Question about 1992 Ford F150 SuperCab

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I have a 1992 F150 4.9L. couple weeks ago it stalled out and wouldnt start, changed the coil it started right up and abot four more times that day then nothin. I have a new coil, new ecc, new cap,rotor, and yesterday pulled the distributor and changed the pick up coil, then it started right up had to adjust the timing a litte but it ran fine for about twenty minutes than it just shut off again! like some turned it off. It is getting fuel at the rail and I can hear the fuel pumps working. Please if anyone has any ideas at all on what could be wrong Please help! It is driving me crazy

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  • jbrigadier Oct 13, 2010

    Sorry I forgot to mention that it will crank all day but won,t start?

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1) Have a look at the starter relay. Pull it out and ease the cover off and then check out the state of the solder joints. If any are dry and or there are signs of annular cracking around any of the power pins simply reheat with soldering iron to make good. 2) Check out your idle air control valve. Clean the throttle body interior and passageways to and from the IAC. Check that the valve is free to open and that it opens when at idle. 3) Check out your fuel pressure regulator (FPR). It sits on the end of your fuel rail. When the car is idling pull the vacuum line from it. The engine revs should pick up for a few seconds before running roughly. If you do not get this response apply vacuum to the FPR and this should cause the engine revs to drop. If by applying suction you pull fuel throught he vacuum port then the FPR needs changing 4) Lastly check all vacuum lines. Spray suspect areas with WD40 and if there is a leak there the engine will jump slightly in revs.

Posted on Oct 13, 2010

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  • Joseph Prosser Oct 13, 2010

    OK don't over-crank it otherwise you'll fry your starter motor stator coil windings.
    Do you have fuel pressure, I know that you can hear the pumps but is there fuel delivery? Sometimes a clogged pick-up filter/strainer in the tank or in-line filter can negate good pumps. If you squirt plenty of fuel in the intake does the engine fire up at all?
    Check out the FPR (3) take the vacuum line off and if fuel dribbles out or it smells strongly of fuel the diaphragm could be broken.
    Last, but not least, change your crank sensor. The ECU takes its timings from here and if is faulty it will prevent the delivery of fuel at the right time.

  • jbrigadier Oct 14, 2010

    ok thanks i will give this stuff a try tomorrow I let you know what i find. oh? where is the crank sensor located?

  • Joseph Prosser Oct 14, 2010

    OK apologies my mistake the 92 4.9 does not have a crank sensor...but what it does have is a Thick Film Ignition TFI module which just like the later cam sensor is prone to age and heat. It is located on the fender and is looks like a small black plastic cigarette packet with wires to it. To find your way around: start with the multi connector towards the bottom side of your distributor. One wire goes to the ignition switch, two go to the coil (low voltage supply) and three wires lead to the TFI box. In the mid 80s TFI modules were mounted directly to the outside of the distributor body but after bad reliability they were re located by Ford to the fender. There is a junction in the wiring harness between the distributor and the TFI. Disconnect this junction and ensure that the pins and sockets are free of corrosion and dirt. Connect and disconnect this junction a few time to freshen the contacts. Try to start it. If no joy........change your TFI module. Inspect your plugs to ensure that they are dry before trying to start.
    If the engine still has no life check the fuel pressure on the fuel rail. When you put ignition to position 2 (key on, engine off) the pumps run up to build pressure. However when you put the key to 'ignition' the power is taken from the pumps and the fuel pressure in the line and rail is kept high by a non return valve in the pump. If this valve is leaky then the pressure drop will ensure that there is never enough fuel to start. A quick check is to see if by spraying fuel in the throttle intake that the engine will fire. Once running (key now again at position 2) the now running pump will maintain pressure and the engine will be fine until restart is required.

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