would a permanently leaking dump valve cause a melted piston??
Unlikely, but not impossible. Depends if the car is MAF or MAP based, and if it is MAP based, where the pickup for the MAP pipe is.would a permanently leaking dump valve cause a melted piston??
Actually its not "Of course" at all. Generally on the dyno with a car that has a hole between the MAF and the inlet manifold side (IE. Dump Valve) most of the air is wasted out of that hole, so the airflow meter is sucking ten tonnes of air it doesnt need for combustion and the mixture goes excessively rich.Of course it would, you have a hole between the maf and the piston so it runs very lean, the result is melted pistons and another blown CA18DET
I disagree. Sorry and all. Cruise on a standard car is about 15/15.5 AFR, much leaner and it wont even pull along, say the 16/17 mark, so I find it highly unlikely that its run lean enough, for long enough at cruise to do any damage - lest we forget how little load there is at cruise. Far more likely to have the wrong plugs, dicky injector, fuel pump etc....but the melted piston would have been caused by the off bosst lean mixture. That was my point.