have a VAG workshop bulletin for the DF, DG and SP engines which says that 
from Aug. 87 spark plugs with a single earth electrode are being installed in 

place of the three electrode� plugs, this is in conjunction with a modified 
ignition coil which has a grey sticker.

The recommended plugs for the green coil:� � W7 DTC 14-7 DTU� N7 BYC 

� � � � � � � � � � � � � � � � � � � � � � � grey coil:� � �� W7 DCO 14-7 DU 

� N7 YCX

�� The Primary Resistance for the green coil is 0.8 Ohm and the Secondary 8.5 

K-Ohm

and� the Primary Resistane for the grey coil is 0.6 Ohm and the Secondary 6.9 

K-Ohm 

This may apply to other engines but the bulletin was in the manual for the DG 

engine, a carburetted 1.9.

Jerome Perkins