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Old 09-06-2012, 11:12 AM   #1
616's E46
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Join Date: Jun 2012
Location: Michigan
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My Ride: E46 325i
2001 Saab 9-3 weird noise

car is a Turbo. upon acceleration I'm hearing a high pitch whine.. like power steering, but not. there is a knock that is kinda low, sorta like a rod knock but I don't think it threw one. its normal when the car is at idle. sometimes there is a flushing sound as if pressure is being released somewhere... any ideas what it could be or where to start looking?

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Old 09-06-2012, 11:28 AM   #2
SamDoe1
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Diagnosis: It's a Saab.

In all seriousness, it sounds like it's not holding boost very well if at all. If it had thrown a rod, it wouldn't be running at all. My guess is a problem with the turbo system, whether it be bearings, bypass valve, pressure sensors, etc I don't know.

Knock might be lifter tick? Does it increase and slow down with RPM range? Check the oil level either way, if it is low on oil it definitely could have damaged the turbo.

Last edited by SamDoe1; 09-06-2012 at 11:46 AM.
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Old 09-06-2012, 11:34 AM   #3
customisbetter
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Sounds like a turbo is a bad bearing.
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Old 09-06-2012, 11:35 AM   #4
v8 5
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What happens when you switch highways at wot
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Old 09-06-2012, 12:38 PM   #5
616's E46
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Quote:
Originally Posted by v8 5 View Post
What happens when you switch highways at wot
when I switch highways at what??

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Old 09-06-2012, 12:41 PM   #6
Bemwe_03i
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My Ride: 2003.5 E46 M3 smg IR
lackbof turbos

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