Quote:
Originally Posted by crobinson
I guess there could be a bunch of things that could do this that are DME control related. One simple thing I would mention is to look at the oil filler cap seal. My 87 Targa 3.2 was having idle problems until I changed the cap. I hope there is someone that understands that, I don't! Why do you need pressure in the sump to maintain smooth idle. If I remove the cap, it will die or almost die. Sorry to ask another question.
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The oil tank is under vacuum from the intake. This is to help purge oil vapour. Opening the oil cap, or a leaky gasket under it, allows unmetered air to enter the intake, aka: a vacuum leak.
The routing of the crankcase ventilation is quite circuitous: a vacuum hose runs to the oil tank, another hose runs from the oil tank to the crankcase breather, yet another runs from the oil tank to the back of the throttle body above the throttle plate. There are more supplementary hoses as well.
That is also why, if you overfill your oil tank, you can get massive oil smoke from your engine. Oil can spill up one of these hoses into your intake.