Just had some questions regarding the A.I.R. system on an '85 LG4 with the stock Q-Jet and manifolds.

First off, I noticed there is not a pulley for the A.I.R. system to be found anywhere on the engine. I see the tubing for the system itself and other associated vacuum lines, but no pulley. My friend said that the carb'ed 305s use the engine vacuum instead of a belt pulley to add air like the later FI models do. Is this correct, or am I just missing something here?

Secondly, after reading through that whole sticky post about the A.I.R. system, you mentioned removing it on TPI system actually leans the A/F ratio out due to system accounting for it by adding 100 mv to the O² readings. I was thinking that rejetting the carb would take care of that problem, but with a computer controlled carb I'm not so sure anymore. Any advice?

Finally, despite the fact that the generally accepted idea around here is to rip out all the emissions equipment if you don't have testing, I don't see the point of adding to the pollution if it doesn't rob any power anyway. That said, if I do decided to rip it all out, is there going to be an increase in the amount of emmissions my car emits? Will running a catalytic convertor designed to work with the A.I.R. system (namely, the Catco 9118 3" cat) become damaged without being hooked up the the A.I.R. system?

I'm sorry for the longwinded questions, I'm just trying to get everything right the first time around. Thanks for your help.

 

Carbed cars used a belt driven pump just like every other application.

 

So basically you're telling me mine is missing?

 

Sounds like it.

 

My 86 LG4 has the pump. It should be on the lower passenger side of your engine. You should at least see the brackets, unless someone made a really clean AIR delete.

 

The pulley for the A.I.R. pump belt is on the water pump only.

I ran mine for 2 years with a Catco 3" universal without A.I.R., then hooked it up for the emissions test that came due. It passed with flying colors.

Although I don't know any details, I don't believe the CC carb adjusts mixture based on A.I.R. It was a later tweak to meet more stingent requirements.

 

Well, that's good to know. As far as I can tell, I can't see any form of an air pump anywhere on the car. I checked up and down to try and find it, but it's no where to be found. I recently replaced my water pump as well, and I think I would have noticed if it is connected to it.

Anyone got a pic of how it is typically installed on an LG4/L69 for reference? Perhaps I'm just blind but I can't find it anywhere. The hoses and stuff are all there, just not the pump itself.