Need to check vaccum lines a bad throttle position sensor bad map sensor or any other number of things could be wrong with it. You may need to take it to a shop and have them diagnose it with a scanner in order to get the proper diagnosis.
1986-1989 Honda Accord with Carburetor have a very bad habit that is little known even by most mechanics but easily fixed at home. The vacuum port on the choke opener that is connected to the intake manifold and both vacuum ports on the fast idle unloader get plugged up with nasty hard carbon almost as hard as metal. When this happens the choke sticks closed and the idle sticks on fast idle when the engine is cold and nobody can figure out why. All you have to do is attach a small drill bit to the end of a flexible socket-driver extension and put it in a variable speed drill that will let you run it real slow and carefully drill out the vacuum ports that are plugged. After they are nice and clean use a vacuum pump tester to make sure the choke opener and fast idle unloader are working before putting it all back together.
'90 Honda Accord will start but shut off. What could this problem be?
My Honda, in good running condition, idles at 700 RPM This is what it idled when it was new. For the 1989 Honda your idle speed should be between 750-1000 RPM and if you have any questions look under your hood and it will tell you right there.
check the vacuum hoses
Honda Accord 1998-2002 model GEN 6 idle speed is control by internal computer. You need to bring it to the dealer to adjust this.
To increase idle on the 2004 Honda Accord petrol model, apply carb cleaner on the adjustment screw on the throttle body to loosen up any form of debris. The car that I am enquiring about is UK model of a honda accord.
Go to the mechanic down the blocc
it should be on the throttle body
The idle for a 1986 Honda Accord is adjusted by a idle air control valve. These function by either tightening or loosening the valve. This controls how much air is allowed into the system, more air means higher idle and less means lower.
The idle air control valve controls the neutral idle of the 2001 Honda Accord. A faulty idle control valve leads to an erratic idle. To replace it first locate the valve on the intake manifold. Unplug the unit and remove the three bolts holding it to the manifold.
right on the side of the throttle body.
Engine miss at idle. Can be caused by vacuum leak.