Hello, I have a 2002 Honda Accord LX 4 cylinder F23A1 engine. When the car is at idle with the AC on I get a random misfire but NO codes. No check engine, no flashing or anything showing up when tested with the code reader.
The car has 130k on it and I recently replaced an o2 sensor when replacing the timing belt. The car runs fine at higher RPM's with no noticeable misfire when on the highway.


Any idea?

 

One more thing I forgot to add. The heater hose busted but most of the antifreeze went down but did manage to spray a few things. I did get a EGR code and cleaned the EGR valve hoping this would fix the problem. I did notice an improvement but every now and then it would misfire (low RPMs). It really doesn't show up unless I have the AC on and at idle.


Any ideas? Anyone???

 

Since it's happening at idle it's unlikely that it's egr related. When was the last time you replaced the cap, rotor, and plugs ? I would use seafoam to check for an exhaust leak.