Introduction
This install guide does not show all steps for installing this throttle body into a vehicle as it is compatible with many applications. However, this guide addresses many of the key features you should be familiar with when installing your new throttle body.
DO NOT REMOVE the graphite colored paint on the rim of the butterfly. This paint is used to seal the throttle body from a vacuum leak. If there is a small amount of flaking, still do not remove it. If it comes off and goes into the engine it will not hurt the engine since the paint is carbon based and will be consumed by the engine.
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If you intend to bore the manifold yourself, use the supplied plastic gasket to trace out the bore before removing the studs.
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Remove the gasket and check to see that the traced circle as shown in the figure.
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The studs can be removed. The studs should be removed by threading two nuts onto the stud binding them together. Unscrew the inner nut to unthread the stud.
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If you’re boring your own manifold, a die grinder or high-speed drill can be used with a grinding stone or sanding drum to bore the manifold from its 63mm stock size up to the outside edge of the circle you traced in step 1.
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Next, flush out the remaining dust. Allowing water to flow through the manifold for a while will help to carry out debris that may not have been removed earlier. Make sure the manifold has thoroughly dried before installing it back on your motor.
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If you are not using the idle air control valve (IACV) you can use the supplied 1/8th NPT plugs to block off the essential air ports.
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You must install and tighten the plugs in the lower IACV section, as well as the two on the mounting face of the throttle body.
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Place the OE IACV gasket into the machined groove on the bottom side of the throttle body. Next, place the IACV on the gasket aligning the two mounting holes.
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Use the two supplied bolts and secure the IACV to the housing.
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The port circled in RED is for the Purge Control Solenoid Valve. This is an emissions sensor used on the Acura RSX chassis. Insert a plug & retaining ring into this port if you are not using this sensor.
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The port circled in ORANGE is for the MAP sensor. Install the MAP sensor into this port if you are using the PRB/PRC style intake manifold.
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Using the supplied thermal gasket and stainless mounting hardware, attach your HR throttle body to your intake manifold of choice. (RBC shown)
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There are two mounting bolts on the top and two on the bottom. (Bottom not shown)
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If you are using the RBC intake manifold, install the MAP sensor in the OE location. (Shown with arrow)
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Begin by threading one of mounting nuts and rubber boot down towards the end of the cable. Insert the throttle cable through the bracket groove.
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Insert the cable end into the throttle body rotor.
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Insert the cable into the throttle body rotor groove so the cable is in line with the mounting bracket.
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Thread the backing nut towards the bracket and adjust the cable placement so that the butterfly is fully open when the pedal is depressed to its maximum.
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Tighten the throttle cable nuts together holding it to the throttle body bracket.
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Loosen the locking nut on the throttle plate stop screw. These parts have thread lock on them.
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Thread the throttle plate stop screw inward, to open the throttle plate. Once your desired idle has been achieved, apply thread lock and fully tighten the nut. Note that very SMALL adjustments can affect the idle in large ways.
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The graphite coating is in place to prevent unwanted from air passing around the throttle plate. Removing this can cause idle issues.
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