Lambda Fault?

[flooky]

Is there a way of finding out im my lambda sensor is gone using VAG-COM?

The car has just passed the MOT without any problem and when I checked for any faults and there was 1 leak in the system. Rendiness (how ever it spelt) came up with all ok and no faults but now tonight I checked it again and the lambda, cat and summit else is not responding?

Would there be anywhere on VAG-COM to show what it's reading and what it's ment to be?

 

[flooky]

Here are my readings for my MAF tho im not sure what it should be reading?

Wednesday,17,January,2007,12:47:35
6K0 906 032 ,,1.8L R4/20VT SEA 0002,

,Group A:,'002,,,,Group B:, Not Running,,,,Group C:, Not Running,,RPM,Load,Inj. On Time,Mass Flow,,,,,,,,,,
,TIME,,,,,TIME,,,,,TIME,,,,
MARKER,STAMP, /min,%, ms, g/s,STAMP,,,,,STAMP,,,,

,0.01,840,18.0,2.46,3.03,,,,,,,,,,
,0.59,840,18.0,2.46,2.94,,,,,,,,,,
,1.21,1040,45.9,7.38,11.33,,,,,,,,,,
,1.83,1760,51.9,7.38,18.22,,,,,,,,,,
,2.47,1920,54.9,8.20,21.75,,,,,,,,,,
,3.14,2240,59.4,9.43,27.33,,,,,,,,,,
,3.73,3080,61.7,9.43,37.89,,,,,,,,,,
,4.31,3880,65.4,9.84,49.11,,,,,,,,,,
,4.90,4760,71.4,11.07,66.06,,,,,,,,,,
,5.54,5360,71.4,11.07,73.50,,,,,,,,,,
,6.14,5840,68.4,10.66,77.19,,,,,,,,,,
,6.72,6200,67.7,11.07,80.53,,,,,,,,,,
,7.34,6560,60.2,8.20,66.64,,,,,,,,,,
,8.01,5360,8.3,1.23,6.92,,,,,,,,,,
,8.73,4120,62.4,9.43,53.06,,,,,,,,,,
,9.31,4480,72.9,11.07,64.47,,,,,,,,,,
,9.92,4800,73.7,11.07,67.39,,,,,,,,,,
,10.50,5080,72.2,11.07,69.83,,,,,,,,,,
,11.15,5360,69.9,10.66,71.89,,,,,,,,,,
,11.74,5600,69.2,10.66,73.86,,,,,,,,,,
,12.31,5760,68.4,10.66,75.50,,,,,,,,,,
,12.98,5960,67.7,10.66,76.47,,,,,,,,,,
,13.61,6160,66.2,10.66,77.61,,,,,,,,,,
,14.29,6360,64.7,10.66,79.50,,,,,,,,,,

 

[flooky]

well looking here i guess my maf is on it's way out as forbez's readings are higher than mine and is ment to be right?

http://www.seatcupra.net/forums/showthread.php?t=107577&highlight=maf

But why dont VAG-COM find this fault? Please help!!!!

 

[bigjode]

The Maf can read low and yet the car won't know its a fault unless its reading zero - as far as the car is concerned a low reading just means less air, not a faulty MAF.

But by doing logs like you have done, you have found the fault.

And that MAF is DEFINATELY shagged m8!

 

[bigjode]

oh, for Lambda- log block 031- if it has two lambda readings then it can read it (some cars have a wide band sensor that reads lambda, some don't).

You want Lambda to be around 1 - it will fluctuate though like 0.8 to 1.2

 

[flooky]

ok thanks, i been looking at other posts and realise mine is well low... would a temp sender fault cause this problem also? thought I read it would?

so guess i'll have to get another MAF then! bugger. Long as nothing else can be causing my problem also.

 

[flooky]

oh, should i do any other logs on things that i should be aware of if the car is hesiting when on boost from 4k +?

 

[bigjode]

log block 118 - that shows what the N75 is doing to the wastegate to control boost, log 115 - that shows how much boost the ECU wants vs how much the car actually produces - helps diagnose leaks etc,

020 is good one to know, it shows timing pull - doesn't sound like thats your probmlem at the moment, but for future notice

 

[bigjode]

but the faulty MAF is probably responsible for your hesitation though

 

[flooky]

ok i'll log these tomorrow and post them here anyway.... cheers for your help man!

 

[flooky]

oh what would happen if i was to unplug or clean my maf? i know where i can get a new maf from a independent vag dealer.

 

[flooky]

SORRY IVE NO IDEA HOW TO MAKE THIS LOG CLEAN!





****This was a lambda test sat on idle****

Thursday,18,January,2007,11:22:46
6K0 906 032 ,,1.8L R4/20VT SEA 0002,

,Group A:,'031,,,,Group B:, Not Running,,,,Group C:, Not Running
,,Voltage,Voltage,Bin. Bits,Bin. Bits,,,,,,,,,,
,TIME,,,,,TIME,,,,,TIME,,,,
MARKER,STAMP, V, V,,,STAMP,,,,,STAMP,,,,
,0.01,0.595,0.460, , ,,,,,,,,,,
,0.60,0.090,0.480, , ,,,,,,,,,,
,1.11,0.660,0.445, , ,,,,,,,,,,
,1.71,0.095,0.420, , ,,,,,,,,,,
,2.32,0.180,0.430, , ,,,,,,,,,,
,2.92,0.675,0.420, , ,,,,,,,,,,
,3.60,0.085,0.435, , ,,,,,,,,,,
,4.29,0.705,0.430, , ,,,,,,,,,,
,4.81,0.105,0.440, , ,,,,,,,,,,
,5.42,0.130,0.450, , ,,,,,,,,,,
,6.01,0.710,0.430, , ,,,,,,,,,,
,6.62,0.650,0.455, , ,,,,,,,,,,
,7.24,0.080,0.475, , ,,,,,,,,,,
,7.86,0.160,0.440, , ,,,,,,,,,,
,8.48,0.690,0.420, , ,,,,,,,,,,
,9.12,0.100,0.435, , ,,,,,,,,,,
,9.73,0.695,0.430, , ,,,,,,,,,,
,10.32,0.110,0.455, , ,,,,,,,,,,
,10.89,0.120,0.470, , ,,,,,,,,,,
,11.40,0.695,0.440, , ,,,,,,,,,,
,12.00,0.085,0.445, , ,,,,,,,,,,
,12.60,0.685,0.450, , ,,,,,,,,,,
,13.20,0.105,0.445, , ,,,,,,,,,,
,13.90,0.690,0.455, , ,,,,,,,,,,
,14.61,0.795,0.445, , ,,,,,,,,,,
,15.20,0.055,0.520, , ,,,,,,,,,,
,15.80,0.065,0.505, , ,,,,,,,,,,
,16.40,0.105,0.425, , ,,,,,,,,,,
,17.01,0.635,0.380, , ,,,,,,,,,,
,17.62,0.070,0.375, , ,,,,,,,,,,
,18.21,0.090,0.355, , ,,,,,,,,,,
,18.81,0.750,0.350, , ,,,,,,,,,,
,19.51,0.065,0.395, , ,,,,,,,,,,
,20.20,0.075,0.380, , ,,,,,,,,,,
,20.81,0.685,0.335, , ,,,,,,,,,,
,21.40,0.660,0.375, , ,,,,,,,,,,
,22.00,0.065,0.435, , ,,,,,,,,,,
,22.60,0.100,0.345, , ,,,,,,,,,,
,23.21,0.710,0.340, , ,,,,,,,,,,
,23.85,0.075,0.460, , ,,,,,,,,,,
,24.48,0.725,0.380, , ,,,,,,,,,,
,25.10,0.335,0.505, , ,,,,,,,,,,
,25.71,0.070,0.540, , ,,,,,,,,,,
,26.31,0.675,0.390, , ,,,,,,,,,,
,26.90,0.575,0.390, , ,,,,,,,,,,
,27.51,0.110,0.485, , ,,,,,,,,,,
,28.11,0.560,0.390, , ,,,,,,,,,,
,28.71,0.080,0.505, , ,,,,,,,,,,
,29.36,0.725,0.435, , ,,,,,,,,,,
,29.98,0.110,0.490, , ,,,,,,,,,,
,30.60,0.095,0.490, , ,,,,,,,,,,
,31.19,0.805,0.435, , ,,,,,,,,,,
,31.79,0.760,0.540, , ,,,,,,,,,,
,32.39,0.085,0.535, , ,,,,,,,,,,
,32.98,0.110,0.500, , ,,,,,,,,,,
,33.60,0.735,0.465, , ,,,,,,,,,,
,34.21,0.785,0.475, , ,,,,,,,,,,
,34.83,0.785,0.520, , ,,,,,,,,,,
,35.49,0.760,0.530, , ,,,,,,,,,,
,36.20,0.715,0.525, , ,,,,,,,,,,
,36.82,0.710,0.520, , ,,,,,,,,,,
,37.40,0.630,0.510, , ,,,,,,,,,,
,37.99,0.080,0.495, , ,,,,,,,,,,
,38.59,0.215,0.470, , ,,,,,,,,,,
,39.19,0.550,0.440, , ,,,,,,,,,,
,39.81,0.645,0.430, , ,,,,,,,,,,
,40.47,0.080,0.430, , ,,,,,,,,,,
,41.19,0.680,0.415, , ,,,,,,,,,,
,41.78,0.095,0.415, , ,,,,,,,,,,
,42.30,0.110,0.420, , ,,,,,,,,,,
,42.88,0.700,0.410, , ,,,,,,,,,,
,43.51,0.090,0.425, , ,,,,,,,,,,
,44.07,0.110,0.440, , ,,,,,,,,,,
,44.68,0.305,0.425, , ,,,,,,,,,,
,45.31,0.080,0.430, , ,,,,,,,,,,
,45.98,0.100,0.415, , ,,,,,,,,,,
,46.68,0.690,0.410, , ,,,,,,,,,,
,47.28,0.660,0.430,


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


THIS IS WHEN THE CAR WAS JERKEY ON BOOST


Thursday,18,January,2007,11:29:54
6K0 906 032 ,,1.8L R4/20VT SEA 0002,

,Group A:,'002,,,,Group B:,'001,,,,Group C:,'115
,,RPM,Load,Inj. On Time,Mass Flow,,RPM,Temperature,Lambda,Bin. Bits,,RPM,Load,Absolute Pres.,Absolute Pres.
,TIME,,,,,TIME,,,,,TIME,,,,
MARKER,STAMP, /min,%, ms, g/s,STAMP, /min,°C,%,,STAMP, /min,%, mbar, mbar
,0.65,2120,75.2,11.07,31.25,1.32,2240,79.0,25.0,01101000,1.93,2360,77.4,1500.0,1520.0
,2.52,2440,77.4,11.48,36.33,3.13,2560,79.0,25.0,01101000,3.72,2680,75.9,1510.0,1520.0
,4.31,2760,75.9,11.07,39.67,4.95,2840,79.0,25.0,01101000,5.63,2960,75.9,1490.0,1510.0
,6.34,3040,75.9,11.48,44.11,6.94,3160,80.0,25.0,01101000,7.52,3240,75.2,1460.0,1500.0
,8.11,3320,75.2,11.07,48.22,8.72,3400,79.0,25.0,01101000,9.33,3480,74.4,1450.0,1480.0
,9.96,3560,73.7,11.07,50.47,10.56,3640,80.0,25.0,01101000,11.24,3720,72.9,1440.0,1460.0
,11.91,3800,72.2,10.66,53.19,12.46,3880,79.0,25.0,01101000,13.01,3960,72.2,1450.0,1450.0
,13.63,4040,71.4,10.66,55.31,14.23,4080,79.0,25.0,01101000,14.84,4160,72.2,1450.0,1450.0
,15.49,4240,72.2,10.66,57.69,16.08,4320,79.0,25.0,01101000,16.74,4320,72.9,1440.0,1470.0


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


BELIEVE IT OR NOT BUT WHEN THIS LOG WAS DONE THE CAR RAN FINE WITHOUT ANY PROBLEMS!


Thursday,18,January,2007,11:34:30
6K0 906 032 ,,1.8L R4/20VT SEA 0002,

,Group A:,'002,,,,Group B:,'118,,,,Group C:,'115
,,RPM,Load,Inj. On Time,Mass Flow,,RPM,Temperature,Load,Absolute Pres.,,RPM,Load,Absolute Pres.,Absolute Pres.
,TIME,,,,,TIME,,,,,TIME,,,,
MARKER,STAMP, /min,%, ms, g/s,STAMP, /min,°C,%, mbar,STAMP, /min,%, mbar, mbar
,0.59,2040,21.8,3.69,8.56,1.17,2080,26.0,0.0,1000.0,0.01,2040,19.5,990.0,1000.0
,2.38,2160,20.3,3.28,8.58,2.99,2200,26.0,0.0,1000.0,1.77,2120,21.1,990.0,1010.0
,4.24,2720,64.7,10.66,37.00,4.89,3160,24.0,49.0,1490.0,3.57,2440,54.1,1520.0,1060.0
,6.19,4120,72.9,11.89,57.78,6.77,4520,24.0,55.3,1500.0,5.57,3680,72.9,1480.0,1500.0
,7.98,5200,70.7,11.48,70.47,8.58,5560,27.0,59.2,1470.0,7.39,4920,73.7,1470.0,1480.0
,10.01,6080,66.9,11.48,78.39,10.70,5480,30.0,0.0,1250.0,9.26,5800,68.4,1480.0,1470.0
,11.88,4400,72.2,11.89,62.39,12.47,4560,31.0,54.9,1500.0,11.28,4240,62.4,1430.0,1330.0
,13.69,4840,71.4,11.89,67.25,14.32,5000,33.0,54.9,1480.0,13.10,4720,72.9,1450.0,1470.0
,15.71,5320,68.4,11.48,69.92,16.38,5440,35.0,56.9,1470.0,14.96,5160,70.7,1470.0,1460.0
,17.58,5680,67.7,11.48,73.72,18.19,5760,37.0,61.6,1480.0,16.98,5560,67.7,1490.0,1470.0
,19.38,5960,66.2,11.48,75.08,20.03,5120,36.0,0.0,1180.0,18.78,5880,66.9,1430.0,1470.0

 

[bigjode]

Maf readings are definately low, doesn't look like you have a boost leak though.

You havn't the wide band sensor on your car from the looks of block 031 - so I can't comment on the lambda. Other way to see A/F ratio is to download this:
http://www.ross-tech.net/vag-com/examples/air_fuel_EXAMPLE.xls

its an excel spreadsheet and if you copy and paste your block 002 results, it will show you your A/F ratio.

BUT remember, problems with A/F ratio can be down to lots of things, not just a faulty Lambda sensor.

PS to make a log look clean in a post, put ["code"] at the beginning and ["/code"] at the end, just like that with the square brackets etc. (not including " " )

 

[bigjode]

oh what would happen if i was to unplug or clean my maf? i know where i can get a new maf from a independent vag dealer.

your MAF is 100% Faulty. I think you'll be surprised how much difference a new one will make

Dealers sell them and GSF parts sell them - if you give em your fauty one its about £75 at GSF.

I don't think cleaning it will help yours, its too far gone! unplugging it may make it drive smoother, but its bad for the car as it can't control fueling properly.

 

[flooky]

na i think ive sorted the boost leak when i replaced my vac hoses with some nice samco stuff

yeah i can see the maf readings are low it's just so weird how when i can take it down the bypass and have this fault and turn around and do the same but yet the car is fine?

so from what i got u think my lambda readings are low? and if so would the maf be the main reason behind this? im just not sure now what to do.

Ive also got a low signal from the temp sender so i'll get one of these tomz.. someone did say this mite have an effect on things?

what do you think i should do now?

 

[bigjode]

No, your Lambda readings aren't how i'm used to seeing them, because my sensor is different to yours - I don't know what yours mean.

Temp sensor can cause problems too, but usually brings up a fault straight away.

MAF! MAF! MAF! MAF!

 

[flooky]

ok fair enough! see your point!

it's always read as a fault since i got vag-com..

i'll see what i can do for a new temp & man sensor tomorrow then.. see if i can get some trade!

will let ya know how it goes!

cheers! i think? god dam maf!!!