Originally Posted by
sillymofo
if your car is chipped its not uncommon to have a pipe disconnected it is to cheat the ecu's map sensor so you can run more than ten psi of boost as for the spluttering under load i would check the voltage going to the fuel pump as it sounds like fuel starvation it should be a minimum of 8 volts at tickover
Your info is a little bit off there fella.....
!! Do not ever disconnect the pipe to the ECU or you will have nothing but a dead engine, the ECU retards the timing based on the MAP sensor's input and if it doesnt then you will Detonate at the very least blowing your HG and at the worst putting a hole in your pistons and or cracking your head!!!!
Fuel pump voltage is not variable and should be around 12v at idle not 8v!!
To answer
Dave100e's question the 3rd pipe goes to the metering unit, if it's not connected and your car runs then my guess would be that the return has been blocked off on the metering unit, which is fine
