engine missing--weak coil??
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More Turbo
Joined: Jun 2001
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engine missing--weak coil??
I have a 74 360, when I am driving at steady speeds,or slightly accelerating, I encounter an erradic miss. I thought that it was the carb, I have turned every screw on the thing twice with no changes. 
Now I am wondering if it could be a weak ignition system.
at the time I am stuck with a crummy points type dist.
I have a new set of points,condensor,cap,rotor,plugs,wires,ect.. now I am wondering about the coil. is there a way that I can check the coil to see if it is putting out enough juice? if so, how would I do it and what kind of readings should I look for?
Now I am wondering if it could be a weak ignition system.at the time I am stuck with a crummy points type dist.
I have a new set of points,condensor,cap,rotor,plugs,wires,ect.. now I am wondering about the coil. is there a way that I can check the coil to see if it is putting out enough juice? if so, how would I do it and what kind of readings should I look for?
Thread Starter
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More Turbo
Joined: Jun 2001
Posts: 572
Likes: 1
engine missing--weak coil??
the engine has been rebuilt recently. I did a compression check, if I remember right it was 135 straight across the board. as for the coil being reversed, I will have to check that one tommorow. I just hooked it back up the way it was before I rebuilt it.
Posting Guru
Joined: Mar 2002
Posts: 2,070
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From: Boise, Idaho
engine missing--weak coil??
I just re-learned a lesson about spark plugs. I had discovered that certain engines needs certain spark plugs. My recollection is a little fuzzy about the specifics of the vehicles, but I do recall that changing Champion spark plugs for some extended tip Autolites made all the difference in an older vehicle, probably a Dodge.
Yesterday I ran into the same thing with my 54 F100's 223 engine; two plugs were misfiring. There was a new set of Champions in there. I substituted two Autolites in the misfiring holes and, wah-lah!, misfire gone.
Yesterday I ran into the same thing with my 54 F100's 223 engine; two plugs were misfiring. There was a new set of Champions in there. I substituted two Autolites in the misfiring holes and, wah-lah!, misfire gone.
Junior User
Joined: May 2001
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From: Modesto USA!
engine missing--weak coil??
I'll pass on a lesson I just learned. After rebuilding my 390 it ran well for a couple hundred miles then started missing bad. After tweaking it for 2 weeks with no improvement I asked on the '67-72 board and was told to make sure the coil was making good ground. I sanded the new paint off the inside of the coil bracket and also the place where it mounts to the manifold. It runs great.
I'm no electrician, but obviously (now anyway) the coil needs to contact the block to make a circuit.
I think its like this:
The primary circuit: battery - key - coil - points - ground - battery,
Secondary circuit: coil - dist cap - rotor - plugs - ground – COIL
And I think they are electrically separate, the way the secondary gets its power is the primary winding in the coil acts just like a generator to produce a magnetic field that charges the secondary windings.
Yada Yada
Mike
Of course I could be wrong...
I'm no electrician, but obviously (now anyway) the coil needs to contact the block to make a circuit.
I think its like this:
The primary circuit: battery - key - coil - points - ground - battery,
Secondary circuit: coil - dist cap - rotor - plugs - ground – COIL
And I think they are electrically separate, the way the secondary gets its power is the primary winding in the coil acts just like a generator to produce a magnetic field that charges the secondary windings.
Yada Yada
Mike
Of course I could be wrong...
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Ravin
Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
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Nov 20, 2002 08:55 PM
