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NoDOHC · 12-11-2009, 12:03 AM

The auxiliary ports are actuated entirely by exhaust backpressure. This means that a higher flowing exhaust will not allow them to open at all due to lower backpressure.

They are slightly adjustable, but not very much so. I saw a guy bypass his ACV and using an orifice in the outlet of the airpump, actuate the ports using that technique. The simplest trick is to install a 12V air pump and an RPM switch and use one of the stock air solenoids from the rats nest.

From what you are describing, the ports are open at all times, as you said that unplugging the line makes them open. Unplugging the line should make them shut. You make have an exhaust plug (like melted cats) that is making backpressure at very low revs.

12-11-2009, 12:03 AM	#4
NoDOHC The quest for more torque Join Date: Sep 2008 Location: Sheboygan, Wisconsin Posts: 855 Rep Power: 17	The auxiliary ports are actuated entirely by exhaust backpressure. This means that a higher flowing exhaust will not allow them to open at all due to lower backpressure. They are slightly adjustable, but not very much so. I saw a guy bypass his ACV and using an orifice in the outlet of the airpump, actuate the ports using that technique. The simplest trick is to install a 12V air pump and an RPM switch and use one of the stock air solenoids from the rats nest. From what you are describing, the ports are open at all times, as you said that unplugging the line makes them open. Unplugging the line should make them shut. You make have an exhaust plug (like melted cats) that is making backpressure at very low revs. __________________ 1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers) 1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)