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Lead Driver
Joined: Nov 2007
Posts: 5,578
Likes: 1
Well our 7.3's have a Exhaust back pressure valve (EBPV)... This is a valve that closes off the exhaust thus kicking up the idle of the truck and making it warm up faster. I dont know if yours is working or not but you should hear it... There are a few things that will cause this to not turn on. Like if you hit the brake, clutch throttle, or if you turn on your heater. Also if the outside temp is above a certain amount. I only let my truck warm up for about 5 min. before drivng. It isn't of the cold mark yet at that point but about four blocks down the road at 1500rpm or so and its just fine... Hope this helped ya out!
P.S Welcome to FTE!!!
P.S Welcome to FTE!!!
Laughing Gas
Joined: Jul 2003
Posts: 1,157
Likes: 1
From: Littleton, Colorado
The 7.3L can idle forever and not come up to operating temperature when it's cold enough outside. Excessive idling can cause a number of problems on diesels. I start her up and let it idle for a minute or two and then just drive nice and easy until it warms up. A lot of people let their cars idle till warm, hop in and drive like hell, damaging other things. Everything needs a chance to warm up slowly like the tranny, axles, etc. until the fluid functions best.
The back pressure system 4inch was talking about is controlled by the PCM to provide more heat to the coolant for cab heating when ambient air temperature is below 7°C (45°F) and engine oil temperature is below 75°C (167°F) during low load, low speed operating conditions.
Are you having a problem, or just wondering what is average characteristic of the 7.3L? If you're used to a gasser it seems like forever to warm up the 7.3L.
Austin
The back pressure system 4inch was talking about is controlled by the PCM to provide more heat to the coolant for cab heating when ambient air temperature is below 7°C (45°F) and engine oil temperature is below 75°C (167°F) during low load, low speed operating conditions.
Are you having a problem, or just wondering what is average characteristic of the 7.3L? If you're used to a gasser it seems like forever to warm up the 7.3L.
Austin
