Any additional logs would be handy thanks

I'm also going to log idle speed vs MAF vs injected quantities as I seem to have just gained a glowplug error.

Now this could perfectly be a single glowplug going bad, but then IIRC the glowplugs and injectors on these things are powered by the same loom, which is yet another thing to add to the list of possible things.

The AUDI forums suggest dropping it from 830 to 820 i think,

Edited 18 February, 201016 yr by cheezemonkhai

Knock yourself out on my logs..........

all rename to .xls

Let me know if you can see any weird issues that might cause rough light throttle, ta

LOG-01-001-002-003.txt

LOG-01-001-002-003ccccccc.txt

LOG-01-001-002-003zzzzzz.txt

LOG-01-001-013-003xx.txt

I'm going to have a look at what I can get off the logs and look at MAF, RPM, injected quantities and also see if I can see the EGR functioning via vag com.

If I can log that lot, I'll post how to do it here and it might help you too

Only thing I can think of is idle is v low, so putting foot down the excess exhaust gas in there from EGR means it's not really get enough air to burn properly for a very small moment. Would be odd though since a derv runs with massive excesses of air.

Yo, get anywhere with this?

I have possibly discovered the issue with my car....my timing is retarded.....

On another forum I've done a bit of research and found that in VAG COM under Engine and measuring blocks 004, last column it shows you a value (Torsion). Mine is -2 and for ideal smooth idle it should be close to 0.

With retarded timing it aparently causes the rough idle etc...

Gonna see if I can amend that by advancing the timing a bit. The issue is finding a place that will do it for a reasonable price... Skoda dealer wants £206 ROF !!!!!!!!

Edited 23 March, 201016 yr by Plantman

On 22/10/2009 at 12:59, cheezemonkhai said:

Indeed it's like the engine is missing a cylinder, although obviously it isn't.

I'm blaming it on making a car breath it's own farts at idle to meet emissions requirements.

Mine has begun to do this having run perfectly for a few thousand miles after trustbuilding replaced throttle body and o2 sensor ... 

 

I think it feels like the engine is trying to go high revs egr/dpf regen 10k revs ish at idle but is faiing to kick in properly so then tries again (and again and again ...

 

this is another very old thread  .... are any of you still on here ???

Mine did this. When warm it developed a very uneven and Lumpy idle. Turned out it was an injector failing. It was probably squirting too much fuel in and the ECU tried to compensate by trimming the other injectors. You could see it on the VCDS injector values. It also smoked a bit at startup as if diesel was leaking into cylinder. Replaced with used injector off Eeabay and car runs fine now. 

In the end I increased the idle to about 900 and that sorted it until I changed cars.