Hi, Im Jose and I have this code, P0305.

Question

I changed the spark plug, i had the fuel line flushed. I changed the spark plug wires. Can you guide in the right direction, like towards the fuel injector or what else could be the problem? Thank you!

Answer 1

have the also replaced the spark cap and rotor?

 

if so you can check for intake air leaks, you can try to disconnect injector 5 and couple other ones and see if the RPM's drop as much as the other injectors.  You can also check fuel pressure (34 psi at idle)

 

if still no luck check compression 

 

Standard:

1,196 kPa (12.2 kg/cm2, 173 psi)/300 rpm

Minimum:

883 kPa (9.0 kg/cm2, 128 psi)/300 rpm

Difference between each cylinder:

98 kPa (1.0 kg/cm2, 14 psi)/300 rpm

 

POSSIBLE CAUSE

Improper spark plug

Insufficient compression

Incorrect fuel pressure

The injector circuit is open or shorted

Injectors

Intake air leak

The ignition secondary circuit is open or shorted

Lack of fuel

Drive plate or flywheel

Heated oxygen sensor 1 (front)

Incorrect distributor rotor