Hey guys, I've been coming to this site for the last 4+ years getting great advice on all things Jeep. Now I've come to something that I can't really find in the forums, and I'm just looking for ideas on what could be up with my Wrangler.
A couple of weeks ago while on the freeway driving to Atlanta from Auburn I noticed a high pitched whistling/whirring coming from my engine compartment. It only occurred when I have been driving for a while (15 minutes +), and only when my foot was off the gas. When accelerating or giving it gas, the whistle/whir went away.
At first I suspected the vacuum hoses or throttle body spacer (installed before I bought the Jeep). I have since removed the throttle boy spacer and checked the vacuum hoses (along with replacing the power steering pump, water pump, thermostat, and thermostat housing which was a whole adventure in and of istelf), and the whistle/whir is still present under the same conditions as before.
OK, I'll try those bolts on the intake manifold tonight when I get off work then. Hopefully that will fix it. I don't think that it's hurting the jeep, it just gets really annoying on long road trips (repeated trips from Auburn to Atlanta or Birmingham every other week or so at 2 hours a pop).
Not to hijack this thread's main topic of noise issues, but my Corbeau A4 drivers seat just kind of broke. The seat won't go fully upright. If I have serious problems with that I may start another thread though to see if anyone has had problems with those seats.
I tried tightening down the intake manifold and it may have helped a little. Not a lot of road use yet so I can't truly comment on whether the noise has stopped. I'll also get under the jeep today to check the vacuum hoses.
Let me know when you find out. My brother has the same issue and it only happens after driving for a while. We would hear it and pull over real fast to try and find it but you have to be quick before it goes away. We could never pin point it.
Had the same issue for about six months on my 03 Rubicon. The noise kept getting worse, even accelerating wouldn't make it go away. Finally had a leak test confirm a shot intake manifold. Replaced and no noise since. Back to enjoying my Jeep.
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