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Exhaust BackPressure Valve Hissing while driving

3082 Views 1 Reply 2 Participants Last post by  klhansen
Today i left to go to the gym and my truck seemed to be running completly fine, when i got to the gym i had time to kill before they opened, so i started pulling and checking fuses to see if any were blown and contributing to a pre-existing non related problem. Once i finished at gym i got in my truck and let it warm up all seemed normal, until i pulled onto the road and the truck was hissing (same sound as Exhaust BackPressure valve) while i was accelerating. I practically rolled the truck back home at idle. The hissing noise only starts when my foot is on the gas pedal once back at idle it stops. Once i got home i relized there was a puddle of fresh oil in my parking spot. I climbed under the truck and i cannot tell where the oil is coming from but it is leaking and dripping onto the front axle and then onto the ground.

I rechecked to make sure i put all fuses back in correct location that i pulled. When i pulled fuse # 27 (Ignition Run Power Feed (Customer Access) the previous owner had shoved a wire inbetween the fuse and fuse box that is going to what i am assuming is the remote start he added to the truck. When i put the fuse back in, it does not want to stay in on its own unless the wire is jammed back in with it and i cannot tell if it is making a connection or not.

I am almost certain that i have all the fuses back in correctly, with the exception of #27.

I am assuming this problem has to do with the exhaust backpressure valve, seeing that the oil spot was there when i returned home and being there prior to any fuses being pulled.

Any help is Greatly Appreciated
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The fuse issue is typical for a rednecked added power point. The fuseholding jaws have been overstretched, and the only way to fix it is to disassemble the fuse box and bend them back in place.

On the EBP valve closing, the tube going to the EBP sensor is likely completely plugged, and the PCM is trying to regulate valve closure without a signal. Pull the tube and clean the soot out of it (carb cleaner and weedwacker string), or replace the tube. Also ream out the fitting at the exhaust manifold.

On the oil leak, you're going to have to clean things up and track down the source.
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