The car run's rather well, the only problem I have is a high "cold" idle. The only emission item I am questioning is the ABV right now, the PCV, EGR and AIS system are functioning properly.

In the past I have had several carbed cars with out an AVB valve and never worried about an engine fire. Also, the Weber replacement does not use an ABV.
This made me wonder if I needed mine at all, and what it actually did for it. I noticed a lot of possibilities of vacuum leaks with the ABV. If I decide to keep it I will buy a new one and install new hoses.

I am triing to retain as close to stock vehicle as possible. I may just disconnect it for now untill I replace it with a new one.


I will let you know how it performs with out it.

Fast idle (cold) spec is something like 2000 RPM. I always set mine a bit lower because that's loud. But no worries either way.

The anti-backfire valve is part of the A.I.S. Other A14s without AIS or Air Pump doesn't have an AVB.

On the factory tach, please send me a pm for price.

Ignore my stupity but... to remove the A.B.V. I also have to remove the A.I.S.? If this is all done will it effect anything, other than a 33 year old emission system that I doubt makes a difference anyway?

The question is: do you want a backfire. I would leave it connected as it doesn't hurt performance.

The emission system makes a difference. Mine is a 1972 and still in working condition. Why do you thinks your doesn't make a difference? Are some of the parts broken?

The one that robs the most performance is the EGR and the spark timing cutouts. Look through your 1977 factory service manual (I got mine for $5 off ebay) and it will explain how each system works.

Sounds like good advice. I will leave it all connected. Some of the pre=shaped hoses have cracked, but I am sure I can figure that out. I will leave it fully stock.