1999 7.3 F250 power loss when cold - Ford Powerstroke Diesel Forum
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Old 10-29-2013, 03:38 PM
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1999 7.3 F250 power loss when cold

Just bought my first Powerstroke and am having problems when the air temperature is low. The engine makes a "shh, shh" sound and I can feel it lose power unless I'm really pushing the throttle. After the day warms up its fine but I plan on plowing snow with this and have to solve the problem asap. I know it has an aftermarket Garrett turbo and is not chipped. No gauges besides stock. Please and thanks for your help.
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Old 11-06-2013, 09:21 AM
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For more replies, you might try moving this over to the 99 - 03 forums.
OBS trucks have what is called a EBPV, or exhaust back pressure valve, just a fancy name for a exhaust brake that is controlled by the pcm. When it is cold out, the pcm closes it to decrease warm up time.
I do not know if Super duty's have these, just An Idea. How long do you let your truck warm up before you start driving It? If It is still making jet airplane noises after it comes up to temp, there could be a malfunction in the circuit that controls it, or it could be hanging up. I know on OBS trucks it is simple to wire in a switch to control It manually, but again, not sure on yours.
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Old 11-06-2013, 09:27 AM
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I let it warm up a good 15 minutes before driving it and also plug it in over night. It still makes the sound even when at operating temperature when the outside temp is cold. Any suggestions on wiring the EBPV with a switch so I can disable after is gets to temperature?

Thanks for your help!
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