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Hello, can you let me know what you are working on please?
2006 f350 super duty 6.0l powerstroke diesel
Are you testing the high pressure oil system using special tool303-765? When you don't have a visible leak do you mean outside of the engine?
yes and yes
Thank you. When testing for high pressure oil leak. This is an internal leak inside the engine. You want to listen under the valve covers and under the turbo for noise.
right, there was no noise no leak.
Ok are you performing the test on a hot engine? Does the vehicle not run at all or does it not restart once it's hot?
no start only crank
If you don't hear an air leak you probably have a bad IPR valve that regulates high pressure oil.
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Hello, were you able to fix the concern?