Not getting any spark
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Not getting any spark
I have a 79 F150 with the 351m it ran fine then all of the sudden I stopped getting spark. I replaced the ignition coil and ignition module also plugs and wires and still have no spark. I checked for power at the coil and I have it but for some reason its not sending it out. any ideas thanks
New User
Joined: Dec 2012
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no. If you can pull that 8 point gear off the shaft but don't lose that key that holds it in place. Its much easier to remove distributor and for it all. Or check to make sure you have power to your brain box on fender well.
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
Can you please explain what you mean by not getting any power out of the ignition module? What are you expecting to see, and what are you actually seeing? The ignition module is not supposed to "put out power." Its only job is to provide a path to ground for the ignition coil, and then break the path to fire the plugs, over and over. Power goes applied to the module as 351M78 explained, but it does not come out.
You are not using an effective means of troubleshooting. You will not be any closer to having your truck fixed until you check what Mike described above.
You are not using an effective means of troubleshooting. You will not be any closer to having your truck fixed until you check what Mike described above.
Freshman User
Joined: May 2012
Posts: 39
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From: Dorr, mi
my '77 lost spark and it turns out the clip that plugs into the side of the coil wasnt making contact if that helps
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Laughing Gas
Joined: Dec 2003
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In addition to what mikeoOoOoO said about checking the pickup coil in the distributor. I've had 2 fail on me in that the wire broke off where it enters the magnet, so visually check for that too. The aftermarket ones are cheap and use smaller wires that break off since it's bolted to the vacuum advance plate and is always working back and forth. I got a brand new one from NAPA that didn't show any resistance between the orange and purple wires, it was on open circuit (junk) right out of the box. I put the 30 year old original one back in that I had in the shed (replaced it when I rebuilt the motor several years ago thinking it was a good idea) and it's been running fine ever since.
Also check for a loose connection on the two small wires on the starter relay beside the battery. One is from the ignition switch that operates the relay and one feeds the ignition when starting. If a connection is loose/corroded/dirty, it can show voltage at the batt side of the coil but may fail when a load is placed on it.
Also check for a loose connection on the two small wires on the starter relay beside the battery. One is from the ignition switch that operates the relay and one feeds the ignition when starting. If a connection is loose/corroded/dirty, it can show voltage at the batt side of the coil but may fail when a load is placed on it.
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