99 7.3 loss of power HELP! - Ford Powerstroke Diesel Forum
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post #1 of 26 Old 01-03-2013, 01:54 PM Thread Starter
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99 7.3 loss of power HELP!

I have a 99 7.3 F350 and these last few days ive been noticing that my throttle isnt what is used to be. the truck runs and cranks fine and idles like it always have. its like now im having to press the petal twice as much as i did before just to get it up and going. ive got 22.5s on it and the tranny was built about a year ago. the truck still shifts fine and drives like normal but its just like its lost half of the power it once had. i looked under the hood and noticed alot of black soot around the 2 pipes that go into the front of the turbo at their couplings. maybe there leaking to much air?? also there is no skipping so i didnt think it could be a fuel problem? any input would greatly help thanks guys

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post #2 of 26 Old 01-03-2013, 08:38 PM
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yea, it's probably the up pipes you noticed billowing out smoke. those feed the turbo. if they leak, you lose turbo performance. that's probably where your lack of power has resulted

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post #3 of 26 Old 01-04-2013, 03:32 AM Thread Starter
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Ok where can I buy some new ones with the couplings? Maybe some aftermarket ones?


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post #4 of 26 Old 01-04-2013, 04:18 AM
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Riffraff sells early and late up pipes

Colin S. Age:22 Certified Diesel Tech, Infantry US ARMY
E99 7.3 6spd 4x4 6637, 4" straight pipe, 365,000 miles
"wear your high mileage as a badge of honor"

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post #5 of 26 Old 01-04-2013, 05:00 AM Thread Starter
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i noticed the pipes that were leaking was the pipes that run from the inter cooler to the front of the turbo that you can see when you pop the hood. isnt the up pipes on the back of the turbo you cant really see them

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post #6 of 26 Old 01-04-2013, 05:08 AM
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Yes, you're talking about the intercooler pipes that go into the spider. Boost leaks will cause a loss of power. Take them off, clean them with a good degreaser and reinstall and then try it.

The CCV mod will help with this too.

The up pipes are what feeds the back of the turbo from the manifolds. If you see soot there, you might want to look into replacement bellowed up pipes or new gaskets.

Dieselorings: International Bellowed Up-pipe Kit 99.5-03
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post #7 of 26 Old 01-05-2013, 07:13 AM
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Quote:
Originally Posted by jec92 View Post
i noticed the pipes that were leaking was the pipes that run from the inter cooler to the front of the turbo that you can see when you pop the hood. isnt the up pipes on the back of the turbo you cant really see them
LMFAO. sorry. didn't see that you said FRONT. however, if there is soot, it's exhaust. and wouldn't be leaking out the charge pipes. i'd want to find out where the soot is coming from first and foremost. could be the downpipe (which wouldn't really hinder performance), could be the up pipes, rear flange, or could even be the turbo itself

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post #8 of 26 Old 01-09-2013, 01:10 PM Thread Starter
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99 7.3 loss of power HELP!-imageuploadedbyautoguide1357769311.486560.jpg99 7.3 loss of power HELP!-imageuploadedbyautoguide1357769320.818777.jpg99 7.3 loss of power HELP!-imageuploadedbyautoguide1357769331.419255.jpg99 7.3 loss of power HELP!-imageuploadedbyautoguide1357769340.302382.jpg
Here are some pics of where the soot is is on my pipes, I believe they may be leaking from the rubber couplings that join the pipes, could that be my problem for loss of power? Can't really tell exactly if that's where there coming from. Again the power loss isn't ALOT, but it's enuff to notice


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post #9 of 26 Old 01-09-2013, 03:24 PM
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Yes. That is definitely your problem. You really need to look into doing the CCV mod. In the mean time, take both intercooler pipes off and clean them as well *** the IC boots with a degreaser. You'll most likely see oil in these pipes when you take them off, but don't worry it's normal.
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post #10 of 26 Old 01-09-2013, 04:41 PM Thread Starter
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How am I losing power with them just being dirty tho? I'm not doubting you at all I just wanted to know the reAson for how it would make my truck lag so much.


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