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Alternator Noise with MS2

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Engine block ground is OK. Just as long as it is a reasonable  distance ( 12 inches??? )  away from Starter motor. Starter motor produces a huge amount of EMI when cranking. You don't want a sensitive ECU ground close by. Starter will also induce electrical Eddy currents in the engine block close to the starter. These dissipate with distance. 


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All of this talk about single ground points - engine block, intake manifold, battery negative, etc., whatever - as single points, is pointless.  It's the complete circuit that matters. Just be sure that whatever it is that you're powering (and by powering I mean current flow), has a good clean low resistance circuit.  It's a circle. 


If you think in terms of a circuit, then things like your injectors, and the ECU, and your AFR gauge, and your O2 sensors, and your alternator power circuit, and your battery charging circuit (which should be thought of independently of the starter power circuit although the wires might be in the same places), etc., will all make more sense.


You can have a fantastic, clean, large gauge wire ground to the intake manifold but if the manifold is not tied well to the block or the alternator of the battery or wherever you decide the current needs to start from and end at, then the perfect excellent contact with the intake manifold won't matter. 


You have to work out the complete circuit.  I think that much confusion is caused by the age-old practice of attaching the alternator power lead to the starter power lug, and the negative cable to the starter close to it.  The starter cables are so big that they draw all of the attention. 

Edited by NewZed

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