How to Repair a 1992 Honda Prelude Electronic Air Control Valve

Originally released in 1979, the Prelude went from a shortened Accord to one of the vehicles atop the history of Honda automobiles. The 1992 model year brought the Prelude to a new level. Not only was this prelude sexier and larger than its predecessor, but it also included significant power increases the base 2.2-liter engine produced 140 horsepower and the optional 2.3-liter cranked out 160 horsepower. Both engines use an electronic air control valve to regulate the idle by varying the amount of air that bypasses the throttle plate, straight into the combustion chamber. If this valve is malfunctioning, the Prelude will struggle to hold a steady idle and may not idle at all when the engine is cold.

Instructions

Removal

1

Look on the intake manifold near the rear of the engine and find the electronic air control valve an electrical component with three vacuum hoses plugged into it mounted on top of the intake manifold.

2

Press and hold the unlocking button on the EACVs wiring harness and pull the wiring harness from the EACV.

3

Label each of the three vacuum hoses plugging into the EACV with masking tape and a permanent marker. Pull each of the three vacuum hoses from the EACV.

4

Remove the three bolts securing the EACV to the intake manifold with a ratchet and socket and pull the EACV from the intake manifold. Notice that two O-rings remain attached to the intake manifold-to-EACV ports. Pry these O-rings out with a flat-head screwdriver and discard them.

Installation

5

Set new O-rings included with the new EACV on the intake manifold-to-EACV ports and press them into their grooves to seat them. Position the new EACV over the ports in the intake manifold and guide the EACV onto the intake manifold until the valves in the EACV insert into the ports in the manifold.

6

Hand-tighten the three EACV-retaining bolts, then torque them to 16 foot-pounds with a torque wrench and socket.

7

Connect the vacuum hoses to their respective inputs on the EACV, according to the labels you placed on them. Pull the labels off the vacuum hoses.

8

Plug the wiring harness into the receptacle in the EACV.