new guy here with couple performance issues - Ford Powerstroke Diesel Forum
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post #1 of 2 Old 12-16-2013, 07:25 PM Thread Starter Rookie
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new guy here with couple performance issues

I have a 99 f350,7.3 powerstroke.on the passenger front fender well under the hood theres some sort of vacuum can? Anyone know what this is? Also when cold it sounds like the motor kicks down and you hear a sort of hissing noise then clears up and does it again etc... til warm and if your driving its like its got no power when it does this,any ideas?and one last thing it seems to shift real hard only from 2nd to 3rd gear when ur steppin on it,its a automatic,but if u baby it it shifts nice,im afraid to accelerate hard at all.only between 2nd and 3.sorry bout all the ?s but im new to this and want to learn!:-) thank u
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post #2 of 2 Old 01-04-2014, 06:40 PM Rookie
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The can is a vacuum reservoir for the heater/AC controls and the 4X4 hubs. The noise and lack of power is from a back pressure valve on the turbo outlet. With engine oil temp below about 40 degrees (F) it comes on to help engine warm up. The hard shift under hard throttle (depending on how hard) is normal. When the trans starts to feel lazy and sloppy that's when I'd worry. Hope this helps.
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