http://www.zyra.me.uk/firingo.htm
> lark 2.5 liter eng
> lark 2.5 liter eng
GMs are typically 1-3-4-2
Carmen,
Firing Order is 1 - 3 - 4 - 2
#1 Cylinder is on the drive belt (passenger side) of the engine.
The dual coil units on top of the ignition module are 1 & 4 on the
firewall side coil unit and 2 & 3 on the radiator side (those actually
should be marked with the appropriate cylinder number).
Regards,
Bill Bowen
Sacramento, CA
>lark 2.5 liter eng