2000 lesabre limited no spark on 1 and 4 (fixed)
I have a 2000 buick lesabre limited with the standard 3.8 series II engine.
just the other day it started running very rough at idle loss of power and a constant miss.
i have replaced the air filter the plug wires the spark plugs and 2 of the coils
i still get code p0300. i have steady vacume .fuel pump is only 4 month old
no fuel leaking from regulator my injectors all have the same resistance within a ohm
or 2 .When the car is running i pulled each injector connector off one at a time
cyl 1 and 4 made no change to the engine. so i then checked for spark on all cyl. againe
no spark at 1 and 4 the other four cyl have spark. i then pulled the coil for 1 and 4 off it is a new coil at the icm i get 12 volts at this coils location but no switching signal.So the is running on 4 of 6 cyl .Any body have any ideas could this be the ICM.