90 S-4

re: (1990 S4 Mtr)
#1.
I goofed, In the process of changing the rotors, caps, wires, coils & plugs, I
forgot to mark/index the position of the old rotors before I took them off. The rotors aren't indexed with a cut out or notch or tab,
they will attach at any one of three positions 360° How can I verify
I have them positioned properly without getting to involved, is there a quick way out ?

&

#2.
I'm not clear on determining if a plug wire resister needs changing.
The book says you should get a 3K ohm reading on the resister + - 10%
John Pirtle' says if it tests with a higher Resistance it should definately
be replaced. I measured my old resisters and got the following >

#5 = 2.61 ^ #1 = 2.66

#6 = 2.74 ^ #2 = 2.78

#7 = 2.79 ^ #3 = 3.13

#8 = 3.13 ^ #4 = 2.70


So which ones are bad, Do I have 6 good ones and two bad or
do I have 2 good ones and 6 bad ?

Thanks..

Rob Edwards

Joe-
RE: Question #1, there are 2 ribs spaced about 1" apart on the front face of the cam gear- the rotor points at that. Not sure if you can still see them with the TB covers on. If not, IIRC there's an arrow on the front of the TB cover that the rotor points to when the engine is at #1 TDC.



Arrows on cover:

Tails

#1 IIRC the rotors will only assembly in the correct position as the 3 set screws are pitched that they will only line up in one position.

#2 +/- 10% gives a range of 2.7 to 3.3 ohms. So 6 of your reading are within tolerances. For the 2 units I would check again, ensuring that you have a very clean surface areas where you press the DVM probes against, as you are working with such small resistance values any dirty surface could make the difference.

If there is any corrosion withing the plug ends the resistance would be a much higher value.

Tails 1990 928 S4 Auto

90 S-4

Thank you Rob & Tails, it looks like it's time for me to go to Lense Crafters