Exhaust Brake ON whith Cruise Control ON??
I usually have the exhaust brake off, and turn it on when I need it. The other day, I had forgot and left it on. I had the cruise control set and started going down a long grade. As the speed pic...
Forum Discussion
Ray,IN wrote:wolfe10 wrote:
I am not sure that use of the exhaust brake is hard on the exhaust manifold.
Remember, with the throttle closed, ZERO fuel is injected. Zero fuel means zero additional heat. So, if the manifold is hot from a long climb, once you crest the hill, I don't see a problem with the exhaust brake on-- that will slow the cooling rate, but certainly not add to the heating rate.
How does a diesel idle if ZERO fuel is injected? Isn't the throttle closed then?
Ray, I assume it is like most modern cars with fuel injection, when coasting and engine rpm is above the idle set, it shuts off the injectors electronically. When rpm drops, it turns them back on.
Jeff
