Whistling noise
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Seasoned Member
Joined: Jan 2012
Posts: 391
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From: Chicago Illinois
Year: 1998
Model: Cherokee
Engine: 4.0L
Generally (not always) vacuum-related leaks which cause a whistling are more pronounced at closed throttle when the engine is making the most vacuum. There is a fairly common "tea kettle" whistle that many get from intake manifold leaks, but again, it usually shows up at idle. In my case, it showed up precisely at the moment I pulled up to the drive-thru window at McDonald's to order lunch. Loud as hell and quite embarrassing.
That being said, it's almost surely vacuum related, even if it's not at idle. XJ's make a symphony of various noises. Squeaking, rumbling, grinding, flapping, ticking, etc. But whistling is almost always vacuum related.
That being said, it's almost surely vacuum related, even if it's not at idle. XJ's make a symphony of various noises. Squeaking, rumbling, grinding, flapping, ticking, etc. But whistling is almost always vacuum related.
Thread Starter
Seasoned Member
Joined: Jan 2012
Posts: 391
Likes: 0
From: Chicago Illinois
Year: 1998
Model: Cherokee
Engine: 4.0L
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