1992 Ford F250 5.0, crank but no start
01-25-2017, 03:07 PM
#1
1992 Ford F250 5.0, crank but no start
First time posting on this forum. I have a problem with a 1992 Ford F250 5 litre, that will crank but won't start.
Checked for fuel....it sprayed from the Schraeder valve.
Got strong spark from the ignition coil.
Got very weak spark on my spark tester from any spark plug wires running off the distributor cap. Set the gap very small on my tester, to get any kind of spark, and was still sporadic, even then.
Does this eliminate the ignition module and ignition coil, at this point, and isolate the problem to the distributor? I've ordered a new distributor, at this point, and will also be doing the wires and plugs in the next week.....but just want to get this thing running again.
It's been temperamental in damp weather for the past few years, but never as bad as this time. I hadn't run the truck for about a week, as I just replaced the two front fenders and the rad support, to deal with rust. First time doing this stuff, so took a while to get it all done.
If the problem is now isolated to the distributor, can I narrow it down to either the rotor, cap or pickup coil, at this point, through testing, or should I just replace the whole distributor, and go with that? If every wire gives weak spark, then I know it's not the plugs, and not likely the wires either.
Checked for fuel....it sprayed from the Schraeder valve.
Got strong spark from the ignition coil.
Got very weak spark on my spark tester from any spark plug wires running off the distributor cap. Set the gap very small on my tester, to get any kind of spark, and was still sporadic, even then.
Does this eliminate the ignition module and ignition coil, at this point, and isolate the problem to the distributor? I've ordered a new distributor, at this point, and will also be doing the wires and plugs in the next week.....but just want to get this thing running again.
It's been temperamental in damp weather for the past few years, but never as bad as this time. I hadn't run the truck for about a week, as I just replaced the two front fenders and the rad support, to deal with rust. First time doing this stuff, so took a while to get it all done.
If the problem is now isolated to the distributor, can I narrow it down to either the rotor, cap or pickup coil, at this point, through testing, or should I just replace the whole distributor, and go with that? If every wire gives weak spark, then I know it's not the plugs, and not likely the wires either.
01-25-2017, 09:41 PM
#2
I replaced the rotor and distributor cap tonight, and that fixed the problem. Went from no sign at all of starting to running pretty smoothly. I'm an amateur on this stuff, but it seemed pretty darn logical that if spark changed from strong to weak as it passed through the distributor.....that it probably was either cap or rotor. The rotor definitely had soot and corrosion on the contact. Glad that it saved me the need to buy a whole distributor.