High idle at stops >= 1k

[philly.c]

so when that happens what goin on with the engine? ie is it cold/ hot all the time, has it been idling for a long period of time? if it does it after idling for a period of time i could be like a evap system running/ purging and there is a fault with that system. if you have a vag- try running the evap test.

That's what I'm trying to figure out, what is the common factor here. Nothing so far has jumped out at me. No vag-com. Fan is not on and does not kick on. Warm/cold outside, garage parked or outside parked, A/C on or off, gear position doesn't make a diff.

One note is that it doesn't happen immediately after starting. IE, the first few stops it won't happen, but once it does, it will happen again at each long stop for the rest of the drive (even after 2-3 hours of highway driving).

I am getting the sub-frame bolts replaced next week and will have the dealership investigate the following things based upon feedback in this thread:
-vacuum leaks
-battery status

I need to keep this limited as this issue is a black box to the shop, even if they can reproduce it in a tech test drive and I will be charged for diagnosis time.

And just to note again, I have no mods except a disconnected and plugged flapper vacuum tube and AFE panel lifetime air filter. All maintenance should be up to date AFAIK.

[mfbmike]

Has anyone stopped to think it may or may not have to do with the tachometer gauge(s) acting up? Probably the least likely culprit but you never know.

[oldracer]

^ No, increase in idle speed is very audible and adds vibration when it happens, (at least to me).

OK 1 small item I left out, I added 6 oz's of Marvel Mystery Oil when I fixed the loose CAI clamps and checked the connections under the hood.
Probably not important, but I run it thru the fuel system about once/month, (3 tanks/month is all I use normally). I've used this stuff since I started driving, (46 years ago) at my dad's advice, always keeps the fuel system pretty clean & haven't ever had an issue with any vehicle....
personal experience, you may not care!

As of today, running perfectly, not a hint of anything, I even tried tapping the accelerator pedal at 4 stops in a row to trigger it - Nothing, dead steady 650 rpm idle is back.

I firmly believe it's a vacuum leak in my case, but all other hypothesis are legitimate possibilities guys....

I'm giving the R to the lead footed test driver tomorrow - (wife) and she if she can trigger it....

I will be driving Das Boost, which now has a license plate frame that says that!

Always a surprise to drive 310 ft lbs after the R... sudden wheelspin is not part of the r life....

[Slave IV]

I'll just add again that for me, it only happens after I've parked outside all day...never after leaving from my garage.

Luckily, it seems to have gone away again on its own...for now.

[gottiR32]

I'll just add again that for me, it only happens after I've parked outside all day...never after leaving from my garage.

Luckily, it seems to have gone away again on its own...for now.

I still think this is just how the car is...

[vwracin86]

eh im still leaning towards the evap maybe. a vacuum leak would be a more constant thing, unless the hose has completely collapsed on it self sealing off, but that would open back up after doing some full throttle pulls

[ncraba01]

Please, BE CAREFUL: don't do this inside a building, have disaster materials handy (fire extinguisher, etc.), don't do it alone, have the other person stand away from you and the car in case bad stuff happens.

You can confirm you have a vacuum leak by using propane around the fittings. Let the gas out around the suspect fittings and if the idle increases then you are in the area of the leak.

Other explosive/combustible gases beside propane work too.

AGAIN, playing with combustible gasses around internal combustion engines is dangerous!!! Use extreme caution and think about what you are doing and where you are doing. Internet Darwin Awards are only funny when it’s not you!

[ncraba01]

eh im still leaning towards the evap maybe. a vacuum leak would be a more constant thing, unless the hose has completely collapsed on it self sealing off, but that would open back up after doing some full throttle pulls

Full throttle pulls would likely make it worse, collapsing the hose further as more air is demanded (higher RPM) and creating more heat thus weakling the hose more. Shutting of the motor would make it better by removing vacuum.

[xbr80bx]

charging system

PM me when you figure it out, so you can tell me I'm right.

[gottiR32]

Please, BE CAREFUL: don't do this inside a building, have disaster materials handy (fire extinguisher, etc.), don't do it alone, have the other person stand away from you and the car in case bad stuff happens.

You can confirm you have a vacuum leak by using propane around the fittings. Let the gas out around the suspect fittings and if the idle increases then you are in the area of the leak.

Other explosive/combustible gases beside propane work too.

AGAIN, playing with combustible gasses around internal combustion engines is dangerous!!! Use extreme caution and think about what you are doing and where you are doing. Internet Darwin Awards are only funny when it’s not you!

Who invited Yyrds mom...

[oldracer]

another bogus guess/shot in the dark! - charging system umm no, mine was spot on, battery passed load test....

Fixing my vacuum leak seems to have done it....
Maria Andretti, (the wife) beat on it today and pronounced it an awesome fun car that ran perfectly ....

I was forced to drive the GLI - OMG torque & boost are really fun!!!

[Slave IV]

If it comes back again, I'm going to check my air filter again...may have not sealed properly when I opened it to check right after my Mech service.

[odawg753]

I was driving today and mine did the same exact thing. I then stopped at a store came back out and my battery was dead. I then pushed start it to get it home. While I was driving the alternator light flashed on. This is on my mk4 vr6 Gti btw. I know on old cars if u unhook the battery while running and it stalls its the alternator I did that and it shut right off. Not sure if it does that regardless

Sent from my DROIDX using Tapatalk

[brennok]

Mine also started doing this. I have under 30k and recently had the Mechatronic recall done.

It seems random here. Sometimes it happens when I first start the car and sometimes when sitting at a light.

Glad to at least know I am not alone here.

[gottiR32]

It's like a focus group in here...

[ncraba01]

Who invited Yyrds mom...

I'm not your mom. If I were your mom, here are just a few things you would know already:

• Spelling
• Its not nice to post just to see your post count go up
• You missed the gift of humor (at least in this thread)
• If you haven't got anything nice/productive to say, keep your comments to yourself.

Hope you get your issues resolved!

[gottiR32]

I'm not your mom. If I were your mom, here are just a few things you would know already:

• Spelling
• Its not nice to post just to see your post count go up
• You missed the gift of humor (at least in this thread)
• If you haven't got anything nice/productive to say, keep your comments to yourself.

Hope you get your issues resolved!

I said nothing about my mom, I don't post to watch my count go up...and spelling??? The other two are not important because if you don't like what I say then you can goto a different forum and preach saftey...

[BetaOp9]

Be nice to the gotti.

[gottiR32]

Be nice to the gotti.

[AmRando]

Well, I'll just add my 2.02 exchange-adjusted cents.

I'm at 28,000mi and have also experienced the 'random high idle at stop', usually once or twice a week during morning or evening commuting. It does *seem* to be more frequent since my mechatronics recall which was just 2 months ago.

So.. the checklist of possibilities so far is:

-vacuum leak
-battery test for voltage drop
-???
-PROFIT

[Slave IV]

My car has been fine lately but I had to stop by at my tech's shop this morning for something so I had him check it out. Scanned my car and nothing showed up...car has a perfect history with no issues. I asked him about the vacuum leak and voltage and he said he thinks it is related to vacuum/a booster hose and not anything electrical. Difficult to go any further since my car has not had the issue in a while and I had to leave for work but I'm confident now that it must be related to a vacuum leak because my tech is the best I've ever met at diagnosing these cars. Hope someone who has the issue more frequently can get a dealer to pinpoint exactly where it's coming from.

[oldracer]

After 2 weeks of no problem, it's back.

Every stop this morning it went from 650 to 1,000 and stayed there....

I am going to have the Tech go over it as we are driving it to Boston in 24 days.....

Otherwise runs flawlessly with great power etc.

I will update when I find something

[abeR]

its the he.:Rps




sorry guys!

[jalopeno2575]

Hey everyone,

When I first read this thread I figured it was just normal idling while running ac but apparently I didn't read it well enough. Not much sooner after reading this thread I had my 40k mile service done and wouldn't you know it, I've noticed the higher idle at stops.

So, just to basically agree with everyone in this thread that I've been having the same "symptoms". I drive 100 miles a day for work, my car sits outside overnight, and an hour drive to work where it sits for a good 13 hours. So far outside air temps haven't seem to have made a difference or ac on off. Car is always at normal operating temps by the time it starts happening, and just like everyone else has said, it lasts for a good 20-30 seconds and once it happens it's pretty much certain that it will happen again.

I plan to take some time and run through the ideas mentioned thus far like the battery and vacuum lines. Maybe once mother nature decides to take a break from bashing upstate ny (earthquake, hurricanes, flooding, and even tornados) I'll have some time to give her a good once over. Oh, and before I forget, but I know it seems to be of no importance with this issue, my car is mostly stock with the exception of a neuspeed intake and exhaust.

[Saabstory02]

Sorry all; Just wanted to add this for firepower if you need it with the dealership:

My car is now approaching 91,000 miles and has never done this once in it's life to date... Hot or cold, rain or shine it idles at 650-700 tops, even with AC on.

So if they try to tell you it's normal, tell them about the 91,000 mile R32 and what normal means

[10Ten]

Sorry all; Just wanted to add this for firepower if you need it with the dealership:

My car is now approaching 91,000 miles and has never done this once in it's life to date... Hot or cold, rain or shine it idles at 650-700 tops, even with AC on.

So if they try to tell you it's normal, tell them about the 91,000 mile R32 and what normal means

+1, but i'm only at 59k. not once.

[abeR]

check these MKIV R threads...

http://forums.vwvortex.com/search.php?searchid=13355910

they suggest its a MAF or hose connection problem

[Slave IV]

check these MKIV R threads...

http://forums.vwvortex.com/search.php?searchid=13355910

they suggest its a MAF or hose connection problem

Your link didn't work but that's exactly what my tech said and the area he checked on my car...it just hasn't done it in a while so not much more to check.

Interesting there is another case of it coming up only after dealer service..I should've just stayed away from the dealer but I had to have the mech recall done there

[abeR]

just search high idle in the other R forum.. you will see what I was pointing to.

not sure why the link borked.


maybe its me!

[oldracer]

OK, more food for thought::

My tech found, no vacuum leaks
No loose electrical connections
No charging system anomalies
No oil on MAF
No coil or plug problems

What he did find was;

wait for it.........................

Out of spec parameters for the MAF at idle, so he ordered me a new one which should be in in 1-3 days and we'll see what that does.

I also agree with Abe, this is NOT NORMAL, my car never did it once in it's first 25,380 miles....
and my Tech assures me it shouldn't ever do it unless there is an issue....

[Slave IV]

Now I'm wondering...would the dealer have to move the MAF for a Mechatronic, haldex and dsg service? Wonder why this only happened after visiting the dealer for a couple of us.

[abeR]

This has nothing to do with the haldex service, wrong end of the car Slave

If anything it's due to the removal of the airbox for the DSG filter, or they funked a hose when doing so.... Or your alternators are going bunk.

[Slave IV]

If anything it's due to the removal of the airbox for the DSG filter, or they funked a hose when doing so....

This sounds highly likely

[BetaOp9]

Now I'm wondering...would the dealer have to move the MAF for a Mechatronic, haldex and dsg service? Wonder why this only happened after visiting the dealer for a couple of us.

If anything it's due to the removal of the airbox for the DSG filter...

This sounds highly likely

You're the one who asked if the dealer would have to touch the MAF for any specific service. He answered you...you make no sense.

[Slave IV]

Do I have a groupie or something?
He answered and I agreed...do I have to explain something to you more clearly than that?