I have a new 04 F350 with only 2300 miles on it. Every once in awhile, i will get a sound coming from under the driver side of the vehicle engine compartment that sounds like back pressure being released. It happens when i am up around 2000 or more rpms and let off of the accelerator. I am gonna take the truck into the shop the first of next week just to get it checked but thought i would ask here first. It only happens when i am above 2000 rpms though. Any input is greatful thanks guys

 

That is boost being released. If you accelerate quickly and quickly back off, the boost escapes. No, it doesn't have a waste gate. Subsequently you get that noise. It is normal for this system. It should be a wapapapa sound.

 

I love that sound, means I was going a bit fast and jumped off the throttle because I remembered how quick my 8k truck really is, then I remembered physics...how much energy it takes to slow 8k down….and I keep doing it again and again

 

Speaking of physics, lets take a look:

Energy = 1/2 x Mass x Velocity^2

With mass in slugs and velocity in feet per second.

Lets compare an Expedition weighing 8000 pounds traveling at 70 MPH to a 180 grain bullet traveling at 2500 feet per second.

Engergy of the Expedition.....1,310,430 ft-lbs
Energy of sniper Bullet...............2,498 ft-lbs

Or the expedition has 525 times the energy of a sniper bullet


Now to calculate the force each "projectile" has on impact we need to use the following formula:

F = MV/T

If the X stops in 1/2 second upon impact and the bullet stops in 0.0005 seconds upon impact (assuming 12 inches of penetration into a "medium") we have:

Force of the X........25,528 pounds
Force of bullet........ 3,996 pounds

Or the X imparts 6.39 more force upon impact than a bullet would.

Ain't physics grand?

 

ok thanks guys, this makes me feel better. I swithced over from a duramax so i am still getting use the the sounds of the truck. Tnanks for the help again

 

Way too much coffee for Sean....hehe

 

Am really curious on why you switched from the duramax. I've heard it is a really strong engine. I also switch over from GM, but I had the 6.5L. The 6.5L wasnt that strong of a diesel and really couldnt do much to it to improve it. I switch over for the drivetrain(solid front axle) and all the aftermarket upgrades are for the Fords and the duramax. Again, just curious. Thanks.
Jeff

 

The Durmax really does not hold a candle to the 6.0 running down the road.

 

cause after having 8 new injectors at 26k and never getting fuelmilage over 12 mpg again loaded or unloaded, i finally got ****ed off. Chevy had my truck for almost 2 weeks doing injectors, and after i get new ones i still have a loss of power and bad milage, so i dupmed it and got something i don;t have to worry about as much. The ford is alot stronger in my opinion. I pull a 7 ton trailer and it does great.

 

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Thanks

 

sorry i didn't even think about it while i was typing, won't happen again

 

No worry thanks for admitting it.
Keep posting...

 

did your crankcase fill with fuel. cheby had a big problem with that. reason why the 04 duramax was redesigned. One of my account is a cheby dealer, a mechanic there told me cheby has no defined way to determine individual bad/leaking injectors. they usually just replace a bank at a time because they are under warranty.

 

I have that problem occasionally when I'm aggrevated

 

Does this happen only when you are driving aggressively? I've never noticed it on my truck; but I don't really hear all that well.