#1 and #3 injectors dont work

[mjbll]

I have an 01 Sentra with 1.8 motor.I have the following codes: p0300,p0134 and p0154.The engine is very hard to start and is basically running on 2 cylinders.I have replaced all coils and plugs .When the engine is running I can remove injector #1 and #3 and it made no difference.I replaced the two injectors and it made no difference.I used a 12v test light and it lit up on #1 and #3 harnesses while engine was running.My question is can this be a bad ECU of possibly the MAF?

[boyrs]

the codes as you listed are Multi cyl misfire, o2 sensor one, and o2 sensor two.

doubt it's your MAF, it should throw a code for that as well. if the ECU is dead, you shouldn't be able to start car or pull codes, if it's faulty, the only way to fully know is to test everything else. to read up on a bad ECM (ECU) check here
http://www.nissanclub.com/forums/b15...-flooding.html

could be a couple other things:
- Insufficient compression
- Incorrect fuel pressure
- EGR volume control valve
- The injector circuit is open or shorted
- Injectors
- Intake air leak
- The ignition secondary circuit is open or shorted
- Lack of fuel
- Drive plate/Flywheel
- Heated oxygen sensor 1 (not likely if both sensors are throwing codes)
- Incorrect PCV hose connection

[mjbll]

Please explain about the flywheel.I did a compression test and cylinders 1-4 read 165,160,160,175.I read in the my haynes manual and it says compression for the 1.8 should be 192psi.I guess thats when new.I just bought the car dirt cheap as a fixer upper and the motor has 133k miles with suspect maintenance.Fuel pressure when running is 40 -42 psi.I have replaced fuel pump and regulator,all coils/plugs,injectors 1 and 3.I put 12v test light on injector harness 1 and 3 and it lights up when running.I was told I need a "noid" light to properly test harness though.Im not getting clicking on injectors 1 and 3.The recall was done a 113k on the crankshaft/camshaft sensors.HELP!!