my E 320 have a misfire code p300 and p305 andp306 on 1997 Mercedes-Benz E320

so i unplug the injector # 1 pluge in the noide light and start the engine the light did not come on but when i try # 2 the same way i did # 1 the light flash on then off the shop technician say i could be the cumputer is bad does any no the answer to this it been a pain i also had mercedes scan tool and it do not know what cause misfire 5 and 6 ?

by in Lithonia, GA on March 11, 2013
2 answers 1 comment
ANSWER by on March 11, 2013
if ignition lines are good and the spark plugs are good, check fuse panel. computers don't make mistakes. people do. may need to be reprogrammed if any serious modifications have been made to intake or exhaust.
COMMENT by on March 12, 2013
I have check fuse near computerfive fuse plus a large fuse all good i just want to know mercedes scan tool can or should detect a bad computer because the technician say the computer is good but when i disconnect the fuel injector connector and plug in the noide light in # 1 it did not light up when i start the car is tell you that the computer is bad i do know tell me.? no modifications have made to intake or exhaust.
ANSWER by on June 19, 2014
replace the left (driver) side catalytic converters