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Anyone out there? Question about a vibration on 2000 Boxster base model 5-speed

marvkaye
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marvkaye Member

marvkaye

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Just trying to find an active forum to discuss my 986...  It's got just over 116,00 miles on it and I'm trying to take care of all the issues.  One concern is an emgine-speed related rumble, comes on about 2200-2300 rpms, gets about as bad as it gets around 3000, quiets down / goes away at higher rpms.  I'm thinking engine mount / trans mounts replacement might help... I'm assuming the failed rubber is allowing things to resonate in that rpm range.  Anyone out there dealt with something similar, or have an opinion on my mounts assumption? Any suggestions would be appreciated.  Thanks.... MK

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JFP in PA Member

JFP in PA

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Welcome to RennTech :welcomeani:

I would start by looking at the front engine mount beneath the water pump. I would also consider temporarily removing the serpentine belt and then start the engine to see if it goes away as it could be one of the belt driven components or the idler assembly.

marvkaye Member

marvkaye

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Hey JFP... thanks for the welcome and great suggestion... I never considered the belt-driven components.  Just a bit concerned about pulling the belt for testing... would like to drive it, run it through the gears, as that's when it presents itself... without the water pump that would be a quick test drive.

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JFP in PA Member

JFP in PA

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We have seen quite a few complaints of engine speed related noises being tracked down to bearings going bad in tensioner rollers, water pumps, alternators, etc.  I would start by removing the belt and trying to rotate the various components by hand, which often identifies the problem unit without even starting the engine.  Everything should turn smooth and quietly; anything that doesn't should be suspect.

marvkaye Member

marvkaye

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Yeah, makes sense. thanks.  I just figured out how to move the hard storage box to access the carpet... hopefully, later today I'll be able to at least get iin there, take a look. 

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