Clicking Noise From Distributer?
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Senior User
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From: Up North
Clicking Noise From Distributer?
I was just wondering if anyone knows if this is normal? My 1979 F250 with a 400 engine - there is a continuous clicking noise at the distributor with the ignition key on, without the engine running. It sounds like it is coming from under the distributor cap.
Sorry if this is a stupid question, I haven't worked on anything this old for quite a number of years. I can't remember all the nuances of these old vehicles.
Sorry if this is a stupid question, I haven't worked on anything this old for quite a number of years. I can't remember all the nuances of these old vehicles.
Postmaster
Joined: Dec 2008
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From: Southern Oregon Coast
Just a thought but have you pulled the distributor cap and looked at everything inside while the key is on to see if anything is sparking? A spark discharge can make a clicking noise...
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Senior User
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From: Up North
Sorry mispoken- key was on!
I recently replaced the cap and rotor (Accel), new coil (MSD), new plug wires (MSD), and new spark plugs.
Maybe about 800 miles on them.
Sorry for the confusion.
I recently replaced the cap and rotor (Accel), new coil (MSD), new plug wires (MSD), and new spark plugs.
Maybe about 800 miles on them.
Sorry for the confusion.
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I believe that the OP said that the noise occurs when the engineis off and the key is on.
Something is allowing the coil to trigger and discharge. Only replied to subscribe. This is interesting. Just happen to have a DII on the bench. Im gonna go wire it up to see if I can duplicate. I am supposed to be working an a bad COP for a Super Duty right now, but I have to wait for parts to be delivered anyway.
Post Fiend
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Ok, I managed to shock the heak out of myself by trying to duplicate this problem. All wired up and functional, I cant duplicate the noise, though I do get a humm just before the snap when the coil discharges, and I am wondering if the OP has changed anything other than the cap and rotor. Is there any possibility that there is a short? in the dizzy or anything loose inside? Perhaps a crack in the rotor itself? This does not explain the trigger situation, but something is making this dizzy trigger. The spark has found a ground creating the false trigger. Seems like when the engine is running the resistance through the plug is less than the actual short, and it fires the plugs, so there is some resistance involved with this short.
Any debris, or metal shavings inside of the dizzy itself?
Any debris, or metal shavings inside of the dizzy itself?
MSEE
Joined: Apr 2004
Posts: 10,386
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From: Austin, TX
In that case, with the key ON, it's likely the module is firing the coil inadvertently. It's either doing this because the Hall Effect sensor in the distributor is erroneously triggering the module, or the module has a short and is firing the coil regardless of the distributor signal.
The challenge here is to find which of the two scenarios is the case without trial-and-error. Does the engine run fine otherwise? Is the clicking sound periodic and steady, or random?
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From: Up North
The clicking sound is steady with the engine off and key on. The engine runs good when running.
I wouldn't think the cap is bad as it is brand new. youv'e kind of lost me on the dizzy trigger-not sure what that is
I wouldn't think the cap is bad as it is brand new. youv'e kind of lost me on the dizzy trigger-not sure what that is
