Ignition trouble
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Joined: Aug 2012
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Ignition trouble
I have a 1992 F150 5.0L automatic transmission pickup.* I have been having trouble getting it to start.* It began with it taking a longer and longer time to crank before it would start up.* Now, it won’t start up at all.* It cranks and cranks and cranks but won’t ignite.* There are 200,000 miles on the engine.* I replaced the fuel filter roughly 3,000 miles ago.* The fuel pump relay switch was replaced roughly 200 miles ago.* The spark plugs were changed out roughly 1,000 miles ago.* This morning, I replaced the distributor cap, rotor, and put a new ignition coil in it.* Still just cranks and cranks and cranks, no ignition.* It is a dual tank for the gas, and I have tried both tanks, so unless both pumps went out simultaneously, I don’t think that is the problem.
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Joined: Oct 2011
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From: Pueblo, CO
Did you pull the codes? Did you pull a spark plug and ground it to see if you had spark? did you check fuel pressure? Are the plug wires new too? There's also an ignition control modal. Mine is inside the DS fender near the firewall.
Fleet Owner
Joined: Aug 2005
Posts: 23,667
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From: Easton,Ks
Does the selected fuel pump run for one second and quite each time the key is turned on?
If no then ground pin #6 of the self-test plug and turn on the key. Does the selected fuel pump run for one second and quite each time the key is turned on now?
If the fuel pumps run OK with just the key then check for spark, if you do not get any spark unplug the computer and see if spark returns.
If it does you either have bad grounds (40 & 60) and lack of power (1, 37 & 57) to the computer or you have a bad computer.
If you still do not have spark with the computer unplugged then you have either no power to the coil/ICM, bad ICM or a bad PIP sensor.
If no then ground pin #6 of the self-test plug and turn on the key. Does the selected fuel pump run for one second and quite each time the key is turned on now?
If the fuel pumps run OK with just the key then check for spark, if you do not get any spark unplug the computer and see if spark returns.
If it does you either have bad grounds (40 & 60) and lack of power (1, 37 & 57) to the computer or you have a bad computer.
If you still do not have spark with the computer unplugged then you have either no power to the coil/ICM, bad ICM or a bad PIP sensor.
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