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I came across some info saying the air/oil separator is a common problem and could cause smoke in the exhaust. So I rented a coolant system pressure tester today and tried a few things.
First test, cold. Pressurized the tank to 13-14psi, after a few min it dropped to 11-12 psi and held that for 10 + minutes.
I pulled the hoses from the air/oil separator, capped the hose to the intake and fired it up. Less smoke at first, but it still smoked and when I would rev it the smoke got much worse like before.
I connected the hoses for the separator and fired it back up. It continued to smoke. I pulled the oil fill cap, and it clearly had vacuum against it because it took effort to remove. After it was off the car stumbled and stalled. Fired it back up and pulled the cap again, I could put my hand on the tube before it would stall to keep it running.
Pulled the seperator hose, plugged the line and fired it up again. I let it idle untill it got to operating temp, and it stayed there (175-180 deg). I pulled the cap and pressure tested the coolant system again with identical results.
The V bands before the mufflers clearly have some oil soakage. With it idling and the engine cover off, smokes was coming up from the compartment.
I ordered a new seperator, and I plan to do a compression/leak down test. I just wonder if the catalytic converters and mufflers are oil soaked causing this to continue. I’ll include some pictures of my finger tips after wiping the exhaust tips.
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