Rough idle when cold?

[ashsavaryn]

Hello, I’m hoping someone can help me with an issue I’ve been having recently with my van. Whenever it’s started up from cold the idle is very rough sounding almost like it’s on 3 cylinders, the revs are all over the place, but doesn’t cut out, can also notice it is jerky when driving until it is up to temperature and then it is fine. Also noticed if you stand behind the van it smells very fumey, again this goes away once warmed up. The only other thing I have noticed is that when the van is doing a regen despite being warmed up it still has a slight miss to it on idle when the revs are slightly increased. The van is a 2019 150ps highline just over 50k miles. Just wondering if anyone has had a similar issue or can help please! Have tried various egr cleaner & new fuel filter.

 

[Ads_Essex]

Just wondering if anyone has had a similar issue or can help please!

There are a few threads on here that may help - click on this tag:

lumpy

www.t6forum.com

 

[jon1979]

Hello, I’m hoping someone can help me with an issue I’ve been having recently with my van. Whenever it’s started up from cold the idle is very rough sounding almost like it’s on 3 cylinders, the revs are all over the place, but doesn’t cut out, can also notice it is jerky when driving until it is up to temperature and then it is fine. Also noticed if you stand behind the van it smells very fumey, again this goes away once warmed up. The only other thing I have noticed is that when the van is doing a regen despite being warmed up it still has a slight miss to it on idle when the revs are slightly increased. The van is a 2019 150ps highline just over 50k miles. Just wondering if anyone has had a similar issue or can help please! Have tried various egr cleaner & new fuel filter.

Did you manage to sort this? I have the same problem….Thanks

 

[Dellmassive]

Could be a glow plug problem.

Can you get a video clip of a cold start and drop a link to it here?

You need to get the van scanned for codes as well to get some direction.

 

[jon1979]

Could be a glow plug problem.

Can you get a video clip of a cold start and drop a link to it here?

You need to get the van scanned for codes as well to get some direction.

Yes that’s the thing no codes in engine module. Smell from exhaust on cold start and engine is mis firing. Then once warm all totally fine and wouldn’t know there was a problem.

 

[Dellmassive]

Sounds like glow plugs..

Have you got access to vcds ?

 

[jon1979]

Unfortunately not

 

[Dellmassive]

@mmi is there a known glow plug test via vcds?

Or if not, what PIDs are best to look at for glow plug tests.

 

[mmi]

@mmi is there a known glow plug test via vcds?

Just a test for glow time control module.
However, I'm confident that a failed glow plug would manifest itself as emission warning light on dash

Or if not, what PIDs are best to look at for glow plug tests.

Only these two, however I don't expect to see anything unusual in them.

• IDE00363 Glow status
• IDE00364 Pre-glow time

Perhaps have a look into

Lumpy T6 - Triggers Broom! Misfire & Vibration under 1500rpm.

Hi All, I have a 2018 T6, that I'm running out of patience with... and garages... So I have purchased VCDS to try and get to the bottom of it... First issue was it started to use coolant, I swapped a known good charge cooler to eliminate that, Max to min in around 100 miles, So took it to VW...

www.t6forum.com

 

[jon1979]

Could anybody advise torque setting for hpfp pulley when replacing pump?

 

[Mixsy]

I’ve had the same lumpy first morning start. Drive to the end of the street, turn off then start back up again, you wouldn’t think anything was wrong. I’ve run a couple of bottles of the VW additive through 2 tanks off fuel and it’s back to normal, I’ve always been very sceptical about additives, but thought it was worth a try and it’s worked. Could’ve been a bit of shit in the injectors.