Hey guys,

99 S70 T5, When I accelerate and let off right away, I get a whistling noise coming from either the exhaust or the engine.I can't figure it out. It only does it in drive not in park or nutruel. Any ideas?

 

That should be the bypass valve on the turbo releasing pressure which is normal.

 

I never heard that comeout of any other turbo cars. I could be the bearing inside the turbo. Its hard to get to where the bearing is to check it. Or like you said tech, if that is the case the valve is on its way out.

 

No that is normal.
I am suprised you have never heard it before.
It is the factory setup like a blow off valve.

 

I believe you but it didnt start doing that until around 179,000 miles. I purchased it at 50,000. (?) It was quite up until that high of mileage.

 

My R with 88,000 miles does it.
My turbo with 190,000 miles does it.

Maybe you also have a turbo hose going bad making the noise louder than it normally would be.

 

That may be the problem. Good suggestion. I'll check it out. Has your fuel pump gone out yet?

 

I have only had the white turbo for about 6 or 7 months no problems with the fuel pump.

The yellow one only had about 2 months. Both pumps look like they have been there a while.

 

Mine went out as far as I know. Wont be sure until 2moro tho. Its coming in finally. I believe its the original. The car has 224,000 miles on it. Do you know where I can find a cam locking tool?

 

Maybe e-bay.

The tool comapny's want way to much $$$$ for the Volvo tool.

 

Check the intercooler hoses for cracks. If there's a crack or hole, the boost will whistle as it's forced out the small holes/cracks.

Also, at that mileage, I'm betting that the diaphram in your compressor's bypass valve is all but disentegrated. Buy a repair kit here.

http://quickbrickmotorsports.com/prod_cbvupgrade.html