89magic98

My primary ignition coil resistance is 2.5 ohms, well above the 0.4 - 0.6 ohms.

I know that I should probably replace the coil.

However, I'm trying to understand what effect this has as the car starts and/or runs. How is this high resistance effecting the circuit in the DME that is supposed to be supplying the switched ground?

Any thoughts here?

Thanks!

Tom Carson

can't see it doing any damage to the DME (if that what you are asking) btw...is it the OEM coil?

higher resistance = less current in the ignition output stage of the DME, which means less EMF to the secondary windings = less spark to the plugs

89magic98

</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by Tom Carson:
<strong>can't see it doing any damage to the DME (if that what you are asking) btw...is it the OEM coil?

higher resistance = less current in the ignition output stage of the DME, which means less EMF to the secondary windings = less spark to the plugs</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">It is a BOSCH replacement (same #'s as OEM), I think I changed it 6/96, when the other one read .7ohms resistance.

89magic98

bump.