The Toyota Landcruiser Owners Club

[apc]

This issue has been bugging me for over 2 years now and continues even after a complete professional turbo rebuild/recondition and visual inspections by mechanics.

During colder weather especially as we approach winter the turbo is extremely loud when it hits turbo boost, so loud in fact that people walking along a street stop to see where the noise is coming from. Putting my foot down the noise is so loud that I am reluctant to do it at all. The noise is difficult to describe but is sort of a loud hissing, rasping noise that is definitely not mechanical.

Here is the really strange thing however - as the ambient air temperature outside gets warmer and warmer the turbo becomes quieter and quieter until when the air temperature outside reaches 74 degrees in the Summer it is almost completely silent as it should be. As we approach Winter and air temperature falls it is becoming extremely loud.

I can only surmise that there is a small hole somewhere that expands as the air temperature increases, thus sealing the leak. Engine temperature has no effect.

All comments, suggestions most welcome.

Thanks.
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1998 100 Series Land Cruiser Amazon VX 4.2 TD. Original owner.

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[Redmog]

Mine did something similar. I tried all sorts, turned out to be loose inlet manifold bolts. 30 minute fix.