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post #1 of (permalink) Old 06-15-2004, 02:21 PM Thread Starter
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whistle in 4.0 swap

I swapped a 93 4.0 from a XJ into the CJ a while back and put a Rock-it air tube and filter on it. I have a loud whistle during part throttle. It goes away during no throttle or anything past 1/4 throttle. It's just in that one area that you need to hold the gas to maintain speed while driving. I've heard that adding a throttle body spacer would eliminate this whistle, does anyone know this for a fact? And if so, which spacer is the best for the money?
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post #2 of (permalink) Old 06-15-2004, 02:30 PM
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Re: whistle in 4.0 swap

I think the whistle is coming from the air tube setup. I've read that virtually all of the aftermarket low-restriction air intakes make the whistling noise.
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post #3 of (permalink) Old 06-15-2004, 07:13 PM
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Re: whistle in 4.0 swap

Double check your intake/exhaust manifold torques too.
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post #4 of (permalink) Old 06-15-2004, 07:36 PM
 
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Re: whistle in 4.0 swap

Definitely check the torque on the intake manifold. They tend to loosen up over time, at least mine have. I get a loud whistle that will go away after I get off of the freeway. It's doing it again right now, just haven't had time to retorque them. Anyone know if locktite would be a good or bad idea here?
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post #5 of (permalink) Old 06-22-2004, 11:57 PM
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Re: whistle in 4.0 swap

My K&N whistles (92 YJ). Kinda sounds like a jet engine. If you don't like the whistle, turn up the stereo!!!

Mongo [img]images/graemlins/givemebeer.gif[/img]
post #6 of (permalink) Old 06-23-2004, 02:09 AM
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Re: whistle in 4.0 swap

I got the same setup on my wife's 4.0. It whistles when you shift and the throttle transitions from off the pedal to on. Her's is only a brief "toot" (almost sounds like a chirp)

Has anyone ever heard a "sonic welder" used in plastics?? This is the identical sound.
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