Honda and Acura 68mm Throttle Body
Removal of Engine Accessories
1. Remove the hose clamp that holds the intake tube to the throttle body.
2. Remove the intake tube.
3. Check and measure the throttle position sensor voltage with a volt/ohm meter prior to removal. Record your voltage measurements. Disconnect the TPS.
4. Remove the throttle body mounting nuts.
5. Disconnect the negative battery cable.
6. Remove TPS mounting screws. These are tamperproof screws and will need to be ground off before removal is possible. New screws are provided in the kit for reassembly.
7. Remove the engine fast idle valve mounting screws. Retain the O-rings.
8. Remove manifold absolute pressure (MAP) sensor. Retain the O-rings.
9. Remove throttle linkage cable and bracket.
Porting of Intake Manifold (optional for optimum performance)
WARNING: We suggest removing the manifold before porting the intake manifold. Make sure that the intake manifold is free from chips or debris before reinstalling it. Engine damage will occur if any debris remains in the intake manifold.
1. Use the new throttle body-mounting gasket (supplied) to scribe the porting outline on the intake manifold. See Figure 1.
2. With a sharp scribe tool, trace the inside of the gasket against the intake manifold.
3. Remove the gasket.
4. Use die grinder, or other similar tools, to remove the material from the intake manifold. See Figure 2.
NOTE: For the 68mm throttle body, (if the manifold is port matched or a vacuum leak from the EACV occurs) the manifold passages for the engine air control valve (EACV) must be welded or epoxied and drilled using the gaskets provided as a template. The gasket surface must be milled flat prior to installation. This practice is not required if an aftermarket manifold is purchased or if the EACV is going to be disabled.
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