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Chris T

Sharp voltage spikes, what cause?

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Morning all. After many many hours of investigation work and testing, David at Canems ECU's suggested it may be the unusual sharp voltage spikes above and below a baseline of about 14.4v (up to 16.5v low as 12.5v) that could be upsetting the ECU and causing the un-tracable rich running and misfire. So, I disconnected the fan belt and ran the engine and now I still see voltage spikes but now only above a baseline of 12.5v obviously with the alternator not turning. 

Is the voltage reg still in circuit with alternator not turning? What else could cause such spikes? I expected to see a nice smooth voltage trace with the car running solely on a battery....

Chris.

 

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If you have just taken the belt off the wiring will be in the same state and still in circuit.

 

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High voltage cables ‘leaking’ to low voltage lines ??

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Hi Peter, perhaps..... I have tried to separate HT from LT but not much difference. Next up is to remove alternator and therefore the voltage reg from the equation entirely, then see what happens.

 

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