Originally Posted by m1bjr
You have explored logging the HP fuel line pressures and LP lift pump feed pressure etc?
You'll lose boost as it will 'manage' it all over the place with erratic fuel pressure....
And the HPFP is such a common issue.
Hi Steve sorry for the late reply.
I have just changed the JB4 module [ given to me by idnan ] and it still doesnt seem right, although it does feel a bit better. Im still thinking its the diverter valves or chargepipe!
Not sure i know how to do what you are suggesting, any guides anywhere or is it a garage job?