B6 Audi 1.8T, Hesitation, Detonation Issues

[PMMGTI]

My DD has, for the last 20k miles, been hesitating / surging across the rpm range but with audible detonation/pinging from 3k rpms on up. It feels somewhat like I am lightly lifting of the throttle and then back on.
When lightly accelerating in 1st or 2nd using no more than 20% throttle input, from idle on up to about 4k rpm, the car cyclically surges back and forth ever so slightly; this motion will continue if revs are held in these gears, around 2k-3k. (surging is far less noticeable in higher gears)
Anytime the throttle is applied more than 30% from idle up to 3k-4k rpms this surging is far more erratic, even more so at WOT.
The warmer temps have made this problem worse / more noticeable and annoying.
Sometimes the car will pull great, mostly when colder for one or two shifts, but then revert back the next time. Idle and cruise in 5th gear is smooth. The car is bone stock except for suspension, manual trans.
The following have been changed in the past 10k miles, with no effect on this problem:
- Ign coils
- Injectors
- Coolant sensor
- Front and rear O2
- MAP
- Both Knock sensors
- Various hardlines, vaccum, pcv, checkvalves
- Cleaned TB
- 710 DV
- N75
- Wastegate control
- Timing belt etc
- Plugs
- Copper NGK
- Copper NGK 1 step colder
- NGK Iridium
- NGK Iridium 1 step colder
- Bosch Tri electrode 1 step colder (Current)

She is pulling 6 to 9 degrees at the moment, see logs. ( Marker 1-2 was a 2nd gear pull, 5-6 is 1st through 3rd gear)

I have had some scans which have shown cat efficiency problems, but I have attributed those the pinging etc. The last scan showed a bad secondary O2. The data logs were done with a brand new rear O2

Any advice would be appreciated, thanks.

https://docs.google.com/spreadsheet/...iMzF3MHc#gid=1

Monday,28,May,2012,20:17:16:63223
VCDS Version: Release 11.11.2
Data version: 20120126



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--------------------------------------------------------------------------------


Address 01: Engine Labels: 06B-909-518-AMB.lbl
Control Module Part Number: 8E0 909 518 AF HW: 8E0 909 018 A
Component and/or Version: 1.8L R4/5VT G 0001
Software Coding: 0016701
Work Shop Code: WSC 65728 1018 854933
VCID: 74EDABEC14A00E3
3 Faults Found:

16523 - Oxygen (Lambda) Sensor B1 S2
P0139 - 004 - Response too Slow - Intermittent
17522 - Oxygen (Lambda) Sensor; B1 S2
P1114 - 008 - Internal Resistance too High - Intermittent
16712 - Knock Sensor 1 (G61)
P0328 - 001 - Signal too High - Intermittent

Readiness: 0000 0000




Scan from 20k miles ago

Wednesday,31,August,2011,17:22:10:63223
VCDS Version: Release 10.6.4
Data version: 20110418



--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Address 01: Engine Labels: 06B-909-518-AMB.lbl
Control Module Part Number: 8E0 909 518 AF HW: 8E0 909 018 A
Component and/or Version: 1.8L R4/5VT G 0001
Software Coding: 0016701
Work Shop Code: WSC 65728 1018 854933
VCID: 74EDABEC6E2B
2 Faults Found:

16804 - Catalyst System; Bank 1: Efficiency Below Threshold
P0420 - 002 - Lower Limit Exceeded - Intermittent - MIL ON
16712 - Knock Sensor 1 (G61): Signal too High
P0328 - 001 - Upper Limit Exceeded - Intermittent

Readiness: 0000 0000

[PMMGTI]

....added some more details.

[Jack@European Parts]

You need to post a new current auto-scan of at least 11.3

[PMMGTI]

Jack, i won't be able to that until tonight.
May i ask why? Will a scan with 11.3 reveal any new pertinent information that 11.2 did not...
Respectfully,
Paul

[Jack@European Parts]

First your scan is incomplete.

Two it is not the latest version.

There may be conflicts with other modules in certain circumstances and it helps us help you.

If you knew what you were doing, you wouldn't be here.
Please don't take it upon yourself to edit information we use to help you. Except VIN or IMMO ID, this we understand for identity purposes.
Please dont post links and display text in the forum for logs, because I don't click links.
Also, please post readiness scripts or tests.
It would be helpful.
Post the part # of the plugs you used.
Fuel type?
Tuning?
MAF part # and brand OEM vs AFT?

Please advise because CF like this is bad, especially if you hear it.

[PMMGTI]

Yes, I am not a paid professional when it comes to diagnosing the 1.8T, but this is not my first dance either......I am looking for others' opinions on this not a debate on my opinions of the root cause.

As I said in my original post, the car is bone stock except for suspension and always has been.

The MAF came with the car from the factory. I have cleaned it several times with CRC MAF cleaner and run the car with the MAF disconnected, no effect on this problem.

The air filter is and always has been a paper style....replaced 4 weeks ago.

Fuel is always 93 octane from either my local Shell or Hess station (For at least the last 5 years), which we use to also fill up my wife's Camaro SS and my Porsche....never any issues on those cars, which are octane sensitive.

Plugs
BKR6E
BKR7E
PRF6Q
PRF7B
F6DTC
Visually they are all the same, ever so slight tan on the ceramic and light grey on the electrodes, which is ideal really. Any momentary lean/hot/pinging is likely masked due to the fact that i cruse at about 70 MPH to work and back each day.

Coils
06A905115D

Jack,
How would you like me to post the data logs? I understand your hesitation about clicking links...In the past folks like Dana had encouraged the use of Google Spreadsheets to share data logs etc, hence my posting of said link......

I will get a full scan when time permits, hopefully in the next few days.


Thanks,

Paul

First your scan is incomplete.

Two it is not the latest version.

There may be conflicts with other modules in certain circumstances and it helps us help you.

If you knew what you were doing, you wouldn't be here.
Please don't take it upon yourself to edit information we use to help you. Except VIN or IMMO ID, this we understand for identity purposes.
Please dont post links and display text in the forum for logs, because I don't click links.
Also, please post readiness scripts or tests.
It would be helpful.
Post the part # of the plugs you used.
Fuel type?
Tuning?
MAF part # and brand OEM vs AFT?

Please advise because CF like this is bad, especially if you hear it.

[Jack@European Parts]

Understood.....

I see an effort here.

Please also check the fuel PSI and volume of fuel flow. Please don't forget the regulator and does it mask CF when disconnected because it should by going slightly rich.

The test you have done for the MAF is insufficient.

Please consider swapping or replacement if its original.

Change the OXS sensors ASAP before they wipe out a driver and fuse them for the heater circuit.

Coil pack is latest version but is still a POS.

Consider ground enhancements for each coil back to teh battery x2 per coil and using part # 06B-905-115E Hitachi version.

[PMMGTI]

Fuel pressure last checked about 2 months ago, all within spec. Have not checked flow.
Replaced fuel filter just after....this is a return-less fuel system, regulator is in the FF.
Rear Ox was replaced yesterday and the one it replaced was the original from factory. The front was new 10K ago and is a bosch direct replacement wide-band.

I guess a new MAF is in order.

Will work on the rest.....

[Jack@European Parts]

Or fuel pump or filter again due to bad internal regulator.

There were many issues.

I would say the MAF is a good start.

Also see what requested boost is vs actual in a log during CF issue to determine WG function proper.

[PMMGTI]

Fuel pump is possible, but pressures were good, with both fuel filters.
If you dare look at my data log link you will see MAF, Boost, timing pull etc.
The boost looks close, no major lag or any spikes. The MAF g/s maxed out at about 147 in 2nd and 3rd. Based on the 80% rule it should be about 135 or higher.
The Lambda % did flip-flop around between -4 and +5, on average.....that doesn't seem all that bad.

I am looking for a logical approach to fixing this problem, I am not looking to just change all the suspect parts out.
Please look at my data log and let me know what you think...


Radio was changed out for an aftermarket about 3 months ago....

Tuesday,29,May,2012,18:31:23:63223
VCDS Version: Release 11.11.3
Data version: 20120401



--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Chassis Type: 8E - Audi A4 B6/B7
Scan: 01 02 03 08 09 0F 11 15 16 17 18 36 37 45 46 55 56 57 65 67
69 75 76 77

VIN Mileage: 240000km/149129miles
-------------------------------------------------------------------------------
Address 01: Engine Labels: 06B-909-518-AMB.lbl
Part No SW: 8E0 909 518 AF HW: 8E0 909 018 A
Component: 1.8L R4/5VT G 0001
Coding: 0016701
Shop #: WSC 65728 1018 854933
VCID: 74EDABEC14A00E9

1 Fault Found:
16804 - Catalyst System; Bank 1
P0420 - 002 - Efficiency Below Threshold - Intermittent
Readiness: 0000 1000

-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 8E0-614-517.lbl
Part No: 8E0 614 517 H
Component: ABS/ESP allrad 2328
Coding: 04275
Shop #: WSC 06435
VCID: 2D5B7E88E70A1F1

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC Labels: 8E0-820-043.lbl
Part No: 8E0 820 043 L
Component: A4 Klimaautomat 1116
Coding: 00000
Shop #: WSC 06435
VCID: 2A517594D6E4089

1 Fault Found:
01810 - Actuating Motor for Temperature Flap; Right (V159)
41-10 - Blocked or No Voltage - Intermittent

-------------------------------------------------------------------------------
Address 09: Cent. Elect. Labels: 8E0-907-279-8E2.lbl
Part No: 8E0 907 279 E
Component: int. Lastmodul USA 0305
Coding: 00003
Shop #: WSC 06435
VCID: 346D6BEC04204E9

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags Labels: 8E0-959-655-84.lbl
Part No: 8E0 959 655 C
Component: Airbag 8.4EP 2000
Coding: 0010607
Shop #: WSC 06435 000 00000
VCID: 37775CE04556A51

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel Labels: 8E0-953-549.lbl
Part No: 8E0 953 549 N
Component: Lenksáulenmodul 0308
Coding: 00042
Shop #: WSC 06435
VCID: 3E7949C43A6C949

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments Labels: 8E0-920-9xx-8E2.lbl
Part No: 8E0 920 950 L
Component: KOMBI+WEGFAHRS. RB4 D36
Coding: 03200
Shop #: WSC 00001
VCID: 32616DF4FE34409
WAUVC68E13A305132 AUZ6Z0B0333036

2 Faults Found:
01176 - Key
07-10 - Signal too Low - Intermittent
01304 - Radio
49-00 - No Communications

-------------------------------------------------------------------------------
Address 46: Central Conv. Labels: 8E0-959-433-MAX.lbl
Part No: 8E0 959 433 BB
Component: Komfortgerát T7B 1311
Coding: 12140
Shop #: WSC 06435
VCID: 72E1ADF43EB4009

Subsystem 1 - Part No: 8E1959801
Component: Tõrsteuer.FS BRM 0002

Subsystem 2 - Part No: 8E1959802E
Component: Tõrsteuer.BF BRM 0002

Subsystem 3 - Part No: 8E0959801A
Component: Tõrsteuer.HL BRM 0003

Subsystem 4 - Part No: 8E0959802A
Component: Tõrsteuer.HR BRM 0002

4 Faults Found:
00962 - Alarm via. Tilt Sensor
35-00 - -
01572 - Alarm triggered by Door Contact Switch; Passenger Side
35-00 - -
01573 - Alarm triggered by Door Contact Switch; Left Rear
35-00 - -
01333 - Door Control Module; Rear Left (J388)
80-10 - Single-Wire Operation - Intermittent

End ---------------------------------------------------------------------

[PMMGTI]

....Also I have had my Vag-Com cable, purchased from Ross-Tech, since 2005.

[mike321]

Exhaust could be blocked due to a broken down converter.

What are your live data readings for the o2 sensors telling you?

[PMMGTI]

Exhaust could be blocked due to a broken down converter.

What are your live data readings for the o2 sensors telling you?

Which blocks are you referring to, adaptation? Did you look at my data log link from the first post?

What is your theory on why a clogged cat would cause hesitation and pinging?

[mike321]

The measuring blocks,there you can see if your o2 sensors are working properly,

A block cat will prevent your engine from releasing the burned exhaust fumes,thus,causing a major loss in power.

[PMMGTI]

The measuring blocks,there you can see if your o2 sensors are working properly,

A block cat will prevent your engine from releasing the burned exhaust fumes,thus,causing a major loss in power.

Yes, the measuring blocks, and readiness codes, show that they are functioning. There is a code stating cat inefficiency though...... often misfires / pinging can set this code.
I don't have power loss, sometimes she pulls very very well all the way thought the rev range, it is random hesitation and surging. If it was clogged I would expect it to be glowing after use and a definite loss of power up high in the RPM's
I will add the cat to my list of things to inspect/replace.

Thanks for your input.

[Jack@European Parts]

I agree the cat could be suspect as a result due to being damaged in random condition way of being collapsed or broken physically causing the sporadic behavior.

This I consider an effect of a MAF or false air leak maybe even through combi circuit yet to be verified.

No I'm not looking or daring to click on links here.

[PMMGTI]

Jack, you have yet to answer my question......how should i go about getting these data logs to you?

Do you suggest running an adaptaion in block 074 for the combi verification?

[Jack@European Parts]

Post them here in TXT.

They should be for everyone to see.

[PMMGTI]

Not having any luck getting this to format no matter what method I use.
Any tricks to getting column format to stick in this forum?.....though you will be able to copy and paste as text in Excel.


2nd gear log
Engine Speed - (G28) Lambda Control - Bank 1 Mass Air Flow - (G70) Intake Air - Temperature (G42) Timing Retardation - Cylinder 1 Timing Retardation - Cylinder 2 Timing Retardation - Cylinder 3 Timing Retardation - Cylinder 4 Lambda Control - Bank 1 (actual) Lambda Control - Bank 1 (specified) Boost Pressure - (specified) Boost Pressure - (actual)
/min % g/s °C °KW °KW °KW °KW actual specified specified mbar actual mbar
2000 -2.3 23.83 48 0 0 0 0 1.016 1 1710 1070
2120 1.6 35.42 48 0 0 0 0 0.977 1 1950 1160
2240 0 38.83 46 0 0 0 0 0.969 0.953 1940 1260
2360 -0.8 45.17 45 0 0 0 0 0.945 0.953 1920 1350
2520 -0.8 52.61 45 0 0 0 0 0.93 0.945 1880 1470
2680 -2.3 62.28 45 0 0 0 0 0.945 0.945 1850 1630
2880 -3.1 78.25 45 0 0 0 3 0.961 0.938 1850 1830
3080 -1.6 94.72 44 0 0 0 3 0.938 0.938 1870 1990
3280 -1.6 102.69 44 0 0 0 3 0.938 0.938 1870 2060
3520 -1.6 101.25 43 0 0 0 3 0.93 0.93 1860 1910
3720 -2.3 100.47 43 0 0 0 3 0.922 0.93 1860 1870
3920 -3.1 106.89 43 0 0 0 3 0.945 0.93 1850 1860
4120 -0.8 111.33 43 0 0 0 3 0.938 0.922 1850 1840
4320 0 116.19 43 0 0 0 3 0.922 0.922 1850 1820
4520 0 122.03 43 3 3 0 2.3 0.93 0.922 1860 1840
4720 0 129.31 44 3 5.3 3 5.3 0.914 0.922 1860 1830
4920 -0.8 135.89 45 6 5.3 6 7.5 0.922 0.914 1860 1810
5120 0 139.89 45 6 5.3 9 7.5 0.883 0.844 1830 1810
5320 1.6 145.25 45 6 5.3 9 7.5 0.789 0.797 1810 1740
5480 1.6 145.58 46 6 5.3 9 7.5 0.743 0.758 1810 1710
5680 1.6 144.56 48 6 5.3 9 7.5 0.743 0.743 1790 1690
5800 0.8 148.39 48 6 5.3 9 7.5 0.735 0.735 1780 1670
5960 0.8 147.42 50 6 5.3 9 7.5 0.735 0.727 1760 1630
6120 0.8 146.22 51 6 5.3 9 7.5 0.735 0.719 1750 1630
6240 0.8 147.64 51 6 5.3 9 7.5 0.727 0.774 990 1600
6080 0 8.89 52 0 0 0 0 0.805 0.945 990 1190
5760 0 15.22 51 0 0 0 0 0.914 0.961 990 1110
5280 -3.1 14.56 51 0 0 0 0 1 0.961 990 1070
4000 0 9.89 51 0 0 0 0 1.991 1.047 990 1050
4040 0 10.39 51 0 0 0 0 1.991 1.047 990 1040
4000 0 10.58 51 0 0 0 0 1.991 1.047 980 1030
3960 0 10.56 51 0 0 0 0 1.991 1.047 980 1030
3880 0 10.53 51 0 0 0 0 1.991 1.047 980 1030

1st thru 3rd log


760 -6.3 8.28 54 0 0 0 3.8 0.992 1 1080 990
1080 0 13.17 54 0 0 0 3.8 0.938 1 1410 980
1680 0 24.58 54 0 0 0 1.5 0.969 1 1810 1010
2000 0 30.44 54 0 0 0 0 0.984 0.938 1920 1090
2400 0 39.61 53 0 0 0 0 0.938 0.938 1900 1200
2400 0 41.72 53 0 0 0 0 0.922 0.938 1890 1300
2120 -0.8 38.47 52 0 0 0 0 0.953 0.93 1690 1350
2240 -0.8 43.89 51 0 0 0 0 0.945 0.922 1860 1410
2520 -0.8 51.53 51 1.5 1.5 1.5 0 0.93 0.922 1790 1530
2920 -1.6 72.89 51 0.8 3 0 4.5 0.93 0.922 1790 1770
3360 -1.6 94.89 51 0.8 3 0 3.8 0.906 0.922 1820 1830
3880 -3.1 104 51 6 6 5.3 7.5 0.93 0.922 1820 1840
4320 -2.3 113.53 51 6 6 5.3 7.5 0.938 0.914 1820 1780
4840 0 127.94 51 5.3 6 5.3 6.8 0.914 0.914 1810 1730
5400 -0.8 138.14 51 5.3 5.3 5.3 6.8 0.914 0.899 1770 1660
5840 0 142.86 51 5.3 5.3 4.5 6.8 0.883 0.852 1660 1590
6240 0.8 99.39 51 0 0 4.5 6 0.727 0.805 990 1520
6120 0 7.86 52 0 0 0 0 0.875 0.938 1620 1000
5880 0 107.89 51 3.8 3.8 3 4.5 0.891 0.906 1820 1560
4080 0 113.78 51 3 3 3 6 0.906 0.867 1840 1920
4120 1.6 111.61 53 3 3 3 6 0.821 0.828 1830 1880
4400 0 113.81 53 3 3 2.3 6 0.797 0.797 1820 1800
4560 -0.8 117.06 54 3 3 2.3 6 0.789 0.789 1820 1770
4760 -0.8 122.89 54 2.3 3 2.3 6 0.789 0.782 1820 1800
4960 -0.8 131.03 55 2.3 3 2.3 6 0.782 0.774 1810 1810
5160 -0.8 137.78 56 2.3 3 2.3 6 0.774 0.766 1790 1800
5360 -0.8 141.06 57 2.3 3 2.3 6 0.735 0.75 1770 1750
5520 -0.8 143.36 57 2.3 3 2.3 6 0.735 0.743 1760 1710
5640 -0.8 143.58 58 2.3 3 2.3 6 0.735 0.743 1760 1680
5800 -0.8 143.36 59 2.3 3 2.3 6 0.735 0.743 1750 1650
5960 -0.8 144.78 60 2.3 3 2.3 6 0.735 0.743 1720 1640
6120 -0.8 145.47 61 2.3 3 2.3 6 0.735 0.766 990 1670
6080 0 6 61 0 0 0 0 0.735 0.891 1660 1100
5160 0 106.31 60 0 0 0 3 0.867 0.914 1780 1620
4240 0 101.42 61 3 3 0 2.3 0.899 0.883 1810 1860
4280 0 112.56 62 3 3 3 4.5 0.875 0.844 1810 1890
4360 0.8 113.86 63 3 3 3 4.5 0.821 0.828 1810 1820
4480 -0.8 110.31 63 3 3 3 4.5 0.821 0.813 1810 1770
4560 -0.8 110.75 63 3 3 3 4.5 0.828 0.813 1800 1800
4640 0.8 113.83 63 3 3 3 4.5 0.813 0.805 1810 1800
4720 0.8 120.36 63 3 3 3 4.5 0.797 0.797 1810 1830
4800 0 122.89 64 3 3 3 4.5 0.782 0.789 1800 1790
4880 0 127.03 64 3 3 3 4.5 0.782 0.782 1810 1790
5000 0 129.39 66 3 3 3 4.5 0.774 0.774 1800 1770
5080 0 131.47 66 3 3 3 4.5 0.774 0.774 1790 1800
5200 0 134.36 66 3 3 3 4.5 0.766 0.758 1780 1770
5240 0 137.58 66 3 3 3 4.5 0.743 0.75 1770 1770
5320 0 135.31 66 3 3 3 4.5 0.743 0.75 1760 1760
5400 0 140.86 67 3 3 3 3.8 0.743 0.75 1760 1760
5480 0 143.78 67 3 3 3 3.8 0.735 0.743 1750 1750
5560 0 143.14 67 3 3 3 3.8 0.735 0.743 1740 1720
5640 0 144.17 67 3 3 3 3 0.735 0.743 1740 1720
5720 0 140.78 68 3 3 3 3 0.735 0.743 1730 1720
5800 0 143.58 68 2.3 2.3 3 3 0.735 0.743 1730 1690
5880 0 145.75 68 2.3 2.3 3 3 0.735 0.743 1730 1690
5920 0 144.56 69 2.3 2.3 2.3 2.3 0.735 0.743 1720 1670
6000 0 145.03 69 1.5 1.5 2.3 2.3 0.727 0.743 1710 1650
6040 0 147.19 69 1.5 1.5 2.3 2.3 0.735 0.743 980 1640
6080 0 86.92 69 0 0 0 0 0.727 0.836 980 1380
5880 0 12.14 68 0 0 0 0 0.836 0.961 980 1150
5600 -3.9 15.06 66 0 0 0 0 0.945 0.961 980 1090
5200 -3.9 12.89 66 0 0 0 0 1 0.969 980 1070
3840 1.6 9.81 64 0 0 0 0 0.961 0.969 980 1050
3680 -0.8 9.81 64 0 0 0 0 0.977 0.969 980 1040
3600 0.8 9.25 63 0 0 0 0 0.969 0.969 980 1030
3480 2.3 8.94 63 0 0 0 0 1 0.969 980 1020
3280 5.5 8.67 63 0 0 0 0 0.977 0.969 980 1020

[Jack@European Parts]

I don't know sure looks like its not stock with request in first log above 1800Mbar.

This car also requires a firmware update, just realized.

[PMMGTI]

The AMB Audi 170hp engine has a K03s and has a stock boost pressure of. 8 Bar.....it is stock, as the 1800mBar indicates.
What do you think about the rest of the data?
What will a firmware update do for me?

Thanks

[Jack@European Parts]

No sir you requested 1950

2120 1.6 35.42 48 0 0 0 0 0.977 1 1950 1160
2240 0 38.83 46 0 0 0 0 0.969 0.953 1940 1260


I think I'm done here.

[PMMGTI]

No sir you requested 1950

2120 1.6 35.42 48 0 0 0 0 0.977 1 1950 1160
2240 0 38.83 46 0 0 0 0 0.969 0.953 1940 1260


I think I'm done here.

Why would the system request 13.7 psi at that RPM, but only ask for <=11.6 PSI everywhere else? If MY car had been secretly tuned without my knowledge, I hope they would have tuned in more than 2 psi at only 2200 RPM's........

Why would you say you are "done here" because of 2 slightly out of spec points on a log???
You're not flaking-out because you can't figure this out are you?? JK.

[PMMGTI]

....What will a firmware update do for me?

[Jack@European Parts]

Actually, I know exactly what it is.

Those are not logs being off on the request end.

Now I'm gonna get vague.

A firmware update will update the software flash with the current required data.

Inconsistent.

[PMMGTI]

Vauge, that is an understatement .... I think i am going to need a translator for that one!

What else do you think?

Actually, I know exactly what it is.

Those are not logs being off on the request end.

Now I'm gonna get vague.

A firmware update will update the software flash with the current required data.

Inconsistent.

[blazerpounds]

Have you changed the fuel pressure regulator? They're cheap enough to try, that's almost what it feels like to me.

[PMMGTI]

As i mentioned above the fuel filter has been changed; pr is in the ff on these returnless systems. Also the fuel trims indicate fuel is sufficient.
Thanks for your input.

Have you changed the fuel pressure regulator? They're cheap enough to try, that's almost what it feels like to me.

[Jack@European Parts]

Boost request at 1950 vs actual of 1160 LOL your killing me.

Your tuned with something you dope, cause you would get a code for more than 200 MBAR deviation.

You have much more then that.

Now everyone, vogue instead. You'd better strike a new pose! Make that car move to the music.
VCDS diagnostics thats what its for. ya ya ya!

http://www.youtube.com/watch?v=jjOLh2s-o3M

[PMMGTI]

......Yeah yeah yeah, its obviously a conspiracy
Other tex'ers did warn me.....its my own fault.
Thanks for all your "help"?.........

Sorry don't know what that link is about, I don't click links on here......

Your tuned with something....

[Jack@European Parts]

No conspiracy, now you sound like the warden in shaw-shank, just the facts based on your Lincoln log Ruth bar posted.

http://www.youtube.com/watch?v=SlKZujGZi0I

Oh that last link was Madonna doing Vogue!

Its not a two way street here.

Go on!
So explain the deviation?

[PMMGTI]

LOL, and you sound like the man who knew to little...... As i said, there is no tune, never has been....explain the other 2 dozen non-deviations. Your lack of logic flow and thought process is stunning.
And hell yeah it's a two way street, this is mmerica boy! Go practice your people skills else where.

Thanks

[Jack@European Parts]

Nope ah ah. I have no people skills. Don't care!

Explain why you get no deviation codes first then.

You do need a firmware update.

I bet the diverter or reversed vac/boost line, waste-gate or N75 something is lazy there for sure.

I would still suspect a MAF and a cat as a result could also be playing boost issues, but it shouldn't be requesting this much boost I believe.

Pre screen for air box clear?

Maybe you just use cheap quality gas.

[Novo1.8T]

The logs you posted look pretty clean from what I can tell, as for the deviation of specified versus actual boost pressure, as soon as you go from cruising to full throttle, the ECM wants to see full boost as quick as possible, but turbo lag is present even in a stock vehicle, so it won't happen instantaneously.

2000 -2.3 23.83 48 0 0 0 0 1.016 1 1710 1070 <----Full throttle applied
2120 1.6 35.42 48 0 0 0 0 0.977 1 1950 1160 <----Begin turbo lag
2240 0 38.83 46 0 0 0 0 0.969 0.953 1940 1260
2360 -0.8 45.17 45 0 0 0 0 0.945 0.953 1920 1350
2520 -0.8 52.61 45 0 0 0 0 0.93 0.945 1880 1470
2680 -2.3 62.28 45 0 0 0 0 0.945 0.945 1850 1630
2880 -3.1 78.25 45 0 0 0 3 0.961 0.938 1850 1830 <----End tubo lag


Also why the numbers deviate when lifting off the throttle slightly when shifting

5800 -0.8 143.36 59 2.3 3 2.3 6 0.735 0.743 1750 1650
5960 -0.8 144.78 60 2.3 3 2.3 6 0.735 0.743 1720 1640
6120 -0.8 145.47 61 2.3 3 2.3 6 0.735 0.766 990 1670 <----Lift off throttle to shift
6080 0 6 61 0 0 0 0 0.735 0.891 1660 1100 <----Back on the throttle
5160 0 106.31 60 0 0 0 3 0.867 0.914 1780 1620
4240 0 101.42 61 3 3 0 2.3 0.899 0.883 1810 1860
4280 0 112.56 62 3 3 3 4.5 0.875 0.844 1810 1890

Lots of deviation there too, but most likely normal, where these logs you posted when the engine was actually doing the surging?

Never any misfire faults? How do your fuel trim values look after driving for awhile or when the surging problem is happening the worst? You said in your first post you already replaced Various hardlines, vaccum, pcv, checkvalves I've seen some problems like this caused by PCV systems so just wondering what all was replaced.

[Jack@European Parts]

Master Nova

He says its stock.

Base max Mbar boost request shouldn't be above 1800 Mbar on a 170HP I believe.