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Whistle under load!!HELP

3K views 12 replies 7 participants last post by  Redhot99Ws6 
#1 ·
Ok so I have a 99 wrangler 4.0 ax-15 all factory 152k on her.I noticed a high pitched whistle while accelerating from up front somewhere.Any and all gears usually from 1100rpm-1500rpm.Now it's not all the time usually randomly and if I ease off the gas while it's making the noise it will go away.It's annoying the hell out of me and I do not know where to look.Hope somebody can help!!
 
#6 ·
My guess would be a lumpy weld protrusion in the exhaust pipe. Had any exhaust system work done recently?
 
#7 ·
The wife's jeep had a whistle under the hood and it turned out the po replaced the rear ccv line from the valve cover to the intake with a 5\8" heater hose,,, wrong thing to do as its a restricted line.
Once I fixed it no more annoying noise.
 
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