| [GMCnet] Re: How to test distributor modules [message #368178 is a reply to message #368177] |
Thu, 23 December 2021 14:52  |
James Hupy
Messages: 6806
Registered: May 2010
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Senior Member |
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I have only one thing to say about caps and rotors. Genuine GM parts are a
cut above the aftermarket stuff. Particularly when it comes to primary
circuit contacts. Frequently the aftermarket stuff will move instead of
interconnect with the plugs. That will fry a module quickly.
Goes without saying about the secondary circuit. Make all plug wires
connect where they should, and keep the plug gaps no greater than .045".
You know that funny looking plastic ring that you couldn't figure out where
it went? It secures the secondary conductors to the cap. Use it. Good
insurance policy.
Jim Hupy
Salem, Oregon
On Thu, Dec 23, 2021, 12:31 PM John R. Lebetski
wrote:
> More likely it failed because the missing terminal caused the coil voltage
> rise to go to maximum as no reachable path to ground. That spark may jump
> to the next available terminal as it nears. That gives that cylinder a
> grossly advanced spark. This can hammer out ring lands or head gasket. I
> think
> the rotor/button fail is simple wear item. They do that over time or if
> contact is bad. The rotor could have initially whacked the cap if not
> perfectly homed or poorly made. I have seen caps where the terminal(s)
> were not cut and the rotor would collide.
> --
> John Lebetski
> Woodstock, IL
> 77 Eleganza II
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