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Old 08-25-2012, 09:56 AM
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new noise!

so my 97 f250 7.3/zf5 just made the 6 hour journey to wyoming. ran like a champ all the way here. now when i leave a stoplight or give her a little gas, theres a kind of hissing noise that i hear coming from the engine bay, it does not get louder/faster with more RPMs, but if it rev it and let off it quits, ideas?

and YES i know what a turbo sounds like! haha

Last edited by redpowersmoke; 08-25-2012 at 12:14 PM.
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Old 08-25-2012, 12:25 PM
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Only things I'm coming up with is a boost leak or air intake leak. Is your air filter getting clogged?
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Old 08-25-2012, 12:27 PM
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Quote:
Originally Posted by Gene View Post
Only things I'm coming up with is a boost leak or air intake leak. Is your air filter getting clogged?
my air filter is clean but i was just thinking of that, boost leak being on the y-pipe that goes to each valley and intake leak being the boots pre-turbo correct?
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Old 08-25-2012, 12:36 PM
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Yep. That's what I was thinking.
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Old 08-25-2012, 01:25 PM
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Quote:
Originally Posted by Gene View Post
Yep. That's what I was thinking.
you were correct!, the orange boot that connects the turbo to the cast tube has a tear, after calling around the only place that carries it is fors, i think ill just rip it all out and go AFE. does that sound like a good excuse?
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Old 08-25-2012, 01:39 PM
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Sounds like a good excuse to add an intercooler.
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Old 08-25-2012, 06:19 PM
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Originally Posted by Gene View Post
Sounds like a good excuse to add an intercooler.
that sounds even better BUT being a broke azz college kid, the afe is a little more reasonable
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Old 08-27-2012, 10:59 AM
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RiffRaff has your boots for $20....more money for beer, ah , I mean books.
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Old 08-31-2012, 01:56 PM
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ok new issue!, put on my AFE this morning, still made the hissing noise, i realized that my oil was about 3k miles old and was just ran 2000-2500 rpm for 6 hours straight, i just did an oil change and the noise seemed to stop, but i noticed that my truck is taking longer to crank now and upon starting it fires then a second time and smoothes to idle. also, i gassed it to turn around in some dirt and when i let off the gas pedal the rmps went way down, almost to dieng, then it caught itself and ran fine. hpop? icp? any ideas? seeing as the OBS uses a heui system thats what i could come up with
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Old 09-01-2012, 07:36 AM
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What oil did you use? 3000 miles shouldn't be bad on these if you are using the correct oil.

An ICP problem is easy to troubleshoot. Just un-plug the ICP and drive it for a while to see if the problem goes away. Normally, an ICP loses it's seal first. There will be some oil in the plug, or a leak where the ICP goes into the head.

If you have an HPOP problem, there will likely be a HUGE oil leak.
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