Audi S4, A6, A8, Allroad 2.7t fuel trim faults, boost leaks, poor mileage, poor driveability
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- Опубликовано: 17 май 2016
- If your 2.7t is not hitting proper boost levels, transmission is shifting improperly, you're getting rich or lean fuel trim faults, maf failures, oil leaks, or really have almost any check engine light for emissions or failed sensors or catalytic converters the breather system is likely the culprit.
This is how you check it and what to replace. Applicable to all 2.7 turbo engines in the S4, A6, A8, and Allroad.
Excellent video; I think, this info would apply to my 1.8T as well. At 14 years old and almost 100k; I am going through ALL of the boost related hoses and valves, parts that are boost related, on my 2002 New Beetle Turbo S with the 1.8T AWP engine. I've noticed, that allot of the valves; like the DV , N249, N75, etc, are in "soft failure" mode and while they technically "work", they are not up to correct performing levels. This is also, probably why; traditional testing methods, cannot replicate real world scenarios and how things work, in a hot engine. Each part I replaced; the boost increased and smoothed out, the boost flutter and low psi. Thanks for the video; I appreciate more in depth tech like in this video, this is the type of info and observations, that come from working on VW's all the time. Thanks again and keep up the good work! :)
Thank you for that, greatly appreciate the way you took the time to explain everything like if you're talking to someone right in front of you, very helpful I myself have a 2.7 L allroad. 2004, greatly appreciated once again for the explaining that you do, keep it up, very helpful to us. ... please continue explaining on subjects that are Connected to the allroad
That is a great explanation of the impact of positive crankcase ventilation system. I would never have related transmission clutch pack failure to dirty MAF sensor. The importance of regular maintenance ...
One of the best videos Ive seen for these types of vehicles - impressive knowldge, great delivery - kudos.
Wheres your shop?
As all the other comments this is a great explanation of a very confusing and complex system, much better than other explanations, I have made an entirely new spider assy from heat rated silicone hose and reused the factory quick connects, my particular 2.7 was the 230HP model which still had the F hose so i deleted that, I also replaced the one green check valve on top of the intake as that was damaged, still have a massive issue in that the car runs fine, but its way to rich especially at idle, so im guessing vac leak, i have replaced various oe hoses on the system that looked bad but i cannot now find another leak, its very hard to see much of the vac system on this car as its so cramped. Now I have those values you mentioned for the MAF I will at least be able to check them as I fear my MAF may now be reading incorrectly but i also fear this is still down to a leak somewhere, I even did a smoke test and found nothing. DV Valves were also replaced for good oem plastic ones already
Bro where are u located?
Hi, i have a 2011 S4 3.0TSFI with coolant leak which i suspect it is leaking through to the exhaust because it gives a steam exhaust when idling, what could be the problem? Is it a top gasket fail? Spider pipe leak? EGR fail? ... i would like some help before i take it to the specialist.
Ok i have a a6 2.7t 2000 on idle it stall out and wen am driving it stall out any idea
My 2001 S4 recently started loosing boost, also when I throttle it and go up to high rpms my boost goes down to 10 psi and the car starts "stuttering" and rpms raise very, very slow if I try to hold boost at 5psi it just drops, what could it be?
Damn, how did I not find this channel way earlier than now... how many times I searched issues with the 2.7t... never saw any of your vids. No idea why you popped up right away.... very informative and this is the only vid of watched so far. It was from a while ago, but someone’s always going to need help!! Thank you much my man. This is going to be super helpful. I appreciate your time and effort (almost a decade ago) so thank you.
Most informative video I've seen on the subject
I have a 2.7 l -04 allroad. Going to look over all my valves. Thanks. Excellent video. Keep it up.
excellent explanation and I'm sure it's the reason my S4 is throwing the P1127 and P1129 codes...
Wow! Out of the weeks worth of forum searches and still being sooo un-informed, in 20min you gave me a wealth of knowledge about the 2.7T! Thank you very much! Soooo much good info! Idk shit about these cars yet but having this issue.... some sorta over pressurizing, misfire, detonating like behavior above 4k rpm after K04, clutch and gaskets install! So this should help me I hope! 🙏
This was a very helpful video. Thanks for sharing!
Just found this great vid. I am planning on adding an oil catch can to help alleviate these problems in the future.
Perfect video, thanks alot.
You could be an instructor, i subbed!👍👍 i learned more from this short video than years of screwing with motor
Great video ! My 03 a6 2.7T has an oil leak and its getting on the belt and going every were and it doesn't pour out but when driving it leaks a decent amount and seems to be coming from around the valve cover , has 100,800 miles