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Thread: Engine noise or supercharger noise?

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    Engine noise or supercharger noise?

    What are signs from a engine messing up? My Harley runs good and has power but when its in park, there is noise coming from under the hood and I'm scared out of my mind don't know if it's from engine or supercharger it's a rattling sound?

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    Any noise coming from under the hood that is described as a rattling sound is not good. Does it only happen while its parked? does the noise become more prominent when you give it throttle?

    It could be anything from an exhaust leak, to detonation, to a spark plug about to pop.

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    Idler pulleys??/

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    I only hear it when it's parked and I just now looked under the hood and got close to supercharger and sounds like it's from there but then again I'm not 100% sure.

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    Parked in neutral? noise still there? Try the stephascope(sp) trick with a screwdriver with handle to the ear and listen to locate the sound.

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    On the right side of the supercharger there is a Black canister with a pink and a black vaccum line hooked up to it. this is the boost accuator. When you start your truck you should see the plunger pull up a lever on the supercharger. When you give it gas the plunger should drop. If you start your truck and the plunger does not lift take your fingers and pull up on the lever....this should make the sound stop...if it doe s you have a bad boost accuator...I have one in my garage if you need one...for a good laugh call Ford they want almost $300

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