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Unread 06-08-2014, 12:57 AM   #1
SLO_Ken
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Squeal / Tea Kettle Whistle... I'm at my Wits' End!!

So I've got a 4.0 out of a '98 XJ in my CJ. For the past couple months, I've been getting a very loud, very high-pitched squeal at part throttle. It only happens when the engine has a load on it, and only between ~1800 and 2500 rpm.

First I thought it might be a bearing going out. I pulled the belt off and took a quick spin around the block. No change. But I can conclusively say it's not the alternator, power steering and water pumps, or either idler pulley.

I tried spraying around the intake with carb cleaner to see if there were any leaks. I did find a leaky throttle shaft seal, which I replaced. Also put on a new throttle body gasket while I was there... No change.

I pulled all the vacuum hoses off the manifold, one at a time, then capped the port and went around the block. No change.

I checked all the manifold bolts. They were all tight. I replaced the gasket with a Felpro. Still, no change.

What am I missing?!? This is getting ridiculous! I'm embarrassed to drive through town with this thing squealing so loud.

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Unread 06-08-2014, 01:40 AM   #2
SouthSeaPirate
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Have you tried it with the belt off? I don't mean just checking pulleys, I mean replicating the instance underload without the belt on. Just to 100% confirm it is not a pulley.
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Unread 06-08-2014, 06:20 AM   #3
skyway0018746
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Could be in your throttle body , do you have a bigger one installed ?
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Unread 06-08-2014, 09:46 AM   #4
CJ7-Tim
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The most likely source of the whistle is the throttle body. Remove the TB, remove the Idle Air Controller (IAC), and radius all the edges for the IAC upper and lower ports in the throttle body bore.
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Unread 06-08-2014, 11:56 AM   #5
SLO_Ken
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Quote:
Originally Posted by SouthSeaPirate View Post
Have you tried it with the belt off? I don't mean just checking pulleys, I mean replicating the instance underload without the belt on. Just to 100% confirm it is not a pulley.
Yep, that's the first thing I tried. I took the belt off and drove around the block.

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Originally Posted by skyway0018746 View Post
Could be in your throttle body , do you have a bigger one installed ?
Nope, just the stock TB.

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Originally Posted by CJ7-Tim View Post
The most likely source of the whistle is the throttle body. Remove the TB, remove the Idle Air Controller (IAC), and radius all the edges for the IAC upper and lower ports in the throttle body bore.
Thanks, I'll try that sometime this week.
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Unread 06-09-2014, 10:55 PM   #6
SLO_Ken
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Quote:
Originally Posted by CJ7-Tim View Post
The most likely source of the whistle is the throttle body. Remove the TB, remove the Idle Air Controller (IAC), and radius all the edges for the IAC upper and lower ports in the throttle body bore.
How much of a radius do you suggest? I filed down all the casting flash inside the IAC body and broke the sharp edges on the TB, but I'm still getting the same noise.

I replaced the injector O-rings, just because that's the only place I can think of where there could possibly be a vacuum leak. That didn't make a difference...
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Unread 06-10-2014, 07:35 AM   #7
skyway0018746
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Shouldn't have to go too crazy , did you radius the butterfly too ? Just enough not to cause turbulence. Is there still a gasket under the throttle body ?
And you checked all vacuum hoses ?
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Unread 06-10-2014, 10:11 AM   #8
SLO_Ken
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I did not radius the butterfly.

There is still a gasket under the TB

Yes, I checked all the hoses. I pulled one hose at a time from the manifold, plugged the port on the manifold, then went for a test drive. If the noise was still present, I knew it wasn't that hose. Then I reconnected the hose and repeated the process for every hose connected to the manifold. None of them made a difference...
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Unread 06-10-2014, 10:32 AM   #9
skyway0018746
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Mine starts to whistle at 1500 rpm but its not enough to make me fix it. Maybe swap out the tb for one that's known not to whistle. Does it change tune when you move the pedal ? Do you have a manual or standard trans behind the motor ? Throw out bearing or related parts could be making the noise. Maybe a sound clip or video could help, hard to do but could try a stethoscope to pin point.
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62 mm bored throttle body's fs - pm
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Unread 06-10-2014, 11:24 AM   #10
brute66
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I had whistling coming from the distributor. Worn bearings can lead to plastic parts touching inside as they spin...creates a howling noise.
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Unread 06-10-2014, 12:29 PM   #11
wilson884
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How's the harmonic balancer pulley? Those bearings can do that noise
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Unread 06-10-2014, 12:41 PM   #12
SLO_Ken
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Quote:
Originally Posted by skyway0018746 View Post
Mine starts to whistle at 1500 rpm but its not enough to make me fix it. Maybe swap out the tb for one that's known not to whistle. Does it change tune when you move the pedal ? Do you have a manual or standard trans behind the motor ? Throw out bearing or related parts could be making the noise. Maybe a sound clip or video could help, hard to do but could try a stethoscope to pin point.
Mine's LOUD! As in "I'm embarrassed to drive it in town" loud. Swapping out the TB was my next troubleshooting step.

It's a manual transmission. I did think it may be the throwout bearing or even possibly the transmission input shaft bearing, but I wanted to eliminate other possibilities before pulling the transmission.

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Originally Posted by wilson884 View Post
How's the harmonic balancer pulley? Those bearings can do that noise
I though about that too. Again, I wanted to eliminate all other possibilities before pulling the radiator/grill to get at the crank pulley.
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Unread 06-10-2014, 01:34 PM   #13
skyway0018746
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Quote:
Originally Posted by wilson884 View Post
How's the harmonic balancer pulley? Those bearings can do that noise
There are no bearing in or on the balancer .... just the crank shaft bearing if that's making the noise you have worse problems .

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Originally Posted by SLO_Ken View Post

Mine's LOUD! As in "I'm embarrassed to drive it in town" loud.
mine is more like a turbo whistle / whine . Yours sounds more serious sounds more like a bearing . Similar to the famous 4.0 belt slipping squeal? ( obviously its not the belt )
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62 mm bored throttle body's fs - pm
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Unread 06-10-2014, 08:43 PM   #14
ECL
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Try to isolate where the noise is coming from. Front, back, top or bottom of engine. Use the old trick of a long screwdriver or a socket wrench extension(hold one end against your ear and the other against various parts of the engine). Rev the engine as you're listening to duplicate the noise. Once you nail down the "where", it will be easier to nail down the "what".
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Unread 06-10-2014, 10:35 PM   #15
SLO_Ken
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Quote:
Originally Posted by ECL View Post
Try to isolate where the noise is coming from. Front, back, top or bottom of engine. Use the old trick of a long screwdriver or a socket wrench extension(hold one end against your ear and the other against various parts of the engine). Rev the engine as you're listening to duplicate the noise. Once you nail down the "where", it will be easier to nail down the "what".
Unfortunately, it only makes the noise when the engine has a load on it, so revving it in the driveway does not help...
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