Sounds like there is a boost leak. I built my own boost leak tester using some ABS plumbing parts. I installed a valve stem into my ABS plug. You put the plug into the boot coming off of the turbo and then energize it with regulated air...then start listening for air leaks. You can spray some soapy water on the places you think that it may be leaking. Tighten or replace clamps, bolts and gaskets till you have no leaks.
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strange turbo whistle from drivers side
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I use a regulator and start testing around 20 psi and then go up from there. I go about 20% higher than the highest boost pressure that the truck will see. This should keep the couplers from leaking if there were any boost spikes. I was surprised to find more than one leak on my 08 truck...I upgraded the couplers and all the clamps and it worked perfect afterwards.
Here is a picture of the plug I made.
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Some of my buddies made a test plug that fits on the intake of the turbo. When you remove the the stock air intake you can see it. It might be easier to test going through the turbo.
Hair spray can help to seal the couplers to the pipes and also make them stay on under high boost.
Good luck!
Here is a picture of the plug I made.
Some of my buddies made a test plug that fits on the intake of the turbo. When you remove the the stock air intake you can see it. It might be easier to test going through the turbo.
Hair spray can help to seal the couplers to the pipes and also make them stay on under high boost.
Good luck!
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