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I decided to dive into a cleaning of my throttle body this morning and found some interesting symptoms of what I think is the problem with the rear main seal leaking.... That's another post.
I started the car and moved it into position to work on it. When I pulled the throttle body, there was a small amount of fresh oil on the inside of the blade and housing. I cleaned it out, did my t b cleaning, put everything back together again. Car runs great, by the way. The oil inside the t.b. was bothering me, so I did the "jiggle test" to determine whether I had some positive pressure and sure enough, I do. There is positive pressure at idle that slowly turns to vacuum when the engine is revved up a bit. I cleaned the flame trap, which was spotless, checked for vacuum at the small hose at the flame trap and there seems to be plenty, checked for vacuum at the manifold nipple, plenty there too. The separator box is "nearly new" with only 50K on it, and oil changes have been with synthetic oil. To add to my frustration, the water pump is leaking :(. So what's the deal here? Is there supposed to be positive pressure at idle? I don't think so.
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