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Turbo Noise When Cold

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98mitsubishigst

10+ Year Contributor
1,526
16
Nov 17, 2008
Pittsburgh, Pennsylvania
Well it use to just make this noise when i turned car on after sitting outside in school parking lot or any parking lot and when it warmed up it would go away


i can here the turbo spool up and the wooshing the injen air intake
but there is also this.. not grinding .. idn its not a normal noise.

You cant hear the noise until 2.5k rpms and thats when the turbo spools up..
and the higher you get in rpms or the faster you go the louder the noise gets and faster the pitch gets...


Let me know what you think
this noise is annoyingg
 
whats our oil pressure? did you check to see if there is any shaft play on the turbine? sounds like the bearings are shot on the turbo, if you can take it off and check for any problems.
 
Is it a squealing or a whining noise? Could be the compressor wheel rubbing on something to a tiny boost leak making a "stretching the mouth of a balloon full of air" type of noise
 
It could be really bad shaft play letting the fins rub on the housings.

Also, a few years ago i had an old 14b on my car and there was a hair line crack in the turbine housing that was there when it was cold but would close when the housing would heat up and expand. It made a whistly/whiney noise until the car warmed up.
 
best bet is to remove the turbo and do an inspection and yes shaft play can cause different types of noises to come from the turbo when spooling.
 
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