If anyone remembers earlier this year my jeep was making a terrible hissing noise and I thought it was my down pipe flange, well I fixed that leak at the down pipe (thanks everyone) but it turns out that wasn't making the noise. So I figured it was just another exhaust leak somewhere and since I had about had it looking for exhaust leaks I took it in to the shop; big surprise they couldn't find any exhaust leaks either they actually complimented me on how well the exhaust system was put together. Then I went to second shop and a third shop, no leaks, they couldn't all be wrong.
The only explanation now is that I don't have an exhaust leak.
Sounds like air escaping or being sucked in, like a hiss or an air compressor blower attachment(technical term). It only happens when the engine is loaded up, going up a hill or high rpm, if you drop it in neutral and rev it the hiss is immediately gone. Its not a quiet hiss either, at around 3,000 rpm its louder than my exhaust and engine (I have a flow master super 44)
What I have done so far:
-Replaced all the vacuum-hoses and connectors I could get to
-checked for manifold leaks with my handy dandy spray bottle
-cleaned and inspected throttle body and replaced gaskets
-changed air filter
Nothing has been changed on the engine, no throttle body spacers, no CAI, its all stock.
I haven't noticed any other problems with the jeep, it idles fine and runs smooth it just makes that horrible noise! Help its driving me nuts!