cold drivability

[snydley]

I own a 97 F-250 7.3L my problem is: When the weather is cold 20`s or below, the truck starts & idles fine; But when I hold the throttle steady @1200 or anything over that the engine makes a hiss noise and rpms start to drop truck loses power. Itdoes this while in PARK or @ low speeds in traffic as long as I hold throttle steady. It recovers when I give it more throttle. Only does this when it is cold even if it`s been plugged in. Truck does not do this in warmer temps. Help is deeply appreciated!

[kylev90]

My 95 does the same thing. I was told it is your EBPV. From what I understand it is basically like an exhaust brake on the turbo that closes when the turbo doesnt need to build boost to help warm the motor by keeping heat in. Sounds just like pure rushing air coming from the exhaust? If its the same thing I was told it is normal and nothing is wrong. It is annoying though..... If you unplug the little harness on the very bottom right of your turbo it will stop doig this but I tried it and the turbo wouldnt spool like normal. Good luck

[Philly-5]

He's right, totally normal.

[PSD97]

Yup, EBPV. I unplugged mine about a month ago and noticed a big difference.