Mine has been there for about 4 months now through the brittish weather and its still working fine. Maybe people have wired it in the wrong way. Or they have opened theirs up and messed with the POT as it was set out the factory. If it don't work just solder the MAP Sensor wires back together and heat shrink it so its as good as new. An try wiring it into the ECU which i haven't seen done before with the JAM FCD, but have got a wiring diagram for the HKS FCD. Edit: When fitted your car will run lean so you will need a Rising Rate Fuel Pressure Regulator, which will need to be setup at a Rolling Road.