I've been going through possible solutions and have come down to fuel pump, map sensor, injectors or chip..first two to try and get off the list...

1) FUEL PUMP - Bosch044 - have checked the flow at engine and its as should be at 4.4L / min, also checked voltage. Can I cross this off my list?

2) MAP sensor - correct 3bar sensor fitted, but checked and whilst input is correct at 5V, earth is fine, however signal voltage is less than it should be...should be 2.2V with ignition on...I've only got 1.52V...Replace?

thanks in advance,

Mike