[logician]

Hi,

I have an '86 930 with a PermaTune CDI unit. I recently did a static test on the distributor signal resistance, i.e. between pins 3 and 6 of the CDI connector. I initially measured 680 ohms with the engine cold. I then measured the resistance with the engine hot, and got a reading of 730 ohms. The Porsche spec for this resistance is between 580 and 700 ohms. The Permatune web site says that the resistance should be 600 ohms +/- 25 ohms. Permatune recommends that the distributor be replaced if this resistance is out of specification.

Question: has anyone else observed this resistance changing with temperature? Has anyone found that they had ignition problems resulting from out-of-spec distributor signal resistance?

While I have a 930, I think that SC's have essentially the same ignition system, so my question could be answered by SC owners also.

Thanks,
-Juan