SOLVED: Idle Dip only when coming to a stop?
 

Hey guys having this weird issue for the past month now. Past 2 mechanics can't figure it out. As I'm coming to a stop my car shakes a bit and rev vips about 100-250 rpms then goes back to normal after coming to a complete stop. This happens during start up and goes away after 15/20 minutes of driving. I just redid my spark plugs/coil packs and have 41k miles. It almost feels like a vacuum leak of some sort. Anyone have any idea on what I should look for?

Edit 04/16/2015:
So I took the Intake Hoses out and saw the throttle body had a shit ton of gunk in it. Outside of butterfly spacer and inside.. Seems like the gunk was literally at the rim of the butterfly and may have been the culprit. I sprayed MAF cleaner and wiped it clean and let it dry off for an hour. She is purring like a god damn kitten now baby! I'm glad I managed to fix this myself without throwing more money at a mechanic / dealer. I just hope the problem doesn't come back. Will keep you all posted in a hundred miles! BTW Warning: Please be FRIGGEN CAREFUL when cleaning your TB.

Do you have an aftermarket air intake by chance?

-RyanG

Negative on the intake. Still stock. Only bolt on so far is my exhaust. But this issue has been happening long before I got the exhaust installed (2 weeks ago.) Since I first purchased the car it's been doing it. At first I assumed it was just cold start. But it never went away :|

ECU calibration on some of the 2013's did this. I had the dealer flash the latest version and it went away.

This...take it to the dealer and ask them to check for the rough idle service bulletin.....that should fix it.

My 2013 has done this from day one buy never drops below 500 RPM and never makes the car shake, so never did anything about it.


I notice that it is more likely to occur with sudden stops. Less likely with gradual stops.

I had this problem, dealer reflash fixed it.

Pat

Mine also did this, and my dealer said it was due to my AC compressor kicking in/out. I was not impressed with this response as the car should not "almost stall" in idle, regardless of the compressor coming on. I did notice that with the AC turned off, it was not as bad.
Issue has gotten better in time.

Mine does it even after a tune. Like Kfresh23 said it's not as bad with the a/c off.

^ THIS ^

Pop the hood and start your car. You'll see/hear the idle dip you're talking about when the A/C compressor kicks on/off.

AFAIK it's not an issue, just a quirk.

A small "dip" is common in any car when the A/C compressor kicks on..

However the hard dip when the car shakes was fixed in a service bulletin as stated. Or you can buy an OFT and flash a tune.

Its not going to hurt the car, just a minor annoyance.

Mine does this as well. Dealer reflashed and it still does it. Annoying.

What the fuck is the point of the a/c compressor cycling on and off literally every 5 seconds? Is there a good reason for it?

Keeps it cool when you aren't moving.