new noise!

[redpowersmoke]

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

[Gene]

Only things I'm coming up with is a boost leak or air intake leak. Is your air filter getting clogged?

[redpowersmoke]

Originally Posted by Gene

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?

[Gene]

Yep. That's what I was thinking.

[redpowersmoke]

Originally Posted by Gene

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?

[Gene]

Sounds like a good excuse to add an intercooler.

[redpowersmoke]

Originally Posted by Gene

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

[BigFuel]

RiffRaff has your boots for $20....more money for beer, ah , I mean books.

[redpowersmoke]

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

[Gene]

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.