Whenever I put my gear in “D, S or L” (Automatic Transmission), my idle will bounce up and down. But whenever I put it on reverse, neutral, or park, I dont experience the up and down idle. This also occurs whenever im idling or at a stop/stoplight and my gear is in D. It gets worst when my AC is on. Any suggestions or any knowledge about this problem? I would highly appreciate any bits of information. Thank you in advance!

 

Hello,did you manage to solve the problem with your car ,I have a honda fit 08 and i am expierencing the same rpm flactuations when in drive mode and r mode ,only at a stop.please help

 

I had these symptoms and I did a valve adjustment as well as changing out spark plugs and coils. I didn't have any error codes, but one of those (or all 3??) fixed the issue.

 

Ok will do the valve adjustment ,had already changed the plugs and the coil packs ,thanks will uodate

 

I had this same issue in my last car (95 civic). I ended up having to replace the air idle control valve (it was beyond attempting to clean.) The first thing I would do is to check for vacuum leaks though