[T3] How's the trip going?

Jim Adney jadney at vwtype3.org
Tue Jun 21 06:39:28 PDT 2022

On 21 Jun 2022 at 3:36, john carartbyjohn.com wrote:

> I pulled the old rotor.  Shouldn't there be continuity between the center
> and the tab that swipes by the 4 plug wire locations in the cap?  I don't
> get and reading there at all.

Good rotors will have ~5000 Ohms from center to tip due to a built in 
resistor. Many aftermarket rotors will be zero Ohms. If that resistor goes 
open, the HV spark will jump the break and still run the engine, but that 
internal spark slowly eats away the ends of the break, making the gap wider 
and wider, eventually leading to poor running.

As this is happening, the voltage at the center contact has to go higher and 
higher, making punch-thru more and more likely.

I think you've found your smoking gun.  ;-)

I make a point of checking the rotor and SP connector resistances at each 
tuneup. Any that have gone to infinity get replaced before they start to cause 
poor running.

Hope you can find a replacement rotor quickly. If the local FLAPS can't get 
one, look for an independent VW or foreign car repair shop.

Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA

More information about the type3-vwtype3.org mailing list