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Old 04-30-2010, 10:25 PM   #1
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Whining noise help

I have a 2000 TJ 2.5 litre Wrangler. Over the last week or 2 I have a whining noise coming from the engine or cam that is getting loader and loader. It comes on after the engine has been on for a minute or 2. It does not seem to whine while accelerating or the whining is not as bad. When I press down on the air intake the whining changes pitches. I took it to a shop and they hit the engine with some spray and it stopped for a short period of time. Because of this I figured it was a leak somewhere. A buddy and I took off the engine case to see if the seal was leaking. We put it back on and the noise is still there. The guy at the shop said it was possibly the cam or cam seal, or could possibly have something to do with the air intake. Any ideas on what would be causing the engine to whine and what do I need to do to replace it. I think me and my friend can fix it if we knew what the problem was.

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Old 05-01-2010, 07:42 AM   #2
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Is it a whine or whistle?
If you push on the air intake and it changes or stops the noise, start there and make sure everything is seated properly and tight. The noise may exist all of the time, but you do not hear it at high idle (first minute or so after startup) or while accelerating due to engine noise.

Where and what did they spray? My guess would be that they sprayed belt dressing on the fan belt and are trying to charge you a lot of money to change a belt. There is no relationship between the air filter housing or intake tube and the camshaft. There is nothing you could spray on the outside of the engine that would do anything to the camshaft. Find a new mechanic.
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Old 05-01-2010, 09:47 AM   #3
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Maybe it is a whistle. It's a high pitched noise that is at the back of the engine. When I take the air intake off it's still there. It almost sounds like it is coming from the fuel injectors. It's in the basic area. We thought it might be the seal, but that was not it. And as far as what they sprayed I have no idea. They said that they would have to machine a part of the engine. Any ideas. If not then I'll take your advise and go to another mechanic.
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Old 01-06-2011, 11:11 PM   #4
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2000 TJ 101,000 miles
My high pitched whine was worst as engine warmed up and at idle or steady throttle. After going thru all these posts I decided it had to be a vacuum leak at the intake manifold. Took a torque wrench and checked each manifold bolt to proper torque. Found the 11th bolt (topside closest to firewall) had worked loose by half a turn. Tightening it down cured my whine. If it comes back and all my bolts are tight then I know the next step would be to remove manifolds, check them for warping and install with new gasket and bolts.

Good luck with your whiny ride.
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Old 11-06-2012, 06:52 PM   #5
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My whine ended up being some loose bolts on the intake manifold. Found this out after I replaced two pulleys, the serpentine belt, and the water pump..
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Old 04-28-2013, 11:43 AM   #6
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I looked to be lucky with alooae bolt, however Mine is a crack by the bolt...

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