Just bought an 00 A6 2.7T ... stock.. but awesome acceleration.. when it works
Under full load, the car performs badly about 80% of the time. This manifests itself in all sorts of interesting ways. (Problem is semi intermittent)
Off the line, regular city driving, works great.
Off the line, full hard acceleration, pulls perfect in 1st and 2nd gear, but shifting is often harsh. In 3rd/4th (120-130 kph) gear, car gets to maybe 4K rpm, and that all it will do, unless u slack off the petal, and leave it about 1/3 way down and accelerate more gradually and it works fine. If you kick the car down at highway speeds, it may downshift harshly, then gets to 4K and thats about it. Engine seems to pulse, jerks, transmission bucks. Its hard to tell if the car is misfiring, could be, but its more like there is just no power.
I have taken it into Audi, they said its the MAS (Mass Airflow Sensor) (Cost $108, 1/2 hr to replace) I bought the sensor myself, installed it in 5 mins.. no change in the problem (part is non returnable) To try and diagnous the problem, I unplugged the MAS... totally different car. The car does not have the same performance, but it shifts beautifully, no problems with it loosing power at 4K rpm, and no jerks in the shifting or the engines performance. (other than its about 30% less power than when its working correctly)
Any ideas? I would seem to be a MAS related problem. I guess its possible I got a bad MAS from Audi, but I think thats unlikely.
Thanks for the help.
< Message edited by FootIntheGrille -- 4/10/2005 9:14:52 AM >
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Sounds like MAF/S. I'd have the car VAGed to be sure what error codes have developed.
Have a OBDM code reader myself, it comes up with nothing.. other than
P0300 - Misfire detected P1606 - ABS ECU Failure
I know about the P1606 and its going in for repair next week
If I disconnect the MAF, I get a P0102 thrown (MAF voltage too low or something like that.)
the P0300 makes sense, but it does not indicate why. as I said, I HAVE already put a new MAF in and its still the same. Audi said that a MAF can fail and have no code thrown, but I am not so sure. My luck with dealers has never been good, I found today nobody does diagnosis, they just do part replacement at best. My Mercedes is the same way, fricking waste of time to take it into a dealer unless I am ready to spend insane quantities of money to have them try and find the problem.
Anyone know of any GOOD places to take an Audi in Toronto area? Down Town fine cars are friendly.. but not sure they are knowledgeable.
Just curious, is there anything else I need to do when I replaced the MAF? I just disconnected the old one, inserted and clamped the new one in. Cleared the code from the ECU. I have been reading about guys that 'reset' the ECU by disconnecting the battery. Is this the same as using the OBDM reader to clear the codes?
No, it is the rubber boot that attaches the two intercooler hoses to the throttle body. Undo the front engine cover (one shaped like a triangle) and the boot is directly below. It will have the boost sensor placed on top. You should remove the TBB and inspect it for tears, usualy where the clamps are fitted. Good luck and keep us posted.
Checked the boot tonight.. large tear alongside the clamp, likely about 1/2 of the boot is ripped... the pipe pushes in past the rip, but likely under full boost pressure it leaks. Called Audi, they have one in stock for $20 CND. Looks like it should take 15-20 mins to replace. Will pick up the part and replace it tomorrow. Will let u know how it goes.
All of TBB's failures I heard of where caused by the clamps. Make sure that the new TBB is a 356T. It replaced the old one( 356N I think) While you are at it, try to find better clamps.
Installed the boot last night... 20 mins work, would have been nice if Audi would have included the clamp for the boost sensor seeing as how the factory one isn't reusable.
Car now performs like it should. No sudden power drop offs, transmission shift smooth. Was a bit suprised about the car's acceleration around 130 km/h, seems to taper off alot more than I expected, my Talon used to do that but at 160 km/h. but will take it out and play with it more when I get a nice stretch of highway.
Might have to do something about the suspension... way to 'spongy' in the corners given the performance the car is capable of. Its just got the stock suspension, not the sport. (Notice it most on on-ramps with the body roll)
Anyway, Thanks for all your help. I am sure I will have more questions as I keep the car.
I was experiencing the same problems. I got under the hood to check the TBB and I found that the right intercooler hose was not all the way in and was covered with dirt. The left one was clean and all the way in. I cleaned of off the hose, pushed it all the way in. It runs perfect now!!
Thanx! Bird
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2001 A6 2.7T Quattro, Black on Black, Premium Sound, 35/20% tint
I too had the same problem with the TBB, big tear around the clamp, I replaced it with a new one and this seemed to fix it for a couple of weeks, but now the boost seems to be very intermitent, I have checked for error code via VAG-COM but there do not seem to be any on the engine.
Some times the car goes like it used to, most of the time it does not seem to spool properly i.e 70% boost.
I have had the DV replaced with forge ones, I have check the vacuum hoses around them, the only problem I could find is when blowing down the dv vacuum hose both disconnected and one sealed I could hear air escaping from the metal pipe work but i cannot pin point it.
I cannot find the f-hose that people go on about although it is a 2001x pre face lift model and i have read somewhere that post 2000 models do not have one, well i cannot find it in the right place the s4's is.
Quick question with the DV should the vacuum hose be coming out on the side or facing up ??
Any help would be good before I check it into the garage.....
Same issues here, replaced tbb and all was well for 2 weeks, now I am getting intermittent spool, i.e 70% most of the time 100% some of the time, dv replaced Forge, maf replaced, before tbb boot split error codes, check vacuum hoses cannot find much,
DV vacuum hoses if disconnected and seal one end I can hear air escaping from what looks like the metal pipe work cannot pinpoint it though.
Any help would be appreciated.
Quick question should the vacuum hoses from the DV's be upright or side ways entry, he garage had them upright stretching the pipe, I looked at the platic originals and they where sideways, the firge dv's look the same as the original ones with the piston position,
im having similar intermittent boost issues! but it gets worse.ive changed the damaged tbb, replaced the clamps with updated units. boost issue seems fine. the new dilemna is, every once in a while, the epc light on the dash wont come on when i turn the key on, and the car will just crank over. i let it sit and eventually, usually at least half an hour , the light comes on and it starts and runs fine.happens very randomly but appears to be getting worse, and ideas?
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2000 a6 2.7t quattro, giac chip, 19x9 projekt zwo front, 19x10 projekt zwo rear, 235/35/19 front, 265/30/19 rear, tiptronic auto, blow off valves vented to atmosphere
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Strange Acceleration Issue - 2.7t - 
