Quote:
Originally Posted by Speedy Squirrel
Here is the description of the vacuum connections on the '86 to '89 930 throttle body. One of the big differences is that the cold start idle is now controlled entirely by the idle air bypass valve. There is no vacuum from port V to the front side of the distributor until the throttle is opened slightly.
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For the sake of clairity, when you say "front" of the dizzy, do you mean the side that cant be seen facing toward the front of the car? To me, that's the back of the dizzy. Very important distinction to be on the same page.
My hoses might very well be installed reversed...not color coded, all black... and I'm pretty certain the V port on the TB goes to that thermo valve way back by the breather and on to the "back" of the dizzy, not the front. Should have done a better job mapping it out when I had everything off the top of the motor.
If the front (nearest hose facing me) actually does advance, perhaps I should shunt around that solenoid going to the front of the dizzy, since it's permanently closed (no power going to it), and thus gain vacuum advance from part-to-1/3 throttle.