Help with lambda probe test

ililovski · 30-09-2007, 16:16

I have a Fabia 1.4 44kw AZE, 2001, 62000 miles. Since two months I am experiencing problems when idle. There is a little shaking and vibration. I was at the dealer, they found nothing and told me that is normal. I also went trough a number of threads in the forum, which also state the behavior is normal. But I just can't accept this. There was nothing like this before. I bought a cable to look for the problem. It looks to me that the lambda probe is not giving correct output. I also searched google and saw a number of lambda waveforms, but it looks like they are different for the different makes and models.
So, please, if somebody has experience with this, could you please look at the output (attached) and give me your opinion on the lambda probe condition.
The file contains the following groups:

3,1,Engine Speed,,Specification (manual): 800...900 RPM | Specification (automatic): 630...800 RPM
3,2,Intake manifold,pressure,Specification: 240...420 mbar
3,3,Throttle Drive,Angle Sensor 1,for EPC (G187) | Specification: 0.0...11.0 %
3,4,Ignition,Timing Angle,Specification: 0.0...10.0 °BDTC

33,1,Bank 1,Lambda Control,Specification: -10.0...+10.0 %
33,2,Bank 1 Voltage,of Oxygen Sensors,Specification: 0.00...1.00 V
33,3,NA
33,4,NA

32,1,Lambda (add.),Self-Adaptation,Specification: -10-+10%
32,2,Lambda (mult.),Self-Adaptation,Specification: -10-+10%

Lummox · 30-09-2007, 17:00

Really for those values to make any sense they need to be live data. We would need to see how the lambda probe is acting and if its output varies or if it is stuck on open loop.

ililovski · 30-09-2007, 19:53

I have attached the live data (csv log) in the zip. I started the log at engine idle, then increased the engine speed trying to hold at about 2600 and dropped again to idle. Or you need something else?

Mickski · 11-04-2008, 14:28

If you encount trouble with idle state, the MVB#32 field one should be check : additive fuel trim is used in idle state whereas multiplicative fuel trim is used in charge state.

Furthermore, you should give us the result of the Readiness.

30-09-2007, 17:00	#2
Lummox Hairy Yeti Join Date: Sep 2003 Location: Newport Pagnell Posts: 21,137 Thanks: 18 Thanked 535 Times in 468 Posts	Re: Help with lambda probe test Really for those values to make any sense they need to be live data. We would need to see how the lambda probe is acting and if its output varies or if it is stuck on open loop. __________________ MK2 Golf GTi - APX 225bhp 1.8T - Emerald K3 - Quaife ATB - VR6 Widetrack - VR6 brakes front and rear - Neuspeed ARBs - Speedline alloys - H+R coilovers - Powerflex bushes - Helix clutch G60 flywheel - Adjustable solid top mounts - Custom engine bay - Tornado Motorsport MSA cage - and lots lots more.

11-04-2008, 14:28	#4
Mickski Briskodian Join Date: Apr 2008 Location: France, Paris Posts: 6 Thanks: 0 Thanked 0 Times in 0 Posts	Re: Help with lambda probe test If you encount trouble with idle state, the MVB#32 field one should be check : additive fuel trim is used in idle state whereas multiplicative fuel trim is used in charge state. Furthermore, you should give us the result of the Readiness. __________________ Seat Leon 1.8 20VT MRC owner.

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30-09-2007, 19:53	#3
ililovski Briskodian Join Date: Sep 2007 Posts: 4 Thanks: 0 Thanked 0 Times in 0 Posts	Re: Help with lambda probe test I have attached the live data (csv log) in the zip. I started the log at engine idle, then increased the engine speed trying to hold at about 2600 and dropped again to idle. Or you need something else?