Mk3 golf gti seems faster and more responsive when engine temp is below halfway on the dial why?

Answer 1

Several reasons.....,I also had 1....It could be that you are running too lean when hot or still running too rich I think the rich problem is more commen,The FI system looks at engine temp makes conditions slightly richer when cold to enable smooth acceleration when cold,Hot high revving engines dont like to run rich as it makes the explosion slower therefore the burning process is slower therefore less power.Have your ECU and all sensors checked at a by a knowledgable mech.Could also be fuel pump...when petrol warms up the pump wich could be worn starts "Slipping" therefore not delivering the correct pressure and or flow at the injectors,could be crappy old injectors not spraying the fine mist they supposed to anymore.Check your fuel pressure regulator.Could be a faulty knock sensor....These MP9 sustems also have a kreep home mode,if a sensor or 2 is malfunctioning the ecu puts the car in kreep mode to enable you to kreep to a service centre..