Question about 1992 Honda Accord

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1992 Honda Accord EX 4 cylinder automatic [engine RPM change]

For example, driving on the highway at 65 mph the RPM of the engine will stay at around 2800 then jump 100 to 150 RPM's then come back down. The engine at idle will primarily do the same thing. It will idle at 600 RPM then jump up momentarily 100 RPM's. The engine has 109,000 miles, timing belt was replaced at 30,000 miles and the transmission has 18,000 miles on it since a rebuild.

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It seems to be clutch problem.

There is a way to slightly adjust the idle,on the front of the throttle body where the intake boot is bolted on,abovt the boot and slightly to the left you will see a hole about 1/2 inch wide and it is plugged with grey epoxy like material. Using a flat head screw driver scrape the epoxy out of the hole and there is a flathead adjustment screw. You can adjust the idle up and down just a few hundred rpm. Hope this helps and let me know if there is any more direction you need.
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Posted on Feb 14, 2009

  • Rylee Smith
    Rylee Smith Feb 14, 2009

    The idle i am talking about is the idle control valve(ICV)


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I had this type of problem on my 93 EX. What is happening is the lockup clutcth in the transmission is engaging and disengaging. When the vehicle is a higher speeds, there is a clutch in the torque converter that locks it up so there is a direct drive from the engine through the transmission (no slippage at all in the converter) to increase efficiency. However, when encountering a grade (uphill), the clutch may unlock (now driving through the fliuid in the torque converter), allowing the engine to speed up and provide more power for climbing the grade; when it reaches the top of the hill, the clutch should lock up again and the rpm will drop. Check the transmission fluid level, if it is low it may affect operation of the clutch. You might also want to consider changing the fluid. There is a drain plug on the bottom of the transmission (no filter to change). You'll only get about 2 of the 6 quarts out of the transmission when you drain it. I recommend you drain it once, refill it, drive it a short distance, then repeat one or two more times so that a majority of the old fluid is replaced. If you think it is acting abnormally (mine would lock up going uphill, then unlock going downhill), there is a cable operated by the thottle cable that attaches to the front of the transmission that provides throttle input info to the transmission. This can be adjusted (I forget which way I had to move mine to correct my problem). If you do mess with it, a small change (1/2 turn) may be all that is necessary.

Posted on Feb 15, 2009

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