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Whistling


 
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LoneSpar
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Joined: 19 Aug 2007
Location: Oregon

PostPosted: Fri Nov 09, 2007 5:08 pm    Post subject: Whistling Reply with quote

When my 89 XJ warms up, there is a whistling noise that is coming from the front of the 4.0 motor. When you rev the engine, it goes away, but returns when it goes back to idle. Any Idea's?????
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Old Chevy Trucks
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mr.civis
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Joined: 20 Mar 2008

PostPosted: Thu Mar 20, 2008 1:58 pm    Post subject: Whistling 4.0 Reply with quote

Hi, My Jeep with a 4.0 Has the same whistle, But today I waited until the whistling started, Then I put a 15mm socket with 1/2" Drive on the very back top mounting bolt of my intake manifold and tighten and the whistle stopped, I been on the road all day and it has not whistled at all. But now I can hear that I need to check my brakes they have a squeak that I couldn't hear over the whistling.

Now it may not be the last bolt on yours, it could be any of them or even all. Also torque setting for those bolts is 24 ft-lbs, I took it to 35 Ft-lbs on a hot Engine, and hopping it will be okay. If you don't have a Torque Wrench then just tighten until the whistle stops or bolt brakes.

You may need to replace manifold Gasket, $9-20 call around. But tighten the bolts will tell you if that is what is making the whistle.
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LoneSpar
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Joined: 19 Aug 2007
Location: Oregon

PostPosted: Fri Mar 21, 2008 8:21 pm    Post subject: Reply with quote

Thanks for the suggestion!!!!! I will give it a try! As it whistles, I try to hear where it comes from but I can't nail it down. The best I can get is the intake side of the motor!!
Thanks!
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tomynoks
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Joined: 11 Apr 2006
Location: Mesa, AZ

PostPosted: Sat Mar 22, 2008 8:31 pm    Post subject: Reply with quote

WOW.... I've had that prob for awhile. Even posted it here, but got no response. I will check that out tomorrow!!

Thanks,

Tom
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'99 XJ Sport
AirAid Intake
PowerAid Throttle body spacer
RE6030 3.5"
1" T-case drop
31x10.5x15 BFG AT KO's
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LoneSpar
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Joined: 19 Aug 2007
Location: Oregon

PostPosted: Tue Mar 25, 2008 10:17 pm    Post subject: Reply with quote

I followed your steps and the whistle is GONE!!!!!!!!! Thanks!!!!!!!
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tomynoks
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Joined: 11 Apr 2006
Location: Mesa, AZ

PostPosted: Tue Mar 25, 2008 11:46 pm    Post subject: Reply with quote

My whistle goes away pretty fast when i stop, but I was able to get a wrench on the forward header bolt and tightened it a little... the whistle changed pitch and went away but heard it again next time I drove it. I'll just have to play around until it's gone.

Thanks for the answer.... it's been driving me nuts!!
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'99 XJ Sport
AirAid Intake
PowerAid Throttle body spacer
RE6030 3.5"
1" T-case drop
31x10.5x15 BFG AT KO's
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djgrayxj
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Joined: 26 Sep 2007
Location: Southern California

PostPosted: Wed Mar 26, 2008 1:47 am    Post subject: Post to tomynoks Reply with quote

Post to tomynoks
You said I was able to get a wrench on the [FORWARD HEAD BOLT] and tightened it a little.
mr.cvis said I put a 15mm socket with 1/2" Drive on the very back top mounting bolt of my [INTAKE MANIFOLD] and tighten and the whistle stopped.
Did you tighten the write bolt?
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mr.civis
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Joined: 20 Mar 2008

PostPosted: Wed Mar 26, 2008 7:57 am    Post subject: Reply with quote

I had about a 6" extension, its not easy but it can be done.

And its the top Back bolt.
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