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Old November 13th, 2007, 12:05 PM   #1
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Default ford 7.3 losing power after deceleration

If you're going 60mph and let off the gas slightly, or let off the gas fully to coast, and you go to hit the gas again, the truck doesn't have any power and blows a ton of black smoke. It starts having power after a 15-20 seconds.

Seems like it would be turbo oriented, but I'm not a turbo guy.

Any ideas?
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Old November 13th, 2007, 12:12 PM   #2
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leaky boots? or blow off valve is not working properly...my 2 cents..prob not worth much tho..
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Old November 13th, 2007, 12:14 PM   #3
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Quote:
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leaky boots?
Do you mean the rubber hoses from the turbo to the intake?
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Old November 13th, 2007, 12:15 PM   #4
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Quote:
Originally Posted by clarkstoncracker View Post
Do you mean the rubber hoses from the turbo to the intake?
yes
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Old November 13th, 2007, 12:16 PM   #5
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how menny miles? what year is it, do u have a chip, or any other preformce mods?
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Old November 13th, 2007, 12:19 PM   #6
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how menny miles? what year is it, do u have a chip, or any other preformce mods?
not sure of the year. This is one of our construction trucks, big ol' KUV. No performance mods, stock. I had some starting issues with it 6 months ago or so and replaced the glow plugs. Its worked perfect. Just had a guy call me saying he doesn't know if he will make it back to the office.

It has around 100,000 miles Maybe a 2000ish?
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Old November 13th, 2007, 12:29 PM   #7
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Quote:
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leaky boots? or blow off valve is not working properly...my 2 cents..prob not worth much tho..
that being the case, i would go with this guy
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Old November 13th, 2007, 01:08 PM   #8
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ton of black smoke usually means not enough air

check the filter and tubes/boots like mentioned, and check the plastic intercooler housing for cracks.

I don't think there is a blow-off/wastegate on your motor.
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Old November 13th, 2007, 01:11 PM   #9
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Quote:
Originally Posted by Bones View Post
ton of black smoke usually means not enough air

check the filter and tubes/boots like mentioned, and check the plastic intercooler housing for cracks.

I don't think there is a blow-off/wastegate on your motor.
X2............this is gonna sound stupid, but,...............have you changed the air filter in the last 25,000 miles?
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Old November 13th, 2007, 01:27 PM   #10
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Sounds like the exhaust backpressure valve is sticking closed. Have him look for a big butterfly valve in the exhaust after the turbo; find the solenoid and unplug it.
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Old November 13th, 2007, 01:41 PM   #11
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Yes there is a wastegate. Unplugging the EBPV will not unstick it if it is stuck close. But I highly doubt the EBPV is stuck close. As this will not cause black smoke. It will cause slight loss of power but not what you are discribing.

You have a boost problem most likely. This would be caused by a bad intercooler tube boot. They are known to go bad especially if you have factory ones.

What happens is the crank case vent goes into the intake. That coats all the intercooler tubes with oil. Eventually the oil saturation in the tubes gets where the boots at the tube connections will allow the boots to slip off. Even with stock truck this can happen. What you will have to do if this is your problem. Is remove the boot clean the connection point with a degreaser I use brake cleaner. Clean it real real good. Then with a new boot which are around 32 dollars each from the dealer and new clamps install the new boot. Tighten down the clamps as tight as you can get them. Also some say that hairspray will help hold the boot inplace but I have not had any good results with that. Also as already mentioned check the intercooler for leaks. They have a tendancy to crack they are plastic. If you would like CC I could come take a look at your truck.

If your having loss of power and lots of black smoke then you have a boost problem. Another thing is your turbo could have gone bad. Air filter restricted.
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Old November 13th, 2007, 02:26 PM   #12
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My EBPV stuck near closed and anytime I tried to accelerate it was lots of smoke and no appreciable acceleration.
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Old November 13th, 2007, 02:36 PM   #13
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thanks for the pointers, I'm going to try all of this
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Old November 14th, 2007, 08:24 AM   #14
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Just checked everything you guys told me, and everything appeared to be in good shape. I drove it to see what he was talking about, and its blue smoke, not black

Does unburned diesel yield blue smoke?
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Old November 14th, 2007, 09:38 AM   #15
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blue smoke (mainly oil and unburnt fuel) indicates a poorly serviced and/or tuned engine
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Old November 14th, 2007, 12:18 PM   #16
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my guess is a boost leak. if you are venting off air that has been meetered by the maf the computer will add more fule to compensate ( black smoke)
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Old November 14th, 2007, 12:35 PM   #17
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Did you put gas in it? Check the tire pressure? Sometimes it helps to kick the tire!


Seriously, since you are decellerating first to reproduce the problem, the first thing I thought of was your trans kicked down a gear (or locked into OD) but did not release out of Overdrive when you accelerted again.

Therefore, putting more strain on the engine.

Just a thought....
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Old November 14th, 2007, 12:45 PM   #18
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I thought it was because its a ford...

Time to do a cumins swap and have a real motor!
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Old November 14th, 2007, 01:03 PM   #19
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oil leaks - injector o-rings, turbo leaking oil, blowby (unlikely)

let me know when you can't figure it out and want to sell it!!
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Old November 14th, 2007, 02:27 PM   #20
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Quote:
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I thought it was because its a ford...

Time to do a cumins swap and have a real motor!
thanks ....didn't you move already

No check engine light I assume CC?
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