Vacuum "Spiders", Shutter Valve, Air Control Valves, Block-off Plates

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81-85 12A "Shutter Valve"
The valve is attached to the intake manifold on the engine side, at the rear, under the carb, with a medium hose going to the air filter, and a small hose going to the metal vac hose rail, and is part of the smog equipment. It is a very common problem that can drive you, or unknowing mechanics nuts. The symptom is a weird "honking" noise at idle, or as the engine is returning to idle. When they are really bad, the idle is very rough. The carb has to be removed, or at least unbolted, and lifted up a few inches, to get to it. If the shaft it hooks to is badly worn, it should also be replaced, but the manifold has to be removed to do it.
	Valve	13-130A-1480	We have written a Replacing the Shutter Valve section in our FAQ/How-to Area that you might want to view.
	Gasket	13-139C-1480
	Shaft	13-120A-1480

86-88 "Vacuum Hose Spider"
Most of the 86-88 cars we have had the intake manifold off of needed most, or all, of the little vacuum hoses for the oil metering valves. On a few of them, those hoses were the entire poor idling problem. We just get all the hoses (5) and the black plastic "splitter" block, and sell them as a "kit". The turbo cars are much more prone to this problem due to the temperatures the turbo itself generates.
	86-88 (non turbo)	14-VACSPIDER-NT
	86-88 (Turbo)	14-VACSPIDER-TB

	Anti-Afterburn Valve to Intake Manifold Hose (81-85 12A)
Many customers have spent many hundreds of dollars on wrong diagnosis/unnecessary repairs at other shops because of this hose. Due to it's close proximity to the exhaust manifold, the hose tends to get soft and split. It goes from the back of the carb down to a tube sticking out of the back side of the intake manifold.
Part Number	13-7560-N201

Air Control Valves
Large back-fire on deceleration and/or between shifts usually means this valve is no good especially on 79 & 80 RX7's. Also, if the car will not pass an emissions test, this is the culprit 90% of the time. If your O2 reading is less than .5% and HC and/or CO is high, this is your problem.
The table below is NOT a complete listing. If you do not see your exact one listed, or are unsure, please call as they are different depending on Manual vs. Automatic, Calif. vs Federal, etc. and VIN dependent.
79-92   (93-95 Manaul Only)	Part Number	Year(s)	Engine	Fits
	13-720-8871	79-80	12A	No Longer Available
	13-7200-N203	81-82	12A	All NOT California emissions
	13-7200-N231	83	12A	All NOT California emissions
	13-7200-N201	81-83	12A	All California
	13-720B-N251	84-85	12A	No Longer Available
	13-720B-N304	84-85	13B	All GSLSE
	13-9900-N326	86-88	13B	Non-Turbo Manual Trans
	13-9900-N327	86-88	13B	Non-Turbo Automatic
	13-9900-N332	87-88	13B	Turbo only
	13-990A-N350	89-92	13B	Non-turbo
	13-990A-N370	89-92	13B	Turbo Only
	13-9900-N3A4	93-95	13B	Automatic Only
	13-9900-N3A3	93-95	13B	Manual Only
Air Control Valve Gasket	13-724A-N201	81-92 NT	All Non-Turbo
	13-9960-N386	86-92 Turbo	All Turbo
	13-9960-N3A3	93-95 TT	All Twin Turbo

Air Control Check Valve
	All Years, All Engines	13-7300-1480

Vaccum Hose Orifice
	.5mm	13-9860-8931

Air Control Block-Off Plate
	74-75 Intake Manifold	16326
	79-80 Intake Manifold	16321
	Non Turbo Intake Manifold	16325
	Turbo Intake Manifold	16328MZ

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