2005 Audi Allroad rear chain driven 4.2

B6/7 S4/RS4
#1

I bought this car with a check engine light on, I know not a smart move but I could not pass on the chance to own a 4.2 allraod.
http://www.audizine.com/gallery/showfull.php?photo=80380

So I purchased a VCDS cable and found:

Chassis Type: 4B (4B - Audi A6 C5 (1998 > 2006))
Scan: 01 02 03 06 08 15 16 17 18 22 34 35 36 37 45 55 56 57 65 67
75 76 77

VIN: WA1YL64B75N025037

Address 01: Engine Labels: None
Part No SW: 4D0 907 560 DC HW: 8E0 907 560
Component: 4.2L V8/5V G 0010
Revision: 00000000 Serial number: AUZ7Z0D2695394
Coding: 0007755
Shop #: WSC 02334 785 00200
VCID: 6ADBF1D1466D6971D1F-5140

5 Faults Found:
17538 - Fuel Trim; Bank 2 (Mult)
P1130 - 001 - System too Lean
16558 - Fuel Trim; Bank 2
P0174 - 001 - System Too Lean - MIL ON
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 001 -
16685 - Cylinder 1
P0301 - 001 - Misfire Detected
16687 - Cylinder 3
P0303 - 001 - Misfire Detected
Readiness: 0110 1101

I am a shade tree mechanics helper at best, but being a full time architecture student and father of two I need to attempt at least to fix what I can. The car has 124k mile on it so I decided to remove the spark plugs and replace them. This is what I found:

http://www.audizine.com/gallery/showfull.php?photo=78231

All eight looked like this, so i replaced them all as well as the valve cover gaskets and coils. I saw no change. I subsequently replaced the fuel, MAF, and air filter as well as swapped the injectors from L to R. After this I grew frustrated and delivered it to a local shop here in Charlotte that specializes in European cars and has done work for me in the past. They did smoke testing for vacuum leaks, leak down test on each cylinder, replaced a flex joint in the down pipe. There is a slight improvement at idle as it doesn’t quite remind me of my old 69 big block fairlane. Other than that they were as baffled as me and threw in the towel. Here is a video of it running:

https://www.youtube.com/watch?v=-U9JHSsSWqc

Do any of you guys have any ideas? Should I just give in a take it to another shop? Dealer(cringe)? Swap in a 2.7?

Thanks

#2

http://www.audizine.com/gallery/showfull.php?photo=80380

http://www.audizine.com/gallery/showfull.php?photo=78231

#3

The other thing I forgot to mention, the car falls on its face at 50-60 mph in 5th gear (tip), which is approx. 2000 -2150 rpm. At no other speed in that rpm range is there a problem.

#4

One thing I could advise you on is do not take it to Audi Of Charlotte for any type of work! Nice looking Allroad though!

#5

Get a long ball end 5 mm Allen socket and check your intake manifold bolts. Start in the middle and criss-cross your way to the outside edges. The torque spec is 11 Nm.

There was a TSB for the bolts backing out and I have had to fix a lot of B6/7 S4s with that issue.

#6

Well your in the right place.

Mr wrong is seldom wrong and JimmyBones is an audi tech so your going to get the help you need.

To add a few things.

A few questions
Do you have a vag-com if you do clear the codes and tell us how long they take to return or if they return at all. You can clear the codes and check a few min later. But the codes your getting would be codes that would only come back after a little driving.

Your car seems to not be passing several readiness test as well. So we need to start slowly working through all your issues. Follow the first two guys advice and then if you can respond to the few things I posted we can help more if needed

#7

Now this is what I call a signature worth quote! I had a good chuckle there man. I’m starting a new thread lol

#8
#9

If it comes back that quick that sounds like a vac leak or a possible damaged intake manifold. You should be able to see on block 034 what the car is doing for the long term fuel trim. You have to have the car up to operation temp before the data will be accurate. Try looking at the values just after you clear the codes and each time you drive the car just before you shut the car off. Post them here and that will help us sort this out. It’s the first part of the walk through after you check what’s been suggested above

#10

Only 5 Codes… you lucky guy, I’ve got 12 Codes. Good luck, hope you get it worked out.

#11

Well its been a while, I had two bolts strip, one bolt actually broke my socket snapping the tool off in the hex well. So they seemed overly tight. I removed the offending bolts and loosened all the rest, tightened them all finger tight then broke out the torque wrench. Followed the suggested sequence and I am now testing.

I appreciate the help fellers.

#12

you should be in good shape following what jimmyb posted

#13

Yeah I have snapped the ball end of my long allen sockets off a bunch of times, usually it is the 6 mm though.

I said what I did because that should be the cheapest thing to start with. If the fuel trim too lean codes come back then you need to move to checking other vacuum leaks or less likely exhaust leaks.

#14

I drove two 35 mile legs yesterday after clearing the CEL’s, highway(27mi @ 40-75) and city (8mi @ 0-40). The idle is very good, at 45 - 55 it stumbles and is rough but so far no CEL’s.

Someone suggested to me on another forum to check measuring blocks 91 - 92 - 93. I do not know if this helps you guys at all but here it is.


http://www.audizine.com/gallery/data/500/medium/2005_-_4_2_measure_blocks_91-92-93.png

#15

I’ll check this today.

#16

let us know. The other site has guys telling you to do what they read guys here telling people to do. They dont
understand most of the time what to even look at. I would not waste much time over there looking for help

#17

Yes I am becoming aware of the differences between forums. Thanks for all the help! Here are my readings.

Car was brought up to temp, codes cleared and reading taken.

http://www.audizine.com/gallery/data/500/medium/Fresh7-12_34block_read.jpg

Then at shut down

http://www.audizine.com/gallery/data/500/medium/7-13_34-measblock_read.jpg

Next day, car brought to temp and measuring block read

http://www.audizine.com/gallery/data/500/medium/Before_7-13_measblock34.png

20 minutes later at shutdown

http://www.audizine.com/gallery/data/500/medium/After_7-13_measblock34.png

The car is now idling rough until it warms enough to idle down, then it is fine until in gear at 1900-2100 rpm where it is rough again.

#18

ok first looks shows signs of a vac leak as the GPS readings and load is much too high for 650 rpm. After a long drive before you shut the car down grab a shot of block 032.

Just as a FYI these are not logs but simply screen shots. Still thats all we really need with block 032 anyway

#19

Tuesday 14 July 2015 19:43:53:04736-VCID:6ADBF1D1466D6971D0B-5140 VCDS Version: Release 14.10.2 (x64) Data version: 20150311
4D0 907 560 DC 4.2L V8/5V G 0010

Group A:	'034				Group B:	 Not Running				Group C:	 Not Running		
	RPM	Temperature	Lambda Factor	 									
TIME					TIME					TIME

Marker STAMP /min °C STAMP STAMP
0.13 640 440 0.29 Test OFF
0.3 640 440 0.29 Test OFF
0.48 640 440 0.29 Test OFF
0.65 640 440 0.29 Test OFF
0.82 640 440 0.29 Test OFF
0.99 640 440 0.29 Test OFF
1.16 680 440 0.29 Test OFF
1.34 680 440 0.29 Test OFF
1.51 640 440 0.29 Test OFF
1.68 680 440 0.29 Test OFF
1.85 680 440 0.29 Test OFF
2.02 640 440 0.29 Test OFF
2.19 640 440 0.29 Test OFF
2.35 680 440 0.29 Test OFF
2.52 640 445 0.29 Test OFF
2.69 640 445 0.29 Test OFF
2.85 640 445 0.29 Test OFF
3.02 640 445 0.29 Test OFF
3.19 640 445 0.29 Test OFF
3.35 640 445 0.29 Test OFF
3.52 640 445 0.29 Test OFF
3.7 640 445 0.29 Test OFF
3.87 640 445 0.29 Test OFF
4.04 640 445 0.29 Test OFF
4.21 640 445 0.29 Test OFF
4.38 640 445 0.29 Test OFF
4.56 640 445 0.29 Test OFF
4.73 680 445 0.29 Test OFF
4.9 680 445 0.29 Test OFF
5.07 680 445 0.29 Test OFF
5.24 640 445 0.29 Test OFF
5.41 640 445 0.29 Test OFF
5.59 640 445 0.29 Test OFF
5.76 640 445 0.29 Test OFF
5.93 640 445 0.29 Test OFF
6.1 640 445 0.29 Test OFF
6.27 680 445 0.29 Test OFF
6.45 640 445 0.29 Test OFF
6.62 640 445 0.29 Test OFF
6.79 640 445 0.29 Test OFF
6.96 640 445 0.29 Test OFF
7.13 640 445 0.29 Test OFF
7.3 640 445 0.29 Test OFF
7.46 640 445 0.29 Test OFF
7.63 640 445 0.29 Test OFF
7.79 640 445 0.29 Test OFF
7.96 640 445 0.29 Test OFF
8.13 640 445 0.29 Test OFF
8.31 640 445 0.29 Test OFF
8.48 640 445 0.29 Test OFF
8.65 640 445 0.29 Test OFF
8.82 680 445 0.29 Test OFF
8.99 640 445 0.29 Test OFF
9.15 680 445 0.29 Test OFF
9.32 720 445 0.29 Test OFF
9.48 680 445 0.29 Test OFF
9.66 720 445 0.29 Test OFF
9.84 720 445 0.29 Test OFF
10 720 445 0.29 Test OFF

525.38	800	470	0.353	Test OFF									
525.55	800	470	0.353	Test OFF									
525.72	760	470	0.353	Test OFF									
525.88	760	470	0.353	Test OFF									
526.05	680	470	0.353	Test OFF									
526.23	640	470	0.353	Test OFF									
526.4	680	470	0.353	Test OFF									
526.57	640	470	0.353	Test OFF									
526.74	680	470	0.353	Test OFF									
526.91	760	470	0.353	Test OFF									
527.08	960	470	0.353	Test OFF									
527.24	1200	470	0.353	Test OFF									
527.41	1400	470	0.353	Test OFF									
527.59	1320	475	0.353	Test OFF									
527.76	1120	480	0.353	Test OFF									
527.93	1040	480	0.353	Test OFF									
528.1	880	480	0.353	Test OFF									
528.27	800	480	0.353	Test OFF									
528.44	720	480	0.353	Test OFF									
528.6	680	480	0.353	Test OFF									
528.78	760	480	0.353	Test OFF									
528.94	680	480	0.353	Test OFF									
529.1	680	480	0.353	Test OFF									
529.27	680	480	0.353	Test OFF									
545	680	480	0.353	Test OFF
#20

I can do that tomorrow.