Hello All, Rosen here,

I have a 2007 Honda Accord CL9 Executive k24a3 manual, which ever since I bought it 2 months ago (I guess I missed it during test drive) would drop revs very fast and they would go 200-300 below target when I'm coming to a stop and press the clutch. It happens from cold to fully warmed up where it's almost gone. However when running the AC the revs would drop very low to around 500 and the engine would vibrate and then compensate the revs back to around 900 until they slowly go to normal around 720. The tb has been cleaned, another tb has been tried, valve clearance has been done, engine oil changed, coils have been changed to a FAE brand before I bought the car, new plugs NGK bkr7eix - 2667. The car starts and runs great, returns better fuel economy than I hoped prior to purchasing, it still has the cat, doesn't burn more oil than normal 300ml for the past 3500kms, it revs out fine, goes into VTEC where it's supposed to. No fault code, STFT is +5% , LTFT are on target, battery charges 13.8v with the AC and the headlights running, calculated AFR on idle 14.6-7:1. The car has 363000kms or around 215000 miles.

 

Where are the possible air leaks on the intake side of this engine? Maybe I could start there..

 

Still not fixed, any idea?