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Unread 12-13-2012, 06:22 PM   #1
deitzberg
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1998 XJ Cherokee 
 
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High pitched whine when I let off the gas.

I have a 98 xj with a straight six. When ever I let up on the gas pedal I hear a high pitch whining. As soon as I hit the has even in the slightest it goes away. I did just have a new exhaust system put in so its actually a lot quieter so I dont know if it was there before as well. Any thoughts?

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Unread 12-13-2012, 07:23 PM   #2
CCKen
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Quote:
Originally Posted by deitzberg View Post
I have a 98 xj with a straight six. When ever I let up on the gas pedal I hear a high pitch whining. As soon as I hit the has even in the slightest it goes away. I did just have a new exhaust system put in so its actually a lot quieter so I dont know if it was there before as well. Any thoughts?
Is this with the Jeep in motion, or standing still? Is the whining definately coming from the engine?
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Unread 12-13-2012, 07:39 PM   #3
deitzberg
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Both. Its not the belt I just replaced it a few thousand miles ago and I just made sure it was tight. It seems like it is coming from the front.
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Unread 12-13-2012, 07:52 PM   #4
CCKen
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If you hear it while the Jeep is not in motion, try raising the hood and adjust the throttle by hand while listening for the whining. Sounds like a vacuum leak in a way, but could be the power steering pump, water pump, or anything in motion.
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Unread 12-13-2012, 09:21 PM   #5
Winterwheeler
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A family 87 Cherokee Laredo also produces a high pitched whistling sound at idle once it's warmed up. Someone suggested it could be a leaking intake manifold gasket. I would like to know how to diagnose this issue and get info on how urgent it might be to deal with.
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Unread 12-13-2012, 09:35 PM   #6
wgirvine
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Hate to say this but a high pitched whine when you are running down the road and let off, usually means ring and pinion gears are worn.
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Unread 12-16-2012, 03:57 PM   #7
deitzberg
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Quote:
Originally Posted by Winterwheeler View Post
A family 87 Cherokee Laredo also produces a high pitched whistling sound at idle once it's warmed up. Someone suggested it could be a leaking intake manifold gasket. I would like to know how to diagnose this issue and get info on how urgent it might be to deal with.
that is what I am leaning towards as well. I just had the exhaust manifold replaced. I read somewhere that the bolt in the back sometimes comes loose a hair and causes the sound. I just sucks that I had the work done in ohio and I cant take it back for them to deal with it since I am in PA next to jersey.
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Unread 12-16-2012, 05:10 PM   #8
deitzberg
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I just got done tightening all the bolts on the exhaust/ intake manifold. I let it warm up for 10 minutes and drove it for another 10 and I dont hear the noise. Hopefully that was the cure. I did find one bolt against the firewall on top that was a little loose. I will check back in at the end of the week for the final decision.
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Unread 12-17-2012, 12:48 PM   #9
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@winterwheeler the easiest way to figure out if you have a vaccum leak is to start it, pop the hood, and spray the engine bay down with some carb cleaner or something similar. If it revs up you have a leak somewhere
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Unread 12-17-2012, 04:12 PM   #10
OnTheFence
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Can you take a photo of the exhaust/ intake manifold bolt that was loose?
I hear this is common. I'd like to check mine!
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Unread 12-17-2012, 04:25 PM   #11
deitzberg
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I will post one tomorrow afternoon.
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Unread 12-17-2012, 06:25 PM   #12
mschi772
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EDIT: deleted unnecessary reply
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4.0 liter , 98 jeep cherokee , whining noise , xj

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