Question about 1986 Honda Accord

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1986 Honda Accord DX - too high idle on cold start

Idle is too high on cold start; idle does not decrease until engine is at normal operating temperature. Any suggestions????

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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. It's amazing how much better the car runs after cleaning out those ports.

Posted on Sep 27, 2009

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Please accurately describe the location of the ports to be drilled out thx

Posted on Dec 06, 2009

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Hi, i own a honda accord 91, and its start to acelerate an deacelerate by itself, i dont have idea what could t be thaks


if when its cold and runs at a high idle like normal, and then when it reaches operating temp it starts to fluctuate in the revs. (up and down from 900 rpm to around 2500 rpm) you will find that the engine management temp sender is faulty. To ensure this is the fault. When its doing this and at normal running temp. stop the engine, Disconnect the battery for a couple of minutes. Reconnect the battery this clears all the codes stored buy the computer. Start the car while still at the normal operating temp. If the problem is gone it is the sensor i have previously stated. This sensor can be found on th back end of the cylinder head its a two wire sensor. I hope this has helped.

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My 98 Honda Accord Vtec 4cyl. eng is starting fine, but after start the idle dips a few times and regains for approx. 3min. If I drive without warming up the car will hesitate and the gas pedal will delay...


Seems like the coolant temperature sensor is giving the computer erroneous readings, and it is not adjusting the fuel mixture properly for cold engine operations. You should have the check engine light on, indicating this malfunction. The idle fluctuations are normal. The engine is trying to die, from the improper cold mixture, and the computer (ECM), recognizing low idle speed, is sending it back up. Another possibilty is that the butterfly on the throttle body is not closing completely, to allow richer mixture needed for cold starts.

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1986 HONDA ACCORD IDLES TOO HIGH 3000-3500 RPM


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My 1986 honda accord runs at a high RPM when cold and dies when its warm


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Honda Accord 1991 idles high then low


)The fact that thge engine idle fluctuates when it is cold indicates that the Fast Idle THermo Valve is out of adjustment.
This valve is located ot the front of the intake manifold on the driver's side just below the accelerator cable. To adjust it, wait until the engine is cold (best to do it first thing in the morning).
Remove the two screws holding the cover on and start the engine. There is a brass needle sticking up through a plastic ring that has two slots in it. With the engine idle fluctuating, use a thin flat blade screwdriver to SLOWLY turn the ring CLOCKWISE
until the idle stabilizes. Once done. put the cover back on withg the two screws and you should be done.

Jun 04, 2008 | 1991 Honda Accord

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