Following from this thread http://www.briskoda....__fromsearch__1

I had a look at Lance's octavia last thursday night.

Whilst we couldn't get it to stutter whilst plugged into vcds, we did notice something odd odd on the figures.

The lambda readings were all over the shop. I'm a little rusty with vcds and can't really remember if this is correct.

We plugged into my car which showed them at zero, unlike lances.

Can anyone shed some light on what we should have been seeing ??

I have logs and picture of the graph running and can post these up later when I get home

thanks for assisting in the week Dave.... I dont think the lambda sensor is that much to change so going to change it this week when get some spare time, as per the earlier thread have done or checked most things that would give the same symptoms... I`ll let you know how I get on after the sensor change... How were the beers ?

What blocks did you log Dave?

Block 031 will give you lambda actual value against lambda specified value (ECU expected value) so if those are way off matching then I'd say there's a problem with the sensor. The values should be near 1.000 but drop closer to 0.850 under hard acceleration as the mixture gets richer.

Block 032 gives you the additive (idle) and multiplicative (under load) fuel trim adjustments which it sounds like that might have been what you logged? They need to be within about 10% -/+ to be normal.