7.3 Powerstroke Power Loss and Whooshing Sound at Part Throttle

[crf250guy]

Hey guys,

My truck is making a whoosing sound accompanied by major power loss at part throttle cruising. Just started this morning. If I floor it, the sounds will slowly go away followed by the turbo spooling up and the power returning. Any ideas on what to look for??

Thanks

[SCUFFY828]

the exhaust back pressure valve is shutting , it must be cold there , if so , thats normal until warm up

[95dieselsmoke]

Originally Posted by SCUFFY828

the exhaust back pressure valve is shutting , it must be cold there , if so , thats normal until warm up

+1 mine started doing it recently too because of the cold weather

[crf250guy]

That makes sense, its the coldest day we've had yet, but the truck is fully warmed up. When I dropped the hood closed it kicked back up to high idle again until I hit the brake pedal. Any ideas?

[SCUFFY828]

the ebp apparantly is still thinking its cold, you say it is up to operating temp

[crf250guy]

I believe so, I let it warm up for 15 min and then drove it 5 miles and it was still doing it when I got back to the house. Gauge appeared to be in the right place. Should I try driving it some more?

[SCUFFY828]

i would , if it goes away when hit the brake or accell, then its working properly , if it doesnt after some driving let me know

[crf250guy]

Well, I ran around with it all day yesterday. Even after it was fully warm, I could feel the ebp closing, until the weather got warmed up. Then on the drive home last night it started back up again. It seems like it is more affected by outside temperatures than by engine temp. I did notice that the whooshing sound is much quieter after the truck is fully warmed up, but I can distinctly hear it go away when I accel or decel. Its almost like its not closing as far. Is this incorrect operation?

I have had the truck for 6 months, so I've never had a diesel through cold weather like this. Thanks for the help.

[Vickerymarine]

I have an issue with 99 7.3l, sounds similar, but maybe not. Occasionally when I am driving (most all speeds) and hit a rough spot in the road, my engine seems to develop alot of power all of a sudden. Then, if I run over some more rough road, it seems to go away as quick as it came. Very strange symptom. Can anyone help?

[SQUID135]

Sounds like the same problem I have, Very slow to shift from 1st to 2nd (automatic) followed by smoke till I hit it hard then finally moves..Im stumped