OK, its really about TBI's on crossfire, but now that you are here, read on and opine.

As you know, the crossfire has two tbi's which are nothing more than large single bore carbs with an injector in the middle of each. You balance them using a vacuum port on each tbi. The vacuum port is capped with a rubber cover that pulls off. What is happening is the rubber caps are having the very center part sucked in enough to break it open. Like a toothpick or nail was punched in the very end. I can buy aftermarket plugs and the driver side tbi will pull a hole in the end in several months. Vacuum leaks are bad.

A solution I thunk up was to run a hose between each port such that each end of the hose is connected to a port. What does that do to the balancing that is done. Does it hurt it. Does it have no effect. Does it make any difference?

For all its worth, I found that a Presta bicycle tube cap is exactly - or so it seems - the right size. They are hard and I can screw the cap down over the ridge that is there on the port. That's what I have done for now, as I have no more caps at home. Something other than a rubber cap seems to be needed. Some sort of harder, flexible plastic cap is needed. Or something. Though about putting a BB in a longer cap to act as a check valve. May still do that.

 

Goodnight - hoping to receive any response overnight. :sleep:

 

It dont make any difference what you plug it with, just stop the leak.