tried shutting engine off in Neutral on long downhills, with key in ON postition there is a strange noise as if the engine is still ON but with no power, afraid this is not a good idea...can this damage anything?
with key in off position and coasting downhill the noise and drag are worse
any ideas what happens to auto-trans engines in glide/off?
Look in your owners manual. If it says that flat towing is not recommended for your car, then engine off neutral coasting is not recommended either. If you want to coast in neutral, leave the engine idling so the transmission pump is still running and circulating fluid through the transmission.