Rough Idle When at a Stop

Mine dies it all year long, hot or cold. Hence, it gets old really quick.

 

My advice is change the plugs, clean the MAF Sensor and throttle body and replace the air filter with an OEM type filer for now. Then you'll know what has been done and if it persists it'll tell you what is not causing the problem. IMO

 

I finally was able to do some of these recommendations. I changed the plugs (actually still had the original Denso and NGK plugs), the PCV, and cleaned the MAF, air filter, and throttle body. I don't have the original air filter assy.

The PCV looked pretty well used...


The plugs looked alright...


So far the engine seems to idle better but time will tell. I'll keep this post updated as I know more.

 

The surge when stopped is the AC compressor kicking in. Toyota seems to be a little over zealous on the idle speed compensation. If you have defrost selected, even when you are on heat, The compressor can cycle.
As far as the rough idle, I'm noticing my 2010 getting a little rougher, not real bad, and not a random shake. Almost like you can feel every cylinder fire. I'll be keeping an eye on it.

 

Glad to hear what you did helped. As for the plugs, they needed changed. When the electrode burns away leaving it round, it's time for a change. I painted a red line pointing at the electrode, you can see it if you blow up the picture..

 

Sorry to revive an old post, but this is the exact problem I’m having as well...rough idle vibration/sound only when in drive and brake pressed in when stopped. Just recently had the throttle body and injectors cleaned and new plugs put in...asked the dealership to peak at my motor mounts and vacuum to make sure they’re weren’t any issues there but something tells me that they didn’t...
Did anything else end up working for anybody else?? Thanks.

 

My rough idle was remedied by replacing the A/F sensors. I also did the plugs and MAF sensor while I was in there but they looked fine.

 

I'm experiencing a similar thing on my 2006. Its just started. It's not necessarily when I'm stopped... but it's that moment when I am stopping. The idle seems to dip as the car comes to a stop. You feel the slight vibration like it's about to die. But then once I'm fully stopped (in drive and all), idles normal. Perhaps this is the start. It is overdue for new plugs, so I'll definitely do that soon. I've never cleaned the MAF or TBs, but I'll start with the plugs. Thankful for this forum! I'll keep this thread posted with my results.

 

Same thing on my 06...except it’s when I’m at a complete stop. Usually she idles a little above .5 RPM, but there are times when I’m stopped she’ll get sucked down to below .5 RPM, almost like it’s not getting enough air...and that’s when the rough vibration starts, but it never cuts off. Asked a mechanic buddy of mine about this and he said unless there’s a light on that sort of thing is somewhat normal...he works on fords though (lol) so I’d still like to see what a Yota guy has to say. Had my plugs changed, injectors cleaned, and MAF sensor cleaned and it’s a little better than it was, but problem still persists. Will probably just live with it until if/when it gets worse or until next time I’m in the dealership for something else. Good luck and keep us posted.

 

Ok... so I replaced the sparks plugs and... IT WENT AWAY! So there you go: old worn out spark plugs seem to have been the culprit in my case. Thanks again.

 

Same exact symptoms. Change the plugs and performed idle calibration and now fixed.