1988-1991 Honda Civic Cold Air Intake System Installation

Download Note : For 1988-1991 HONDA Civic L4-1.6L and 1988-1991 HONDA CRX L4-1.6L. The AEM® intake system is a performance product that can be used safely during mild weather conditions. During harsh and inclement weather conditions, you must return your vehicle to stock OEM air box and intake tract configuration. Failure to follow these instructions will void your warranty.

Preparing Vehicle
1. Make sure vehicle is parked on level surface.
2. Set parking brake.
3. If engine has run in the past two hours, let it cool down.
4. Disconnect negative battery terminal. e. Do not discard stock components after removal of the factory system.
Removal of stock system
5. Remove the stock air box assembly and attaching hardware from inside the fender well.
6. Disconnect the breather hose from the air inlet tube.
7. CAUTION: Ensure the engine is completely cool before removing the coolant hose, or hot coolant will escape from the cooling system and cause injury or damage. Be sure to capture any lost coolant in a clean container. Disconnect the water bypass hose from throttle body or the fast idle thermo valve, where equipped, located at the lower portion of the throttle body. Disconnect the opposite side of the water bypass hose, which runs to either the intake manifold or the water outlet neck. Remove the entire water bypass hose and breather hose assembly from the vehicle.
8. Loosen and remove the air inlet tube from the throttle body.
9. Raise the front of the vehicle with a jack. Refer to your owner’s manual for proper jack and jack stand placement to properly support vehicle. Support your vehicle using properly rated jack stands before wheel removal or while working under the vehicle. NEVER WORK UNDER A VEHICLE WITHOUT USING JACK STANDS. i. Remove the lower front splashguard. ii. Remove the front right wheel and remove the inner fender liner.
10. Remove the resonator from underneath the vehicle.
Installation of AEM® intake system.
11. When installing the intake system, do not completely tighten the hose clamps or mounting hardware until instructed to do so.
12. Install one connector hose on the throttle body end of the inlet tube. That is the end closest to the breather nipple. Install two hose clamps on the connector hose and snug them down on the hose.
13. Attach the tube to the throttle body while slowly turning or twisting the tube so that it does not touch any surrounding component along its path. i. If required, tighten the hose clamps slightly so that you can still rotate the tube during the remainder of the installation but will also prevent the tube from falling off.
14. Insert this pipe through the hole left exposed by the removal of the resonator.
15. Install the AEM® air filter onto the end of the inlet tube. Push the air filter on around 2 inches over the inlet pipe and install one hose clamp to secure the air filter onto the inlet pipe. Once fitment is checked, you can either push the air filter onto the inlet pipe more or less depending on clearances. Tighten the hose clamp after this is done
16. Check the placement of the air inlet tube for proper alignment. Make sure that the tube does not contact any component along its route nor should it interfere with the function of any other accessory. i. Tighten the hose clamps on the throttle body.
17. The support tab on the inlet pipe will line up with a threaded hole on the inner fender well. Install the rubber isolator mount and attach the air inlet tube onto the rubber mount. Install the large fender washer and the lock nut onto the isolator mount stud and snug it down.
18. Connect the breather hose to the inlet tube using the black breather hose and supplied hose clamps.
19. Connect the new supplied water bypass hose and clamps to the throttle body or the fast idle thermo valve, where equipped, and either the intake manifold or the water outlet neck disconnected earlier.