Quote:
Can anybody tell me the pressure from exaust into the [back] of the bpt valve?
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Is just exhaust pressure, depends on the engine condition and speed.
With the engine turn "OFF" the air should flow freely through the BPT valve. When the engine is running, as the exhaust pressure increases the BPT valve closes. It is a very simple valve and rarely goes bad.
What is the problem with your Altima?