electrical problem, pickup coil?
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Elder User
Joined: Jan 2004
Posts: 668
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From: NW Kans
electrical problem, pickup coil?
is there something that will make the pickup coil in the distributor go bad? i just put one in last week, and it went bad today. i replaced it with an old one and it ran for a while, then just died again. Wont try to fire. i didnt test it but im sure thats it again. any ideas?
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
Sure. It's a Hall Effect sensor. You mentioned "theoretically" so carrier mobility and magnetic permeability can deterioriate. I've seen the wires break off as well (much simpler to diagnose 
) For a quick check of its condition, measure the resistance between the purple and orange wires on the distributor side of the harness; report back. I will try to find what the lower and upper limits are.
) For a quick check of its condition, measure the resistance between the purple and orange wires on the distributor side of the harness; report back. I will try to find what the lower and upper limits are.
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Elder User
Joined: Jan 2004
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From: NW Kans
measured resistance. 568 ohms. also measured 4 others. all between roughly 450 & 650 ohms. i believe it would be within specs. what did you come up with?
also, while i was out there (in the pasture), i did a TEST. power to coil, good (with test light). Power pulsing out of coil while cranking, good. so i tried starting it; and it ran; for maybe close to 30 seconds. maybe. Repeat test: no pulsing. although the fact that it started again leads me to believe it may not be pickup coil, but possibly ignition module.
also, while i was out there (in the pasture), i did a TEST. power to coil, good (with test light). Power pulsing out of coil while cranking, good. so i tried starting it; and it ran; for maybe close to 30 seconds. maybe. Repeat test: no pulsing. although the fact that it started again leads me to believe it may not be pickup coil, but possibly ignition module.
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Thread Starter
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Elder User
Joined: Jan 2004
Posts: 668
Likes: 3
From: NW Kans
would that be correct? if a pickup coil dies, its dead right? no coming back to life? i can see the ignition module doing it. might try changing that tomorrow and see what happens. thanks for your help.
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
That's correct. The pickup module is what signals the ignition module to break the coil ground and fire the plugs. If the pickup module fails, the ignition module will never receive the signal, and it won't fire the plugs. The purpose of the blinking light test you did is to see if the ignition module is trying to strobe the coil. If the light doesn't blink, the ignition module is not firing the coil. This could be because the ignition module itself is bad, or it's never receiving the signal from the pickup module in the first place.
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