Chard-broiled

When I make sudden stops or sometimes normal stops my idle bounces back and forth from 800 to 500rpm's. When it dips to 500, the car starts to vibrate quite a bit. I'm running the turbonetics kit with an emanage blue at 8psi and thats about it.

Can you guys please help me troubleshoot and give suggestions? Your input will be greatly appreciated. thanks

paulky_2000

Mine does the same thing sometimes.....as does many others here on SL. It seems to be quite normal and won't harm a thing. Also, it doesn't seem to be a manual vs. auto problem either, although it's a bit more pronounced in the auto cars.
Unless your car is stalling-out I wouldn't worry about it too much.

B_Real45

It could be your vacuum. When you apply brake pressure, it alters your vacuum a little. It'll alter it more if you have a vacuum leak somewhere.

I have a T'netics kit and it does oscillate back and forth sometimes, but not so much to where I think it'll die. I'm on the stock Unichip right now.

dave2610

happens to me too im running a dezod kit

Chard-broiled

That's a sigh of relief. Thanks for the help guys.

Tc4Eva

I would check for vac leaks, then clean the TB, and if you dont have a recirculated BOV, I would make it recirculated. My buddy was having the idle issue with his turbo until he recirculated it, and he doesnt have the prob anymore. And he also does hard stops.

paulky_2000

Just in case you aren't familiar w/ a recirc BOV:

A bit quieter too!

paulky_2000

Oh wait...you're running the T'netics kit already. Nevermind!

GhostFaceKilla

I have the same problem. Too lazy to fix...

Pecka13

I have the same problem, when i throw it into nuetral i see the RPM's get below 1k...also the AFR's bounce to 16.3 (the red) So im not sure if i should be calling my tuner now maybe this is normal with you guys..

greddy 18g turbo with various custom parts and AEM FIC

dave2610

from what ive read around here both those things are common

deathbyc4

when it bounces it doesnt know if it is deaccelerating or not so it cuts fuel, thats why the afr is so lean at times. This is common.

Pecka13

ok good cause i was getting worried i was gonna blow up soon

Chard-broiled

Sorry but does TB stand for Throttle Body?

Mouse

the other thing that could be slightly "magifying" this normal issue with your guy's tCs is running forced induction. This flux in the rpms... mainly when coming to an idle after higher rpms is due to the VVT-i, which is prefectly normal that's how this type of valve train works. From what I've seen N/A setups aren't as noticable with that jump as forced induction setups do.

preston2580

mine does the same thing, does it get less pronounced after your car has warmed up and been driven around for a while?

Tc4Eva

Ya I do mean the Throttle Body. When I had my S/C installed, it did the same thing, wouldnt idle, would die when I let off, even at 2-3k rpm. Week later took it back to the dealership to see what was up with it, and they cleaned the TB, after that its been fine.

Chard-broiled

Thanks. I'll be sure to clean the "TB" soon. hahaha