In neutral, no rpm drop?

[Joe_Bloe]

My Lincoln LS would do this too. If I wanted to coast in neutral down hill, the RPMs would match what it would do in gear. That quickly cured me of the desire to coast in neutral in that car--made me want to sell the car instead.

[tru]

has anyone corrected this "feature"?

A coworker suggested i unplug my IAC valve and see what RPM's the vehicle will run at idle and while coasting. He mentioned the throttle body may need to be adjusted or modified to allow the vehicle to just idle at a satisfactory RPM. Id really like to try this but want some back up on it before making the attempt

[Ladogaboy]

I'm curious why automatics can't do what manuals can in terms of complete fuel shut off. When I am coasting downhill in gear, my mpg becomes infinite because the fuel system stops feeding the engine fuel. Basically, the downhill momentum of the car keeps the engine and all accessories turning without the need for combustion. So in the case of automatics, is it the torque converter that prevents this?

[Formula413]

Auto cars have DFCO too

[tru]

I noticed today if i tap my brakes at the beginning of the coast my RPM's seem to drop more. im going to try to validate this theory thru out the week.

anyone else wanna check on this?