View Full Version : 2.0T Stage 3 Cold Start Issues
alphaVR
12-27-2013, 06:55 AM
Recently got my car back after a long string of tuning issues (read more Here (http://www.audizine.com/forum/showthread.php/567791-(alphaVR)-PBP-Stage-3-GT2871R-Avant-Build)). Running great except for one nagging issue... for whatever reason, during cold starts, the car takes abnormally long to fire up and start running.
So far, I haven't been able to identify anything else that could be a potential source of the problem. Once the car is up and running, it seems to run perfectly fine with no problems whatsoever. Full boost, no hesitations, nothing to indicate a problem. Only on cold starts does this issue present itself.
I took this video this morning to capture what it does. I've been chatting with my tech and we're still a bit baffled, but Im going to shoot another video tomorrow to see if we can capture a different noise that I may have missed in this video.
https://www.youtube.com/watch?v=YTXcbCb_NjA
open to ideas or brainstorming. Its a minor annoyance right now since the car runs fine otherwise, but I'd prefer to take care of it however I may need to.
Recently got my car back after a long string of tuning issues (read more Here (http://www.audizine.com/forum/showthread.php/567791-(alphaVR)-PBP-Stage-3-GT2871R-Avant-Build)). Running great except for one nagging issue... for whatever reason, during cold starts, the car takes abnormally long to fire up and start running.
So far, I haven't been able to identify anything else that could be a potential source of the problem. Once the car is up and running, it seems to run perfectly fine with no problems whatsoever. Full boost, no hesitations, nothing to indicate a problem. Only on cold starts does this issue present itself.
I took this video this morning to capture what it does. I've been chatting with my tech and we're still a bit baffled, but Im going to shoot another video tomorrow to see if we can capture a different noise that I may have missed in this video.
https://www.youtube.com/watch?v=YTXcbCb_NjA
open to ideas or brainstorming. Its a minor annoyance right now since the car runs fine otherwise, but I'd prefer to take care of it however I may need to.
You must have rs4 injectors! Welcome to the party
alphaVR
12-27-2013, 07:05 AM
You must have rs4 injectors! Welcome to the party
i do... but they were never a problem during cold starts prior to the retuning. Perhaps I am missing something here?
i do... but they were never a problem during cold starts prior to the retuning. Perhaps I am missing something here?
This is a common characteristic of these injectors. When you start the car below 35ish degrees you get very poor idling, even tries to die sometimes.
alphaVR
12-27-2013, 07:24 AM
My idle is fine though... once its up and running, no problems whatsoever with idle at any temp (that ive noticed at least). Its just getting it running from a cold start thats shown to be the issue.
also of note: this started as early as mid october after it came back from the dyno tuner. Weather was still fairly mild... at least in the 50s or 60s... and was having issues then as well.
I figured it was a spark plug issue, so I swapped them out this weekend. These are what they looked like coming out.
https://scontent-b.xx.fbcdn.net/hphotos-ash3/1521290_10202768421758362_1068076414_n.jpg
put in another set of BKR7E coppers... turns out those are OE plugs and I might need to go colder... but even then the car seems to run just fine after its started. Just those cold starts continue to be a problem. and like I said, it was never a problem before i got it "retuned" the first time.
soooooooooooo yeah. really baffled. lol
My idle is fine though... once its up and running, no problems whatsoever with idle at any temp (that ive noticed at least). Its just getting it running from a cold start thats shown to be the issue.
also of note: this started as early as mid october after it came back from the dyno tuner. Weather was still fairly mild... at least in the 50s or 60s... and was having issues then as well.
I figured it was a spark plug issue, so I swapped them out this weekend. These are what they looked like coming out.
https://scontent-b.xx.fbcdn.net/hphotos-ash3/1521290_10202768421758362_1068076414_n.jpg
put in another set of BKR7E coppers... turns out those are OE plugs and I might need to go colder... but even then the car seems to run just fine after its started. Just those cold starts continue to be a problem. and like I said, it was never a problem before i got it "retuned" the first time.
soooooooooooo yeah. really baffled. lol
Yeah its injector shenanigans. My injectors usually start( crank and start) fine when its above 40 degrees then it idles a bit weird then after I drive like 30 seconds its like normal injectors. When it is below 35ish, it takes quite some time to crank, maybe the engine turns over like 6-8 times before it actually fires up, and then idle drops low, and it stutters, or sometimes the idle goes all over the place and it tries to die. All part of the fun of having rs4 injectors, time to get some s3's. I'm in the same boat.
alphaVR
12-27-2013, 08:21 AM
and it stutters, or sometimes the idle goes all over the place and it tries to die. All part of the fun of having rs4 injectors, time to get some s3's. I'm in the same boat.
not having any of those symptoms though... [confused]
glissoar
12-27-2013, 09:35 AM
I had this same issue with my set up, running the RS4 injectors but I got my tune re-worked (united Motorsports) and since then its been fine, there is a slight pulse in the rpm's at first start up and idle but it settles out after about 10 seconds. Haven't had cold start issues since, What tune are you running?
vce1232000
12-27-2013, 09:50 AM
Ah the beauty of having S3 injectors[race]
rnp614
12-27-2013, 10:03 AM
I thought AWE's kit was S3 injectors?
viziers
12-27-2013, 11:11 AM
It's all in the tuning. I did have cold start issues when I had Vast tuning and slight issues when Evan first started tuning my car but now I have no issues with cold starts when temps get to 20* or lower.
vizi
glissoar
12-27-2013, 12:19 PM
It's all in the tuning. I did have cold start issues when I had Vast tuning and slight issues when Evan first started tuning my car but now I have no issues with cold starts when temps get to 20* or lower.
vizi
This!
Hugh@EuropaParts
12-27-2013, 12:22 PM
It's all in the tuning. I did have cold start issues when I had Vast tuning and slight issues when Evan first started tuning my car but now I have no issues with cold starts when temps get to 20* or lower.
vizi
Hi vizi... long time no see in these B7 forums...
alphaVR
12-27-2013, 03:36 PM
Its running a custom C2 tune based off their Stage 2 FSI tune. Theyre versed in stage 3 stuff, though they dont publicly have any kind of stage 3 tune for the FSI platform.
Id like to rule out hardware issues (fuel pump, etc) before going back to C2 with the ECU and having them update the tune again.
abzoni
12-27-2013, 03:41 PM
It's all in the tuning. I did have cold start issues when I had Vast tuning and slight issues when Evan first started tuning my car but now I have no issues with cold starts when temps get to 20* or lower.
vizi
^I'm going to agree with him on this one. If you can find a long stretch of empty road near you, floor it from 3k rpm in 2nd to redline in 6th. It might magically fix your cold start issues, ask me how I know :P
Ju$t4Kick$
12-27-2013, 05:27 PM
I love when I come here and find that we all have the same problems...It takes my worries away lol...
Also do you guys think those plugs should be replaced? Just wondering mine look similar and was thinking that might help.
ericpaulyoung
12-27-2013, 06:38 PM
Two words: Get the right injectors!
jsandor91
12-27-2013, 07:48 PM
Two words: Get the right injectors!
thats three words!
thats three words!
That's^ three worths, but he said four words.
lol this community has a terrible math problem.
jsandor91
12-27-2013, 08:22 PM
That's^ three worths, but he said four words.
lol this community has a terrible math problem.
oops forgot the ' . but i was joking i know it was four words. i'm good at math remember lol.
oops forgot the ' . but i was joking i know it was four words. i'm good at math remember lol.
oh yeah how could I forget.
http://www.quickmeme.com/img/6c/6c0f99a0eba18a229857527a53ae1591537d3f07a9c0726ee6 760a35072be336.jpg
alphaVR
12-27-2013, 10:44 PM
LOL
I asked about the injector thing a while back... got a mixed bag of results.
S3s have better spray pattern for 2.0t
RS4s flow more
Thats the general consensus that ive gathered thus far.
LOL
I asked about the injector thing a while back... got a mixed bag of results.
S3s have better spray pattern for 2.0t
RS4s flow more
Thats the general consensus that ive gathered thus far.
Truth, I just looked at your video though. Are you referring to the fact that it idles high then drops? That's normal.
LINDW4LL
12-27-2013, 11:35 PM
Truth, I just looked at your video though. Are you referring to the fact that it idles high then drops? That's normal.
Looks like it was cranking for about 5 seconds before it turned over.
Also is that a Cobra? Obnoxious haha
alphaVR
12-27-2013, 11:38 PM
dont hate on my cobra! had that thing for... 8ish years. saved my ass on many an occasion lol
yeah the issue is it just not firing up as youd normally expect. the high rev i expect. SAI, etc gotta run, then revs drop to normal idle. its the cranking and cranking and cranking and then fire that I was asking about haha.
The only thing that seems weird to me is the fuel pump prime. I can't hear it very well but it seems incredibly short.
the lots of cranking is one of the handsome qualities of the rs4 injectors
alphaVR
12-28-2013, 01:23 PM
threw this together this morning.
http://www.youtube.com/watch?v=ymLlf9AyJh8
seal66
12-28-2013, 01:34 PM
threw this together this morning.
http://www.youtube.com/watch?v=ymLlf9AyJh8
Sounds like you have a weird stumble noise kinda.
Sent from my Nexus 7 using Tapatalk 4
esandes
12-28-2013, 09:46 PM
these tuners should wake the fuck up and sniff the folgers. i have 2+ and some of my cold starts are pathetic. i guess it's easy to get the steady state tune down but what separates the men from the boys is the cold start tuning.
aluthman
12-29-2013, 04:33 AM
If your cold starts are shitty at stage 2+, it's probably not your tune that's causing it.
esandes
12-29-2013, 04:18 PM
If your cold starts are shitty at stage 2+, it's probably not your tune that's causing it.
it's the 2+ w/ RFD deletion. when i had the flappers the cold starts were always perfect.
ericpaulyoung
12-29-2013, 04:36 PM
it's the 2+ w/ RFD deletion. when i had the flappers the cold starts were always perfect.
Ya, the RFD delete is shit. Put those things back in; taking them out adds zero power for a stage II+ or even any stage III car that doesn't have at least a GTX3582R turbo.
epy
esandes
12-31-2013, 10:28 PM
Ya, the RFD delete is shit. Put those things back in; taking them out adds zero power for a stage II+ or even any stage III car that doesn't have at least a GTX3582R turbo.
epy
no kidding. the audi engineers knew what they were doing. without them the cold starts are a joke.
no kidding. the audi engineers knew what they were doing. without them the cold starts are a joke.
Shouldn't be an issue for a man of your wealth!
alphaVR
01-02-2014, 08:24 AM
Sooooo did some datalogging while recovering from new years.
click here for the results from that.... (http://www.audizine.com/forum/showthread.php/567791-(alphaVR)-PBP-Stage-3-GT2871R-Avant-Build?p=9331957#post9331957)
did, however, notice this little fault code sitting in the engine module that had never thrown a code. happened about 75 miles ago, which would equate to sometime Tuesday
012555 - Low Pressure Fuel regulation
P310B - 002 - Fuel Pressure Outside Specification - Intermittent
Freeze Frame:
Fault Status: 00100010
Fault Priority: 2
Fault Frequency: 2
Reset counter: 255
Mileage: 238370 km
Time Indication: 0
Freeze Frame:
RPM: 6229 /min
Load: 61.2 %
Speed: 135.0 km/h
Temperature: 88.0°C
Temperature: -2.0°C
Absolute Pres.: 980.0 mbar
Voltage: 14.097 V