Seems to stumble at idle?
 

Is a stumble during idle normal for this engine?

Need more information. But it is most likely the a/c compressor is turning on and off.

It's been happening to me when the engine is cold these mornings.

At stop signs it almost feels like it's going to stall when idling.

Only until maybe 3-4 minutes into it, it warms up and my idle doesn't seem so uneasy.

I'd say not normal, if the engine is warm.

When it's cold, you may consider letting the engine do its little warm up routine (about 15-20 seconds) before you head out.... :)

humfrz

Hmm...when I am stopped at idle such as waiting for someone there is definitely some stumbling/purring occasionally...I also have always had this in my tacoma.

Also, I have driven hundreds of rentals for my job and they do similiar so I'm under the impression that it is normal unless it starts sounding like it is about to turn off...

It would seem to be common normalty but if I'm wrong I would need to get my cars checked out or like the other person said perhaps it has to do with the AC?

The AC compressor also runs if you have it on "defrost".

Mine does this as well, seems to dance between 500-1000 rpm when at idle with the AC on. Pretty sure it has something to do with the compressor as I hear it click when the RPM fluctuates. I recall my brothers tacoma doing the same thing.

I get a 'stumble' as well when coming to a stop as the rpm drops after I depress the clutch (mostly when cold, seems more stable when warm). Barring the A/C compressor (which results in idle hunting for me) I think it's a consequence of setting the idle as low as possible to squeeze a couple 1/10ths of an mpg out of the car during the city cycle. People with tunes have raised the idle and it seems to get rid of the stumbles and hunting. But I'm just going off of hearsay.

Unless it stalls or you get a check engine light nobody is going to fix the problem for you, it'll be called 'normal operation'. Bleh makes me nervous.

You may be experiencing the "idle dip" that these cars have stock. Mine idled pretty low and rough too when I got it. A good tune with a raised idle helped ten fold. Its soooo smooth now.

Mine does this as well. A few stumbles here and there during a complete cold start but I think it's normal.

What did you raise your idle to?

I am having similar issues

My tuner did this as well. I think its around 800rpm

I think its around 850 right now.

Same thing happened to me but it went away after awhile

K & N Filter
 

The drop in filter took care of that issue for me.

Will check to see if it is related to the defrost.

I might have been doing this since new, but you know how once you notice something you can't help but notice it everytime? Seems to stumble a bit too much for a modern engine. That said, the "boxer" family of engines is new to me.

No CEL so I won't rush to the dealer.

Thanks one and all for thoughts.

I regularly stumble when walking through my doorway on Friday nights.

I am starting to think that just having the radio on is enough of a load on the alternator to cause a blip in the idle... Mine drops from about 550 to 500 rpm when doing the idle drop thing.

Yeah this just seems way more reasonable for a 4-banger, even if it is a boxer.

My idle is always right at 650 but it doesn't feel smooth

Ah, I miss my Honda days. Just turn the idle adjust screw and you're set ;)

http://www.justanswer.com/uploads/yo...205552_crx.JPG

Defroster seems to be the answer. Turned off and less stumble.

My idle is never smooth. Even though the tach needle doesn't bounce, I still feel micro-stumbles at almost regular intervals. Sitting at lights sometimes drives me crazy :)

I hear the compressor in these cars runs at all times.

My idle occasionally stumbles, even after tune. Kind of annoying.

Lets face we may love our cars but the are built like crap it's a shame that they are aware of the trouble and they refuse to fix the issues that so many of us have. Why don't they just get one of these great tuners and get the cars tuned as they should be.

Fallen- guess my was built better than yours since I have zero complaints. Or maybe I knew exactly what I was buying when I bought it

It's the nature of the boxer design. IMO!! Every Subi i've had has a rough idle. Not exceptionally rough, but not as smooth as my Honda was. The important part is the way it performs when moving!

Almost feels like the motor is missing too.... and I think the issue lies elsewhere. My idle is at 750 with the tune and it still stumbles.