As described to me by Audi dealer -
'Car seems to be badly underboosting rebook for further investigation into N75 solenoid and vacuum pipes'
Week beforehand I did 2300 miles to the ring and back and car was fine/fantastic, goes in for an oil services and now, I've been told and it feels as well, like it is way down on power.
Where are these tubes/valve and what might this imply?
Is the car good for a long journey if I take it easy? or should I find a hire car (2x300miles) over this weekend.
Car underboosting
RE: Car underboosting
A number of things may have gone wrong?
How old is your car? And whats the mileage on it?
Your MAF could have gone. Happened to me recently. It doesn come up under a fault code diagnosis.
The car is perfect for long journeys. Thats what it is built for mate. But it may be under constant boost, they may have already been something wrong before hand, but was small, like maybe a boost leak, that has got worse since under constant pressure.
Your best bet is to go to MRC. (www.MRCtuning.com) they will test your car, do a full health check and tell you whats what and fix the problem. Youre better off going to them than audi mate. Seriously. Youll be sorted.
Is your car making any noise when you press on the pedal? like theres surplus air coming out like when you fill up air on a tyre?
How old is your car? And whats the mileage on it?
Your MAF could have gone. Happened to me recently. It doesn come up under a fault code diagnosis.
The car is perfect for long journeys. Thats what it is built for mate. But it may be under constant boost, they may have already been something wrong before hand, but was small, like maybe a boost leak, that has got worse since under constant pressure.
Your best bet is to go to MRC. (www.MRCtuning.com) they will test your car, do a full health check and tell you whats what and fix the problem. Youre better off going to them than audi mate. Seriously. Youll be sorted.
Is your car making any noise when you press on the pedal? like theres surplus air coming out like when you fill up air on a tyre?
Car is preface lift 99T, just under 99k, no apparent extra sucking / air noises coming from it, though I might open then bonnet at the same time as pressing the throttle to listen again. (I am sure the vacuum pipes were a recall issue were they not?)
I would love to be able to get to MRC but they are simply too far away to just pop over and besides with the Easter weekend I need to know if the car can make a journey ok right now as there is going to be nowhere open to fix it until Tuesday. I don’t want to make a journey for the sake of a £75 on a hire car only to cause significant damage to something (turbos…)
What bugs me slightly, and I don’t know how I could prove it, is that full power was definitely there before it went into the dealer, unless it failed in the two days beforehand. Since getting back from the ring trip (where as I said there was definitely full power available) it had done no more than 50 miles back and forth from work before it had the service and due to the short nature of the journey it only ever gets light throttle pressure during that time. I’ll try and argue that with them, but I am not hopeful…
I would love to be able to get to MRC but they are simply too far away to just pop over and besides with the Easter weekend I need to know if the car can make a journey ok right now as there is going to be nowhere open to fix it until Tuesday. I don’t want to make a journey for the sake of a £75 on a hire car only to cause significant damage to something (turbos…)
What bugs me slightly, and I don’t know how I could prove it, is that full power was definitely there before it went into the dealer, unless it failed in the two days beforehand. Since getting back from the ring trip (where as I said there was definitely full power available) it had done no more than 50 miles back and forth from work before it had the service and due to the short nature of the journey it only ever gets light throttle pressure during that time. I’ll try and argue that with them, but I am not hopeful…
It is hard to say when the problem started and difficult to argue a case against the dealership until you know what the fault is.
You will need a pressure test to find boost leaks, which is the most likely cause of it being down on power.
If you drive it gently (off boost) then it should be OK until you can get it checked out. Best advice is to park it up but that may not be practical.
A trip to a tuner is the best bet overall. They will find and fix the problems quickly.
Best of luck with it.
You will need a pressure test to find boost leaks, which is the most likely cause of it being down on power.
If you drive it gently (off boost) then it should be OK until you can get it checked out. Best advice is to park it up but that may not be practical.
A trip to a tuner is the best bet overall. They will find and fix the problems quickly.
Best of luck with it.
VAGCom logs would prove very usefull, guessing you don't have them. Try VAGCom register or post your rough location and someone on the forum may be able to help.
99 Ming Saloon, Tanoga S/S, De-cat APR D/Ps, Miltek catback, Forge DVs, RS4 suspension, K04s, I/Cs, MAF, Clutch, injectors, oil cooler, airbox, Y pipe, spark plugs, front brakes, Vast EFK, Walbro fuel pump, MRC custom tune, 18" B7 RS4 reps, Kumho tyres
Spoken to mechanic who worked on the car, sounded very knowledgeable. Told me not to worry, car will just feel underpowered.
For information the N75 solenoid measures the boost pressure, feeding it back to the ECU, in this instance there will be a small leak somewhere to the solenoid (in the vacuum pipe) which means it is reading incorrectly and hence the ECU cuts the fuel as a precaution. You can drive the car like this for as long as you like, and it won't cause problems. phew! Just won't go quite so quickly
Will get it fixed when back home again, thanks for help tho!
For information the N75 solenoid measures the boost pressure, feeding it back to the ECU, in this instance there will be a small leak somewhere to the solenoid (in the vacuum pipe) which means it is reading incorrectly and hence the ECU cuts the fuel as a precaution. You can drive the car like this for as long as you like, and it won't cause problems. phew! Just won't go quite so quickly
Will get it fixed when back home again, thanks for help tho!
Tricky, have you tried the rs246 vag-com register?
There must be someone near you that can spare an hour or so .... http://www.frappr.com/vagcomuk/map
There must be someone near you that can spare an hour or so .... http://www.frappr.com/vagcomuk/map
https://www.speedcams.co.uk
B5 2.7t S4 - gone
B5 2.7t RS4 - gone
Ed 30 Golf DSG - gone
A5 3.0tdi - gone within 12 months!
S3 2.0 tfsi - 6+ years, but now sold
2018 Golf R 7.5
B5 2.7t S4 - gone
B5 2.7t RS4 - gone
Ed 30 Golf DSG - gone
A5 3.0tdi - gone within 12 months!
S3 2.0 tfsi - 6+ years, but now sold
2018 Golf R 7.5
I will have a look when I get back, got to set off now, but thanks for the linkNige_S4 wrote:Tricky, have you tried the rs246 vag-com register?
There must be someone near you that can spare an hour or so .... http://www.frappr.com/vagcomuk/map
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