NO, there is no exhaust injected into the intake. The pulse secondary air valve injects air into the exhaust and has nothing whatever to do with how the engine runs, it's only emission control. The IASA valve lets air into the intake on deceleration only, if it wasn't closing it wouldn't idle. They share the same hose from the air box but that's all. If it is running lean it has something to do with the carbs or the air jet controllers. And it will run too lean without the proper air filter, if you have a K&N or something like that throw it away.
Ah! I understand now. So the IASA Valve and the PAIR both use the same inlet tube from the forward right side of the filter box. But they do not operate together, and are independent systems. Oh about the filter, I am using a stock air filter.. I don't believe in K&N filters as to me you lose power (I suppose depending on vehicle application) as opposed to gaining power unless of course you do not add the red oil on the filter elements. I've always stuck with stock filters.
Here is what I noticed today.
1. Engine idle, I pulled a vacuum on the CCU (Carburetor Control Unit) and the engine began idling very rough and choppy. Is this normal? Possibly a bad CCU?
2. Performed vacuum test (own idea and not the book) on both the left and right intake manifolds. Both were somewhat balanced (as though I were syncing them), but I noticed that the left intake had a hell of a lot more oscillation of the needle. Mind you that I was using a standard automotive vacuum gauge. The right vacuum gauge had a tiny bit of bouncing at idle, but the left one was exaggerated, almost acting like a sticking intake valve or something.
Question: If the PAIR were faulty (test to be performed) is it possible that exhaust gases are bleeding into the left intake manifold on the left side only, possible because of a failed reed check valve? Actually now that I think of it, both intake manifolds have their own PAIR hoses. Take off one of the vacuum lines (any line on the left intake manifold) and place your finger over it, and you feel a pulse instead of a strong vacuum. For example, I pulled the test hose from the aft left side of the filter box that is connected to the pair and solenoid, and while at idle, it pulsed with tiny puffs of air. Run the engine up above 2,000 RPM and the hose still pulsed. Have I just found the problem?
The books says to idle the engine with this hose and apply a vacuum, and it should hold and no suction should be felt from the PAIR inlet tube (front right side of the filter box). The vacuum DID NOT hold, although the valve appears to have closed as little to no suction could be felt on the forward right tube of the filter box.
Based on the description, does this sound like a leaking PAIR valve?
THEORY: If my logic is correct, it's possible the PAIR is not closing all of the way and allowing pulsed air back into the system (if that's even possible) and would thus explain why vacuum pressure was not held at the test hose. If a reed check valve fails, wouldn't that allow exhaust gases to backflow towards the PAIR or even the entire left vacuum system? Or am I off base here? Otherwise, the pulsing might just be a sticking intake valve. Sounds like it's about time for the good ole seafoam treatment. Any takers?
Sorry to tap into the plethora of Goldwing knowledge here. I appreciate everyone's inputs. Hmmmmm? The more I think of it, this is starting to look more and more like sticking intake valves and that might explain why only the left intake manifold vibrates the gauges needle more than the right intake manifold.