Re: not necessarily...???please explain - Saab 900 Bulletin Board - Saabnet.com
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Re: not necessarily...???please explain
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Posted by JohnK (more from JohnK) on Tue, 9 Oct 2001 17:01:22 Share Post by Email
In Reply to: not necessarily..., Wes, Tue, 9 Oct 2001 15:23:08
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I question that a corroded hall dist connection could result in a weakened spark that is strong enough to be visible at the coil secondary, but not strong enough to make it through a good rotor and good wires. You might get intermittant spark(at the coil and the plugs) due to the bad connection, but I don't think you get a weak spark.

If the rotor and spark wires are OK, and you see spark at the coil, I think you'll see it at the plugs. Conversely, if you disconnect the hall plug(disrupt the circuit) on the distributor, you will get no spark anywhere.

The coil primary power circuit does not go through the Hall connection itself, because the Hall sensor is really just an on/off switch that activates the control module. The coil primary voltage will in turn be supplied/cut by the battery/contol module circuit. As the primary field collapses, and you get spark at the secondary, it's just up to the spinning rotor to distribute the jolt to the wires/plugs.

Maybe I'm missing something, but I'll lay my money on a bad rotor if you get spark at the coil secondary but none at the plugs. Cap and wires are the next suspects but aren't as black and white as the rotor.



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