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The official Bosch bypass thread.
This is the setup I use and it is dead simple and very effective.
Why the bypass?
I have already talked to at least 6 people who have had problems with off idle bucking and surging.
It seems to be most prominant with aftermarket MAF meters.
Without the bypass you could literally here the air stalling in the airfilter box area. Kind of a warbling noise.
I used a Bosch bypass valve P/N 0 280 142 108
that I picked up locally at a parts house.
Other parts needed. two 3/4"pipe to 1" barb fittings.
1' of 1"id radiator hose.
several feet of 3/16" vacuum hose.
This install had the biggest effect on drivability on the Novi1k.
It was like a new car all over again.:)
The setup on my car is without a smog pump so I don't know for sure if my setup would clear the smog plumbing or not.
I would like to get some feedback from some of you with smog to let my know if you think it would clear or not.
If you guys have any other questions feel free to ask.