I am having trouble with what sounds like restricted exhaust with my 2000 F-250 SD diesel. I have done some research and sounds like it may be the EBPV, or the sending until. Would either of these cause restricted exhaust flow. This only occurs when ambient temps are around 20-30 degrees if that makes a hill of beans difference. Any help would be greatly appreciated.

 

It sounds like a stuck EXHAUST BACK PRESSUE VALVE. On warm up this valve gets stuck and lets the motor heat up faster but when you hit the brack it releases and opens up the flow, i think i got that right, but anyways, mine has done it 2 or 3 times before. How to fix, others will be here in a few. Welcome to FTE, you can't go wrong here..

 

If its that "jet" sound coming out of the exhaust when its cold, thats normal. however, it should release when throtle is applied but it will reset if its not warm enough. The PCM looks at intake air temp, engine oil temp, and engine load. I did have a 97 PSD that the EBPV would activate at cruise if it was below 0 temp outside,after about 5 miles of driving the oil temp would finally get warm enough to turn it off. Barney

 

The EBPV is a butterfly valve right behind the turbine housing of the turbo. It is designed to restrict exhaust flow in order to put an artificial load on the engine. This load helps to warm the engine up faster in cold weather. This is also coupled with the high idle feature, and air intake heater. When the EBPV is activated, you can hear a hissing or jet noise out of the exhaust pipe. This function is completely normal.

There can be problems with the EBPV. When you begin driving and apply the throttle, the EBPV should immediately open up. If it is not opening, your truck will run extremely sluggish and it will be almost impossible to even get over 25 mph. In this case, it is rarely the EBPV itself that is stuck, rather the PCM is not opening it up. The PCM relies on a sensor that reads backpressure in order to open the EBPV. This sensor sits on the very front of the engine right behind the idler pully, and is connected to the passenger's side manifold via a long metal tube. This tube commonly gets plugged with soot, preventing the sensor from being able to read correct backpressure. If your EBPV is staying closed when accelerating, you need to remove the sensor and tube and clean it out. Here are instructions on how to do that: Welcome to guzzle's Exhaust Backpressure Sensor Cleaning Maintenance Web Page

 

Thank you all for the info, sure do appreciate it. I will try to get to cleaning out the tube from the PCM to the EBPV later on today and let you know what happens. Take care.