Quote:
|
Originally Posted by CJ_Boxster
...I think the engine temp drop is cause the faulty MAS was sending an air temp reading of -40 degrees while it was malfuntioning so the engine would run hotter cause its thinking its freezing outside. If not, oh well the cars great now...
|
Hi,
Uh... Nope. Engines don't work that way. The MAF does not signal ambient Air Temp to the ECU (DME in Porsche Parlance), it signals the Mass of Air flowing past it. Nor does the ECU regulate Engine temp in any way although it does marginally respond to it by altering Spark and Fuel to maintain a stoichiometric mixture.
The only engine temp regulating devices on the car are the Radiatyor Fan temp sensor (which switches the fans on once the coolant temp reaches 185°-190°F ) and the coolant thermostat which remains closed, closing the loop to the radiators, until the engine coolant reaches 100°F to reduce the engine warm-up time to keep the period of high emissions as short as possible and allow the car to idle well when cold.
Glad you got your issues resolved, but any reduction in temps is either a placebo effect, lower ambient air temps, tightening of the serpentine belt, bleeding or topping off the coolant, or cleaning of the radiators. Hope this helps...
Happy Motoring!... Jim'99