Wife's 91 Accord has been having an issue once in a while when idling that it revs up and down continually?!? It's happening more and more. Is there something specific that I can check to see it needs?
THANKS!
Newbie Richard

 

Welcome in,it could be one of several problems,I would first check the coolant system,if there is air in the system it will idle up and down. If that doesn't fix it, it maybe a vacuum leak,start hunting. Sometimes an aerosol can of carb cleaner sprayed in the suspect area will help you pinpoint it. A pair of needle nose pliers helps in clamping off suspect hoses, try the brake booster.If that fails the Idle air control is dirty and needs to be cleaned.Good luck

 

Will check those out tomorrow, thanks!
Any hint of where the idle air control is located too?
Richard

 

The Honda idle air control valve is always at the rear of the intake manifold. The intake manifold is in the rear of the engine bay on front-wheel drive models .

Here is how to clean it:

1 Disconnect the cable running to the negative battery terminal. Loosen the nut on the cable clamp attached to the negative terminal, and lift the clamp off the terminal.

2 Open the hood and remove the two screws that hold the idle control valve to the throttle body. The throttle body and the valve are located on the back side of the engine near the firewall. Be careful when removing the screws; it's easy to strip them. Honda uses soft head screws for the IAC valve. You must put your entire body weight on the screw head and turn it slowly to be sure you don't ruin the head of the screw.

3 Remove the electrical plug running to the IAC valve. Squeeze the top and bottom of the plug to remove it.

4 Pull the idle control valve off the throttle body, and turn it over to expose the valve openings.

5 There are two holes on the underside of the valve. In one of the holes, you should see a sensor. It will probably be covered in dust or dirt.

6 Spray the sensor liberally with a non-residue electronic parts cleaner available from most electronics stores. You really need to soak the sensor in the parts cleaner, then allow the cleaner to drain out of the valve openings. Continue to spray the sensor until the fluid runs clear out of the valve opening. The parts cleaner should evaporate completely in a few hours.

7 Reinstall the idle control valve in the reverse of removal.

8 Start the Accord's engine and wait a few minutes while the Accord's computer relearns the air flow and makes adjustments to the IAC