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Old 10-25-2011, 03:07 PM   #1
twenzel
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My GTI is idling rough. Advice?

Hey folks, need some help. Last night, I was driving normally right after filling up with 93 oct Shell and when I stopped at a light the car stalled. It started right back up and was idling like you see it in the video I've linked. It seems the car drives normal most of the time but I started to get on it it acts up again. Also the exhaust smells like the car is running very rich while the rough idle is present. I've done the throttle body alignment and there are NO CODES present. I am also not blipping the throttle, it is doing that on its own.

Mods:
Carbonio Intake
EuroJet TBE

Any advice is appreciated.

http://www.youtube.com/watch?v=qsrxuJxLAQA

Last edited by twenzel; 10-26-2011 at 08:29 AM.
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Old 10-25-2011, 03:12 PM   #2
HatchFanatic06
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Are the rpms surging? or were you pressing the gas?

If your rpms are surging and having problems with stalling a potential issue could be your IAC valve is dirty (i had a similar problem on an older car awhile back). Someone posted a similar problem as you and it turned out that his APR stg 2 CAI was disconnected at the rear. Just an idea for you to check.

*correction* I don't believe our cars have an IAC (think that was an ODB1 feature.) To be honest if this is the case i'm not sure what took over its function maybe within the throttle body itself. Hopefully someone more knowledgeable chimes in here.
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Old 10-25-2011, 03:14 PM   #3
twenzel
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Quote:
Originally Posted by HatchFanatic06 View Post
Are the rpms surging? or were you pressing the gas?

If your rpms are surging and having problems with stalling a potential issue could be your IAC valve. Someone posted a similar problem as you and it turned out that his APR stg 2 CAI was disconnected at the rear. Just an idea for you to check.
The RPMs were surging, I wasnt touching the pedal. Thanks for the quick response. I'll check to make sure all connections on the intake are tight.
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Old 10-25-2011, 03:24 PM   #4
kashak
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I had funny idles, turned out to be faulty intake manifold - got it replaced under warranty. Car smelled like catless too. It's a TSB and I suggest you visit your dealership to get it fixed.
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Old 10-25-2011, 03:27 PM   #5
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Quote:
Originally Posted by twenzel View Post
The RPMs were surging, I wasnt touching the pedal. Thanks for the quick response. I'll check to make sure all connections on the intake are tight.
Do you have a scanner? do you know if your throwing a soft code? might be helpful in attempting to find the problem
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Old 10-25-2011, 03:36 PM   #6
twenzel
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I have a code scanner built into the P3 Vent gauge. Its not showing any codes..

I just tried starting again and it started but the rough idle is still happening. It sounds like there is also a super high pitch tone coming from the intake manifold as the rpms drop. Almost electronic sounding. It's a bit hard to explain.
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Old 10-25-2011, 03:42 PM   #7
ehancock
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Can't watch your video right now, but i've been having rough idle on cold starts for a few weeks, now it turned into severe miss under load and i finally threw a code. One of my coilpacks is failing. Might want to check those out
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Old 10-25-2011, 03:46 PM   #8
jmlivid
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Is the electric sound a beeping? like random sequence morse code? I only have an intake but when I start it up in the morning it does this soft beeping sound.
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Old 10-25-2011, 03:47 PM   #9
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try taking another vid. this time close the doors so the annoying chime goes away and make sure the video shows your feet is no where near the gas pedal.

save it on your laptop and bring it to the dealership but they're probably gonna claim your p3 boost gauge is the problem
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Old 10-25-2011, 03:48 PM   #10
twenzel
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Quote:
Originally Posted by jmlivid View Post
Is the electric sound a beeping? like random sequence morse code? I only have an intake but when I start it up in the morning it does this soft beeping sound.
kinda like that yes but I wouldnt stay its any pattern, It makes the tone when the RPMS drop then stops when the RPMs surge.
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Old 10-25-2011, 03:49 PM   #11
twenzel
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Originally Posted by fatty View Post
try taking another vid. this time close the doors so the annoying chime goes away and make sure the video shows your feet is no where near the gas pedal.

save it on your laptop and bring it to the dealership but they're probably gonna claim your p3 boost gauge is the problem
P3 Boost guage doesnt use a boost tap, it plugs into the OBDII port and reads boost from the ECU. I'll try capturing better video.
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Old 10-25-2011, 04:16 PM   #12
DRedman45
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sounds exactly like a vacuum leak...like kashak said the manifold is a possible culprit...there is a flapper in there and if the motor/sensors go bad it would idle with that surging, but go away at a higher rpms
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Old 10-25-2011, 05:02 PM   #13
twenzel
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Here is a better video. http://www.youtube.com/watch?v=VHIkt3mrvnw

May be a few minutes before its available. I just uploaded.
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Old 10-25-2011, 05:09 PM   #14
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P3 Boost guage doesnt use a boost tap, it plugs into the OBDII port and reads boost from the ECU. I'll try capturing better video.
I know but the dealership will still make the stupid warranty void claim. you'll see

2nd part of the video scared the shit out of me. I turned my volume up to hear your car idle while you were switching programs.

Show the video to a dealer before actually bringing it in
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