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Odd sizzling sound?

2259 Views 22 Replies 11 Participants Last post by  jon_7248
Now this is going to sound weird. For about a month maybe I have been hearing this sound while im on the highway. I have an Xcab so I can lean the seat back to try to find where it's comming from. It sounds like it's from the middle of the truck, maybe slightly to the driverside. But here is the deal. It sounds like a sizzling sound and only happens when I go over 50mpg and cruising. If I accelerate, it goes away and when I dont use the throttle at all it's gone too.

I cant figure out for the life of me what it is! I thought it was just something flapping in the wind like some tape or something, but it's deffinatly related to the throttle, and only at cruise... in other words just barly giving gas at all!

Any ideas????
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Dont think so. One, my collant level is fine. And two, it's comming from under the back of the Xcab part, where the people in the back would be sitting.
Where is the carrier bearing?
Dont think it's an exhaust problem either. I have had exhaust problems before on my old 4runner and you can tell when your exhaust is broke while the truck is in the driveway. This sound doesnt exist in the driveway. It's like a vibration effect at high speeds which would be why I only can hear it about 50ish mpg. Someone else has the same issue and found it to be their headliner. If it helps, it's like an old window seal that doesnt seal right, or a window is slightly a crack. Not like an exhaust.
Ahh not used to the new type of rear driveshafts...used to one peice.

Hmm, now the thing that amazing me is that if it needs lube, the dealer should be greasing it during oil changes. I remember the dealer doing it on my old 4runner all the time and they where great about it. But I dont live in san antonio anymore. The rule still applies that they grease all the zirks underneath during oil changes right? The dealer in san antonio was telling me that something they do on all the trucks/suvs during oil changes. But I never get a car wash like I do up here so I guess I have to sacrifice something :)
I remember we placed some nice nuts on a drive shaft with zip ties once... then we opted for the JBweld solution for better fitting. Man he was pisssed.
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