95 Civic VX hesitates at 2-3000 rpm

Answer 1

Chris,  This is Ed again.  I found my problem.  There was an arc occuring across the end of the rubber boot that extends the plug wire down through the head.  This happened on two of my boots.  You could just see a very light gray trace across the bottom of the boot. I scraped this trace clean and then coated the end of the boot with a light coating of silicone grease.  This complete eliminated the miss that I was having.  I think it only happened when the engine was warm, because the car goes into lean burn only when it is heated up and I believe that under the lean burn condition the plug is harder to fire and that causes the spark to bypass the plug and arck to the metal wall by way of the rubber boot.  Let me know if this helps you.  [e-mail]

Answer 2

Chris,  I have the same problem with my 92 VX.  I have not solved it yet, but I do have a work around that seems to work for me.  As you say it work ok before the engine is warmed up, but in my case it is not the actual warm up, but the temperature information that is sent to the ECU. So I was able to get mine to run  better if I put a fixed resistor in the temperature sensor plug located just below the distributor.  I would try about 1 K ohm.  Unplug the plug form the sensor (It is a two wire plug) and insert the 1 K ohm (black, brown, red)  resistor in the plug.  By the way, I have changed the fuel filter, distributor, Oxygen Sensor, ECU and Spark Plugs.  All to no avail.   I am still trying to find out where the problem is and will continue to reaearch it.  Email me if you  have had any additional luck with this problem.  Ed  [e-mail]