P0304 Ideas?

[AJR182]

Just after some advise on this as I've changed the coil pack, leads, plugs and the No 4 injector along with the pre cat Lambda sensor.
The EML came on tonight after a few weeks of good running (P0304).
Any advise on what to change/check next would be greatly appreciated as I'm stumped.
Many thanks.

 

[bashracing]

no4 is at timing belt end incase you didn't know
compression test

 

[AJR182]

Yea, that's the one I changed bud. This might be a stupid question but can most garages to a compression test?

 

[bashracing]

Back street garage possibly won't be interested, but any proper mechanic will, there seems to be more shite mechanics (they're fitters really not mechanics) about than ever before, only one I would put my name to in sheffield is Paul Roddison

 

[AJR182]

Thanks for your reply matey, I'm in Sheffield too. Will have a google search for the location.
Much appreciated bud, nice to have a next step in place to check.

 

[jamesycc]

Have you checked the wiring to the injector itself. Never done it myself but if you've done all the other stuff it might be worth checking the injector is getting the right power. Just a thought.

 

[jamesycc]

Po304 is a random misfire fault code. I used this website when I had my misfire issue
http://www.obd-codes.com/trouble_codes/
Really useful guide.

 

[bloke]

0304 is cylinder 4

 

[Jonz]

If you changed the plugs I assume you're fine with whipping the manifold off, a compression tester only costs about £15-25, just a guage that screws in to the spark plug hole, cheaper than a garage would charge to do it I think.

 

[AJR182]

Thanks for you info lads, I've just bought a tester for £15 like you said Jonz. Arrives Friday so I will have a crack Saturday morning and let you know how I get on. I will test the voltage to the injector too for peace of mind James.

 

[bloke]

voltage is permanent, you need to check for a pulse when it's cranking/running.