VW T6 2.0tdi 140bhp CAAC, potential fuel issues?

[cal2010]

Hi,

So I have sluggish acceleration can't even keep up with a 101bhp T6. Erratic MPG sometimes it's good sometimes it's bad.

Had a fault code for low fuel pressure which was cleared and never came back and also a fault for intermittent cam shaft position sensor cleared and never came back.

Attached some VCDS readings I'm struggling to find what the actual values should be after purchasing workshop manuals there's not really much information.

I have also reset some of the fuel pressure sensors, the VCDS readings was taken at optimum temps and at idle. Some was taken before the reset of the fuel sensors.

Can anyone please point me in the right direction?

 

[mmi]

I would start by sharing the following

1. Full VCDS Auto-Scan
2. Engine blockmap data - ignition ON, engine OFF
3. Engine blockmap data - cold engine running at idle
4. Engine blockmap data - hot engine running at idle

---

How-to:

VCDS > Applications > Controller Channel Map >

For "Single controller address" - 01​

Tick/fill boxes as above and click Go. ​

VCDS flashes screens for a moment (when finished hit "Done, Go Back") and there is a file blockmap-01-... in folder C:\Ross-Tech\VCDS\Logs\....

Note: only VCDS HEX-V2 and VCDS HEX-NET cables have the capability to create blockmap files.

 

[cal2010]

I would start by sharing the following

1. Full VCDS Auto-Scan
2. Engine blockmap data - ignition ON, engine OFF
3. Engine blockmap data - cold engine running at idle
4. Engine blockmap data - hot engine running at idle

---

How-to:

VCDS > Applications > Controller Channel Map >

For "Single controller address" - 01​

Tick/fill boxes as above and click Go. ​

VCDS flashes screens for a moment (when finished hit "Done, Go Back") and there is a file blockmap-01-... in folder C:\Ross-Tech\VCDS\Logs\....

Note: only VCDS HEX-V2 and VCDS HEX-NET cables have the capability to create blockmap files.

Thanks very much I will give that a go and post the results.

 

[cal2010]

I would start by sharing the following

1. Full VCDS Auto-Scan
2. Engine blockmap data - ignition ON, engine OFF
3. Engine blockmap data - cold engine running at idle
4. Engine blockmap data - hot engine running at idle

---

How-to:

VCDS > Applications > Controller Channel Map >

For "Single controller address" - 01​

Tick/fill boxes as above and click Go. ​

VCDS flashes screens for a moment (when finished hit "Done, Go Back") and there is a file blockmap-01-... in folder C:\Ross-Tech\VCDS\Logs\....

Note: only VCDS HEX-V2 and VCDS HEX-NET cables have the capability to create blockmap files.

Hi I managed to get this if you could help please, much appreciated

 

[cal2010]

I would start by sharing the following

1. Full VCDS Auto-Scan
2. Engine blockmap data - ignition ON, engine OFF
3. Engine blockmap data - cold engine running at idle
4. Engine blockmap data - hot engine running at idle

---

How-to:

VCDS > Applications > Controller Channel Map >

For "Single controller address" - 01​

Tick/fill boxes as above and click Go. ​

VCDS flashes screens for a moment (when finished hit "Done, Go Back") and there is a file blockmap-01-... in folder C:\Ross-Tech\VCDS\Logs\....

Note: only VCDS HEX-V2 and VCDS HEX-NET cables have the capability to create blockmap files.

I have noticed the throttle valve position is 83.5% cold and 83.9% hot idle seems quite high tbf but totally unsure if this is normal for this vehicle or not?

 

[mmi]

Hi I managed to get this if you could help please, much appreciated

Thank you very much.
Do you know the history of the van? How long have you owned the van (how many miles)?

It looks like that at least the DPF is deleted - e.g the data below is very strange. Wouldn't expect them all to be plain zeros. Not even the exhaust temperature sensors report anything (this engine doesn't have sensor 2).




What does VCDS Advanced ID report about the engine?

VCDS > Select > 01-Engine > Advanced ID ​

Also interested to see what is reported in

VCDS > OBD-II Functions > Mode 1-01 Readiness​

and​

VCDS > OBD-II Functions > Mode 9 Vehicle Info ​

​

---

To further evaluate the performance of the engine e.g. following data set might be useful to understand how it runs.

VCDS > Select > Engine > Advanced Measuring Values

tick the following data items

IDE00021 Engine RPM​

IDE00075 Vehicle speed​

IDE00100 Engine torque​

IDE00188 Fuel high-pressure: actual value​

IDE00190 Charge air pressure: specified value​

IDE00191 Charge air pressure: actual value​

IDE00201 High fuel pressure: specified value​

IDE00347 Air mass: actual value​

IDE00396 Charge air pressure actuator: acknowledgment​

IDE03353 Particle filter differential press. sensor: uncond. voltage​

IDE04259 High press EGR actuator: actual unconditioned volt val​

IDE04263 Sensor for particle filter differential press: raw value​

Spoiler: How to save/load the measurement setup

The measurement setup can be saved for the next run - click on top left corner (Save/Load)

Tick Group UDS requests by 7 (or 8, whichever value keeps data alive)

​

Log > Start (do not forget to start logging!!!)

Do a journey - find a spot to accelerate at full throttle from about 1300 to 2300 RPM on a single gear (3rd or higher if possible, uphill), and then let it coast down foot off throttle.

Stop logging.

The log file will be stored in folder C:\Ross-Tech\VCDS\Logs

 

[cal2010]

Thank you very much.
Do you know the history of the van? How long have you owned the van (how many miles)?

It looks like that at least the DPF is deleted - e.g the data below is very strange. Wouldn't expect them all to be plain zeros. Not even the exhaust temperature sensors report anything (this engine doesn't have sensor 2).


View attachment 273759

What does VCDS Advanced ID report about the engine?

VCDS > Select > 01-Engine > Advanced ID ​

---

To further evaluate the performance of the engine e.g. following data set might be useful to understand how it runs.

VCDS > Select > Engine > Advanced Measuring Values

tick the following data items

IDE00021 Engine RPM​

IDE00075 Vehicle speed​

IDE00100 Engine torque​

IDE00188 Fuel high-pressure: actual value​

IDE00190 Charge air pressure: specified value​

IDE00191 Charge air pressure: actual value​

IDE00201 High fuel pressure: specified value​

IDE00347 Air mass: actual value​

IDE00396 Charge air pressure actuator: acknowledgment​

IDE03353 Particle filter differential press. sensor: uncond. voltage​

IDE04259 High press EGR actuator: actual unconditioned volt val​

IDE04263 Sensor for particle filter differential press: raw value​

Spoiler: How to save/load the measurement setup

The measurement setup can be saved for the next run - click on top left corner (Save/Load)
View attachment 273764

Tick Group UDS requests by 7 (or 8, whichever value keeps data alive)

View attachment 273765​

Log > Start (do not forget to start logging!!!)

Do a journey - find a spot to accelerate at full throttle from about 1300 to 2300 RPM on a single gear (3rd or higher if possible, uphill), and then let it coast down foot off throttle.

Stop logging.

The log file will be stored in folder C:\Ross-Tech\VCDS\Logs

Thanks and only owned it a few months, 105000 miles, I believe the DPF and EGR has been deleted yes.

 

[mmi]

Thanks and only owned it a few months, 105000 miles, I believe the DPF and EGR has been deleted yes.

Thanks. How many miles you have driven?
Do you think if the DPF filtering matrix has been removed or is it still in place? The data somewhat suggests the engine can't do proper DPF regeneration.

 

[cal2010]

Thanks. How many miles you have driven?
Do you think if the DPF filtering matrix has been removed or is it still in place? The data somewhat suggests the engine can't do proper DPF regeneration.

I have done 5k miles, I believe the matrix has been removed and all mapped out do you think the map could have failed?

Is the throttle valve position correct or is that something that could be caused by this?

 

[mmi]

I believe the matrix has been removed and all mapped out do you think the map could have failed?

Ok, the not a clogged DPF strangling exhaust flow. Then obviously doesn't do DPF regens at all - so a distance counter seems to be just a remnant of original software.

About 4764 km = 2960 miles since last... "incident" -

Is the throttle valve position correct or is that something that could be caused by this?

On idle the data seems to be as expected - specified=normed.

Also the oxygen sensor reports plenty of leftover oxygen in the exhaust - probably because of no exhaust recirculation - so not restricted there.

Have you checked for leaks in the intercoooler?

P0299, coil light flashing and a whooshing noise from under the car

Driving back from fishing today and VAN start whooshing very loud when accelerating hard, then lost power and start smoking black, then the coil sign start flashing and went to limp mode. I scanned the code when got home and got P0299. I checked all the EGR pipes and the intercooler hoses and...

www.t6forum.com

Fault codes 07144 & 05171

Hello All, Wondering if anyone is able to shed any light on some Carista codes, as I'm out of ideas. Van went into limp mode with flashing glow plug symbol and generated codes 07144 - Data bus on board diagnostic interface: check DTC memory 05171 - Turbo/supercharger under boost local garage...

www.t6forum.com

 

[cal2010]

Ok, the not a clogged DPF strangling exhaust flow. Then obviously doesn't do DPF regens at all - so a distance counter seems to be just a remnant of original software.
View attachment 273784
About 4764 km = 2960 miles since last... "incident" -


On idle the data seems to be as expected - specified=normed.
View attachment 273781
Also the oxygen sensor reports plenty of leftover oxygen in the exhaust - probably because of no exhaust recirculation - so not restricted there.

Have you checked for leaks in the intercoooler?

P0299, coil light flashing and a whooshing noise from under the car

Driving back from fishing today and VAN start whooshing very loud when accelerating hard, then lost power and start smoking black, then the coil sign start flashing and went to limp mode. I scanned the code when got home and got P0299. I checked all the EGR pipes and the intercooler hoses and...

www.t6forum.com

Fault codes 07144 & 05171

Hello All, Wondering if anyone is able to shed any light on some Carista codes, as I'm out of ideas. Van went into limp mode with flashing glow plug symbol and generated codes 07144 - Data bus on board diagnostic interface: check DTC memory 05171 - Turbo/supercharger under boost local garage...

www.t6forum.com

No leaks in intercooler and vacuum pipes look all good and electric connectios, the erratic mpg, quite substantial it seems to be intermittent this week it's been really good on fuel.
Whereas last week it did 300 miles to a full tank. Sluggish acceleration is always there though.

 

[mmi]

Sluggish acceleration is always there though.

Is this different now than it has been?
At what revs/speed?

 

[cal2010]

Ok, the not a clogged DPF strangling exhaust flow. Then obviously doesn't do DPF regens at all - so a distance counter seems to be just a remnant of original software.
View attachment 273784
About 4764 km = 2960 miles since last... "incident" -


On idle the data seems to be as expected - specified=normed.
View attachment 273781
Also the oxygen sensor reports plenty of leftover oxygen in the exhaust - probably because of no exhaust recirculation - so not restricted there.

Have you checked for leaks in the intercoooler?

P0299, coil light flashing and a whooshing noise from under the car

Driving back from fishing today and VAN start whooshing very loud when accelerating hard, then lost power and start smoking black, then the coil sign start flashing and went to limp mode. I scanned the code when got home and got P0299. I checked all the EGR pipes and the intercooler hoses and...

www.t6forum.com

Fault codes 07144 & 05171

Hello All, Wondering if anyone is able to shed any light on some Carista codes, as I'm out of ideas. Van went into limp mode with flashing glow plug symbol and generated codes 07144 - Data bus on board diagnostic interface: check DTC memory 05171 - Turbo/supercharger under boost local garage...

www.t6forum.com

I might take to the tuners near me and ask them to check for a bad map, you never know what someone has previously done to it really. I've always thought a throttle body should be around 10% to 18% open on idle. Unless VW do it backwards and it's 83% closed on idle.

 

[mmi]

I've always thought a throttle body should be around 10% to 18% open on idle. Unless VW do it backwards and it's 83% closed on idle.

I'm highly confident that on these engines the throttle is fully open on idle. Just because it seems to be in same position at higher engine loads.

Just to demonstrate below graphs of my engine. The first graph is just elevation profile to show engine power "demand" as was driven using cruise control The second graph shows throttle valve position peaking at steeper parts of incline.

 

[cal2010]

I'm highly confident that on these engines the throttle is fully open on idle. Just because it seems to be in same position at higher engine loads.

Just to demonstrate below graphs of my engine. The first graph is just elevation profile to show engine power "demand" as was driven using cruise control The second graph shows throttle valve position peaking at steeper parts of incline.

View attachment 273803
View attachment 273804

The butterfly valve on mine is open fully with ignition off just took the inlet pipe off to check. Turned ignition on and it doesn't move.

 

[cal2010]

I'm highly confident that on these engines the throttle is fully open on idle. Just because it seems to be in same position at higher engine loads.

Just to demonstrate below graphs of my engine. The first graph is just elevation profile to show engine power "demand" as was driven using cruise control The second graph shows throttle valve position peaking at steeper parts of incline.

View attachment 273803
View attachment 273804

Problem solved had the van mapped over the weekend with a local tuner, seems to have resolved all issues. Must have had a crap map on it from previous owner.

 

[cal2010]

I'm highly confident that on these engines the throttle is fully open on idle. Just because it seems to be in same position at higher engine loads.

Just to demonstrate below graphs of my engine. The first graph is just elevation profile to show engine power "demand" as was driven using cruise control The second graph shows throttle valve position peaking at steeper parts of incline.

View attachment 273803
View attachment 273804

Thanks for your help