No spark
Thread Starter
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Mountain Pass
Joined: Feb 2000
Posts: 120
Likes: 2
From: PA
No spark
I have a 1985 F-150 with a 300ci engine. I do not have spark. I have changed the TFI module and the Hall Effect Pickup plus the igniton switch. On the trouble-shooting routine I have from an Alldata CD, it calls for at least 90 percent battery voltage at terminal #4 of the TFI plug when the ignition switch is at START. I have less than a volt. I have the proper voltage at #2 and #3 with the ignition switch in the RUN position. I have voltage at the + terminal of the coil. The coil has 7.38k ohms resistance between the high voltage terminal and the negative terminal. Resistance between + and - terminal of the coil is .9 ohms. I have run out of ideas. Also, where can I get a good wiring diagram of the igniton system. All I have is the vacuum and electrical trouble-shooting manual that comes with the set of shop manuals. Any and all help is wanted and welcome.
Junior User
Joined: Jan 2003
Posts: 75
Likes: 0
From: valencia pa.
No spark
Even though you have changed the module I would check to make sure you didnt get a bad one. Also, you may want to check your solinoid switch for a broken or corroded wire and do the same on the coil and the module connections.Last but not least,check the coil tower to make sure it isnt cracked or corroded since these are notorious for this. Good Luck
Thread Starter
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Mountain Pass
Joined: Feb 2000
Posts: 120
Likes: 2
From: PA
No spark
Problem turned out to be a defective coil. When I connected a jumper to the + terminal of the coil from the battery and a jumper to the - terminal and intermittently grounded it I had no spark. The coil checked out OK when checking resistance in the primary and secondary circuits.
