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Old 03-27-2023, 01:42 PM #1
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Idle whistle
Would like some opinions on this whistle that started recently. I have no check engine lights and pull good vacuum, no other symptoms.

2000 4Runner
Supercharger has been on for over 3 years with no issues.
Whistle ONLY occurs after warmed up

I have no vacuum leaks that are apparent, I am suspecting the idle air bypass at this point...what do you think?

Garage whistle.MOV - VEED

vacuum.MOV - VEED-
truck is in drive in this video

Idle whistle.MOV - VEED
Last edited by atcpup; 03-27-2023 at 02:46 PM.
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Old 03-27-2023, 04:17 PM #2
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Mostly, whistles are vacuum leaks. I just get a can of WD-40 when the engine warms up and spray it around (keeping away from the exhaust) and see if you can pinpoint the location. I expect the whistle to stop and the engine to change rpm if you hit the vacuum leak. If there is a leak, that should help you find it.

I wouldn't use anything super flammable though like starting fluid.

Brake cleaner would probably work as well as WD-40
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Old 03-28-2023, 08:18 AM #3
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Quote:
Originally Posted by brillo_76 View Post
Mostly, whistles are vacuum leaks. I just get a can of WD-40 when the engine warms up and spray it around (keeping away from the exhaust) and see if you can pinpoint the location. I expect the whistle to stop and the engine to change rpm if you hit the vacuum leak. If there is a leak, that should help you find it.

I wouldn't use anything super flammable though like starting fluid.

Brake cleaner would probably work as well as WD-40
I appreciate the advice but I sprayed brake cleaner all over and the whistle never went away. I really don't think it's a vacuum leak.

There is however a check valve that was installed with the supercharger (per instructions) and now I'm curious if it's that. I'll dig in today as that valve is not too easy to get to.
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Old 03-28-2023, 08:41 AM #4
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That happens, at least it's ruled out... Check valves are another possibility. Is it a whistle and not a bearing whine?

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