Loss of power, black smoke, and hissing noise

michande04 · #1 (**permalink**) 11-30-2006, 10:29 AM

96 F250. When trying to remain at a constant speed I get a sudden but brief loss of power, maybe a couple of seconds, it will go away as soon as I adjust the accelerator pedal. At the same time I do that I will get a burst of black smoke out of the tailpipe and a hissing noise. It seems more prominent in cold weather than in the summer time. I am not for certain but it also seems as though I am getting worse fuel mileage. Any ideas?
Mike

**pipelayerjdh** · #2 (**permalink**) 11-30-2006, 12:15 PM

Try disconnecting the Exhaust Backpressure Valve.

**Marty** · #3 (**permalink**) 11-30-2006, 12:56 PM

BP valve.

When all I could see was "loss of power, black smoke" I thought it was a ic boot blown off...

michande04 · #4 (**permalink**) 11-30-2006, 01:37 PM

Thanks a bunch guys. I disconnected the wire going to the BP and no more issues. For the time being. What makes that push out black smoke when I get that loss of power?
Once again thanks to everyone's help. This forum has probably saved me a couple thousand dollars so far and I am a new guy.

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