.

    I suspect an ignition component is causing this problem. Ford used two types of ignition systems, DuraSpark on Carburetor engines and TFi systems on fuel injected systems. You have already ruled out the fuel system, so I would start with spark control.

    I have test procedures that will allow the start of properly diagnosing, before we guess by just replacing parts. How many miles are on this truck and what ignition system do you have?

  • GetMeOttaHere Aug 31, 2010

    Also, if the spark plugs, and wires as well as cap and rotor have not been replaced in a while, it would be a good idea to inspect these areas as well. These components are replaced as normal maintenance.

  • kevin_moss2 Aug 31, 2010

    150k...EFI. I will be leaving for work in a few minutes. you can call or text me at 267-614-8273 or use another email address that goes to my phone...tkminternetsoluitons@gmail.com.

  • kevin_moss2 Aug 31, 2010

    Or I will have to wait until i get home.

  • kevin_moss2 Sep 01, 2010

    I thought I had accepted this solution and was waiting to hear what to do next to help diagnose my problem. Could you please continue?

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