No start. No ignition
#1
No start. No ignition
I have a 1991 F150 with the 4.9 straight six engine. Manual transmission. After the engine runs for a while, it will just shut off as if you had turned the key off. Then it will not restart. I check for ignition at this point and have none. I am using the spark tester that you put a spark plug wire to and clamp it to ground.
So far I have replaced the pickup coil inside the distributor, the module on the distributor, the coil, plugs, wires. None of this fixed it. If the truck sits long enough it will fire right up and the process repeats. Any ideas on a way to test this system? Thanks
So far I have replaced the pickup coil inside the distributor, the module on the distributor, the coil, plugs, wires. None of this fixed it. If the truck sits long enough it will fire right up and the process repeats. Any ideas on a way to test this system? Thanks
#7
Hi,
I'm the first to want to test parts before replacing but....
On a 25 year old truck and showing certain signs.
If the part is not expensive I will replace with OEM/Motorcraft if available?
Saw this!
help with ignition switch - Ford Bronco Forum
I'm the first to want to test parts before replacing but....
On a 25 year old truck and showing certain signs.
If the part is not expensive I will replace with OEM/Motorcraft if available?
Saw this!
help with ignition switch - Ford Bronco Forum
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#8
#10
Correction: An ignition switch did not totally resolve the issue. I replaced it with a new motorcraft switch but this morning the same problem showed up again. Still no spark. So I did more testing of the ICM, PIP, Coil, wiring, ground connections..... and eventually that led me to pulling down the engine computer behind the drivers kick panel. I removed the cover to look at the circuit board and found the problem. The capacitors had leaked out onto the circuit board and damaged it pretty badly in three places. I ordered one and I'm pretty confident this will fix it.
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