VW sudden power loss issues

[LunchboxVRS]

But isn't less fuel injected into the combustion chamber during combustion and then extra fuel is injected during the exhaust stroke? I read somewhere that a leaner mixture in a diesel increases NOx levels which increases temperatures helping to burn off all the soot.
I could be totally wrong but that's what I thought. Also (and I know these aren't always accurate) but the instant fuel consumption gauge normally sits at 0.4 litres per hour (at idle) and decreases to 0.2 and sometimes 0.1 litres per hour during a regeneration cycle.

NOx levels are reduced buy adding a innert gas (exhaust gas) into the intake which lowers the temp and reduces the available space for combust able materials. This effects efficiency but its a trade off to keep emissions low.
This is seperate to DPF regeneration. Most common rail diesels will inject several small injctions instead of 1 big one during the compression stroke and if needed 2 to start a burn on the exhaust stroke. if a burn is started the EGR which directs exhaust gas into the intake is closed. For regeneration to take place the exhaust needs to reach over 600 degrees. So cooling the charge air would not help so EGR is shut. NOx gases will go up during this time.

[alexaescht]

VW sudden power loss issues

My understanding is that during regeneration, additional injector pulses are used when the exhaust valve opens to get a flame into the exhaust and take care of the soot, hence the additional fuel consumption.

NOx levels are reduced buy adding a innert gas (exhaust gas) into the intake which lowers the temp and reduces the available space for combust able materials. This effects efficiency but its a trade off to keep emissions low.
This is seperate to DPF regeneration. Most common rail diesels will inject several small injctions instead of 1 big one during the compression stroke and if needed 2 to start a burn if a burn is started the EGR which directs exhaust gas into the intake is close. For regeneration to take place the exhaust needs to reach over 600 degrees. So cooling the charge air would not help so EGR is shut. NOx gases will go up during this time.

Thanks for clarifying guys Makes much more sense now.

[gavs]

VW sudden power loss issues

Has anyone experienced the power loss issues as reported in the media recently?

It seems overheating in some engines can activate the "limp home" mode. If my 6r Polo had a temperature guage, then I would have half a chance in preventing such scenario.

VEEEUU

Yes, when the mechatronics shat its pants in mine, I lost everything for 3-4 seconds that I could consciously notice while my brain was primarily trying to work out what the hell was happening. Can't comment on steering but I lost power, any accelerator effect, brakes, audio...

[yokom46]

Has anyone experienced the power loss issues as reported in the media recently?

It seems overheating in some engines can activate the "limp home" mode. If my 6r Polo had a temperature guage, then I would have half a chance in preventing such scenario.

VEEEUU

I've had something similar.

Driving at 110km/h on a highway and dropped to 4th to overtake a truck, it boosted nicely but as I got about half way along the truck I lost all boost, and the engine light was flashing.
I dropped it back up to 7th and pulled back in behind the truck where the engine light stopped and the EPC limp home light came on.

After a restart the car was fine, VW dealer in Phillip ACT said there was nothing in the logs indicating that it even happened. And sent me on my way.

Happened once since, the car is going back in next Wednesday for a worn clutch / dsg issue check.