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Registered
Join Date: Jul 2004
Location: Upstate New York
Posts: 3,278
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This is a known problem, and Porsche put out a tech bulletin on it around 1989 or so.
It seems that the smaller (gear reduction) starter generates a stronger magnetic field when it is cranking, and stray magnetism fools the speed sensor into firing the ignition pulse on the compression stroke. This results in a "thud" and a halt in cranking for a second. The next few times that you attempt to start it, it may be just fine.
The fix is to retrofit the later flywheel sensor bracket and a shield for the speed sensor to stop that.
And, that's the way it is....
gb
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Good luck, George Beuselinck
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