04-03-2005, 11:59 AM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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The action of an electric tachometer can help trobleshoot your ignition system quite often.
If you can remember the way the tachometer acted at the time you had you problem it will give you a clue as to where to look. For instance:
1 Did the engine just die flat (as if you turned the key off) while running down the road?
2. Did the tachometer drop to "0" or was it bouncing around OR did it continue to register as the RPM's continued to fall?
If the Tach fell to "0" it would indicate a failure in the primary side of the ignition. look at the trigger wire connections to the distributor and the small red wire that goes to the switched 12 volt source of the ignition. Assuming you are using a MSD distributor, or Ford OEM magnetic trigger type; disconnect the distributor and measure the resistance of the module within the distributor module should be between 400-1300 ohms. If it is within this specs it is ok. Next consider the coil. MSD's step up the voltage to the coil an this can be hard on a coil. Be sure the coil you are using is designed for and compatible with the MSD box.
Rick
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
Last edited by Rick Parker; 04-03-2005 at 12:10 PM..
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