MK5 Golf GTI
All Things Mk5 => Mk5 General Area => Topic started by: ruffrydaz on February 22, 2011, 01:26:08 am
-
I have a 2.0 gt tdi 140 remapped to about 180. It has 89k miles and is from 2004.
I experienced limp mode twice in the last month, usually up a hill.
Here is vagcom results from 1.5k to 4k in 3rd gear
The only error that comes up in vagcom is egr insufficient flow even though i cleaned the egr and changed the intake flap.
Here is the results
(https://www.mk5golfgti.co.uk/forum/proxy.php?request=http%3A%2F%2Fi54.tinypic.com%2F28bh3ya.png&hash=28a4137c123776f272b58a99f1dce3a79b8cee69)
-
Not too sure but I'll start the bidding on a sticking wastegate.
-
That can be associated with sticking VNT vanes, often on standard cars.
My thoughts would be that it's possible the map is requesting too much boost. Who did the map??
-
My 2.0tdi was doing this on the rolling road, next minute the turbo went pop.
-
Thanks guys
Yeah just wondering what i can check before i get the turbo cleaned.
www.mobileecuremapping.co.uk did it
Has anyone heard of them?
-
I've not heard of them but you could contact them and ask them to adjust the boost levels a little.
There was a spate of this with a while back which was linked to a similar situation with a 'meet you in the layby' or 'we'll come to you' type remapping company who I'll not name here.
-
A quick look around their website speaks volumes -
You can buy a file for £80 + VAT - http://www.mobileecuremapping.co.uk/custom-tuned-files/
You can buy the tools or a franchise from them, probably without any experiance - http://www.mobileecuremapping.co.uk/join-the-team/
No premises listed - http://www.mobileecuremapping.co.uk/contact/
-
(https://www.mk5golfgti.co.uk/forum/proxy.php?request=http%3A%2F%2Fwww.thekidswindow.co.uk%2Fimages%2FCMScontent%2FImage%2Fcowboy.jpg&hash=507ead4ff17de356c963fb132e462009b19507af)
-
:scared:
sounds like sticky vnt mechanism btw. see this a lot, google it :happy2:
-
Thanks guys.
I guess at 90k miles it needs to be cleaned anyway. The remap was on a month before limp mode came..
Anyway ill get it refurbed(how long can it go on for if i do that) and reply back, or shall i just buy a refurbed one?
thanks
-
Any 'siren' noises from the turbo?
-
This is usually to do with the map requesting too much boost, had this on a previous car and the car was constantly in limp mode until i got it remapped (it came with a dreadful map on the car).
I'd consider talking to a local tuner and get it on the rollers to diagnose the problem, any good tuner will be able to tell you if its the map or not. should cost no more than £70 and will save you from pissing your money away on possible cures that dont fix it.
Cal
-
Well id prefer if it was the map and not the turbo
Slight whistling when boosting but thats always been there
I was thinking of that but just dont want to go on the rollers just in case its the turbo and it pops.
So its probably the map or turbo
-
http://www.technologie-entwicklung.de/Gasturbines/VNT15-Turbo/body_vnt15-turbo.html (http://www.technologie-entwicklung.de/Gasturbines/VNT15-Turbo/body_vnt15-turbo.html)
-
Thanks guys, refurb mine or buy a refurbed one?
The map seems to be requesting less boost at peak and the actual boost goes over
-
Look at your map first.
-
ok i will do thanks
-
Any 'siren' noises from the turbo?
What do siren noises indicate? I hear these sometimes when cornering. I thought it may be bearing related?
-
Oh the joy of mobile remaps with no real testing or tuning, your in the same position as many of our customers that have had what we call a car boot sale special in the trade, paid for a product and may need to spend more to get it right.
Where are you based? I will probably have a contact that can read the map off and send it to me, I will gladly look at it for you and see if there are any obvious mistakes or maps that are causing the issue.
P.s the siren noises indicate worn bearings, usually more noticable at low RPM and as the engine is coming back to idle.
-
Yes please that would be great. I would rather check the map first before i refurb the turbo.
Im from leeds in yorkshire. not really any strong sounds except at idle when i rev abit i can hear abit of an faint owl howling.
appreciate the help
-
'Owl howling' is the bearings, but shouldnt cause a limp mode situation unless its really severe.
We dont have anyone in Leeds area, but we are a out 80mins from you so if you fancy a free check of the map, just ask.
-
Thanks alot
Yeah where abouts are you from?
-
Just taken it out now im getting the same readings as the first post, no limp mode though.
It still pulls really fast.
btw the only other error apart from overboost is Egr insufficient flow. I removed it and cleaned egr and cleared. Still same error
Could that be related and they both use a vacuum system and both lead to the same vacuum box
-
The requested boost looks safe IMHO, its the actual boost that high which is not going to be realted to the map as the ecu will go closed loop and try to control the boost to the requested amount. If the ecu cannot control the boost and sees more than 400mb for around 10 seconds it will jump in to limp mode via fuel IQ cut. In most cases to induce 400mb for more than 10seconds you will need to be doing around 60-80mph under full load in 4th-5th ot 6th gear.
Common issues that cause this kind of limp mode would be a sticky VNT, faulty map sensor and/or faulty vacume control box.
If the map was requesting too much boost it would not go into limp mode as the boost would still be within the 400mb factor.
A good high load logging sesion is what is needed, to log the boost v boost control duty cycle.
http://www.mk5golfgti.co.uk/forum/index.php/topic,26004.0.html
-
Thanks nick. So its definately not the remap? i thought so due the actual boost being more than the requested.
If not ill book it in to you guys for a refurb!
I can hear whistling on load and when releasing the throttle
It was done by www.mobileecuremapping.co.uk
Do u think thats def ok nick>
-
OMG Really ANNOYED
Just got a new genuine turbo bolted on and all the whistling has gpne BUT its still got actual boost higher at peak.
It must be the map? please help guys!!???
-
My offer to check over the map is still open:)
-
Thanks, everyone is wary about reading the map for me for some reason =s
I cant beleive its still doing it with a brand new genuine turbo. All the whining has gone now. Im thinking it must be A) map B) Vacuum pipe C) n75 control solonoid
?
-
If the turbo was faulty surely it would under boost not over boost? Why don't you get the people back who done the map to read it, but like someone else said if it was the map surely the ecu would not put it into limp mode as it would think the boost I'd ok?
-
Yeah im going to them today. Does anyone know what the duty cycle should look like when doing a boost log in vagcom
-
Yeah im going to them today. Does anyone know what the duty cycle should look like when doing a boost log in vagcom
The boost control duty is not a set target % its based on PID controllers and pre/post states.
If your getting high % then this is a sign the ecu is asking for less boost and the hardware not responding, due to mechanical faults or leaks.
1st thing to do is make sure the MAP reading are correct and the map sensor not over reading, then do a logging session on the dyno set we at what loads the boost control is out of range, by how much then WHY.
With vagcom and my dyno I can make a visual picture inmy head of whats going on and where we need to start looking at.
We could also restore the ecu back to stock then datalog the ecu.
Nick
-
Hey, how did you solve the problem with the overboost?
was it the remap?
I also have an overboost on my 2.0tdi but no limp mode. it is remaped and pulls very well but I am afraind one day I will pop the turbo.