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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Could use some advice about ignition

 
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Old 02-16-2016, 12:43 PM
95_460
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Could use some advice about ignition

Hey guys, I am stumped, I have a 95 F-250 with a 460ci. It works fine most of the time but now and then it will crank and crank without starting. I know I have fuel pressure at the rail so spark has to be the problem. I have replaced the coil and the Ignition module on the drivers fender because I needed the truck. It worked fine for a couple days and then wouldn't start again. Both times I put a spark plug in the coil wire to see if it had spark, it did, so I put a plug in a regular plug wire and both times I did that it started. Any ideas what would cause me to intermittently lose spark? Oh BTW, I have replaced the cap and rotor as well. Any help would be awesome, thanks for reading.
 
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Old 02-16-2016, 12:53 PM
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Fuel at the rail means nothing if the injectors aren't firing. When it just cranks and cranks, does your fuel pump keep running with the key in the on position?
 
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Old 02-16-2016, 12:58 PM
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Nope it comes on for a second and shut off right away, Have tried both tanks when she wont start as well.
 
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Old 02-16-2016, 03:13 PM
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Intermittent spark problem is probably the PIP sensor inside of the distributor. There are ways of testing it but I am not sure how to do it.

Had the same problem with my 302 - would randomly cut off and not restart right away. When it did start it would run great til it would cut out again. I replaced the coil, ICM, cap, rotor, plugs, wires before I figured it out. I just replaced the whole distributor since it is a PITA to replace the PIP and you have to pull the distributor to replace it anyways.
 
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Old 02-16-2016, 05:45 PM
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Cool, I think tomorrow I will throw a set of plug wires at it an hope there is something wrong with the coil wire that I cant see. If that doesn't fix it I guess the distributor will me my next move.
 
 
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