JLR Workshop fun

[m_c]

Certainly in car tech, it's common but not universal - other JLR models have the SCR after the DPF

Everything I've worked on, the SCR has been downstream, but i rarely deal with cars.

An efficiency fault like that on something French would usually be the SCR cat failing, as they only seem to be good for 80-100k.
Also seen plenty DPF failures on Stellantis things, which results in DeNOX efficiency faults as the SCR gets coated in soot.

Although the latest Boxer and Sprinter engines have two adblue injectors. The usual location, but also one immediately after the turbo, however I've not dug into what the the cat setup is yet.

 

[dobbslc]

Also seen plenty DPF failures on Stellantis things

A work colleague has had three brand new hire vans fail with less than 4k on the clock (Citroen, Peugeot), he only does shortish journey's at less than 40mph in centre London. I've had no trouble with the same vans but I do a 10 miles blast up and down the M1 every day.
Why don't they make petrol vans???

 

[m_c]

A work colleague has had three brand new hire vans fail with less than 4k on the clock (Citroen, Peugeot), he only does shortish journey's at less than 40mph in centre London. I've had no trouble with the same vans but I do a 10 miles blast up and down the M1 every day.
Why don't they make petrol vans???

They certainly did do petrol, but they had their own issues.
However hire companies will likely mainly buy diesel vans for short term rental as that's the most suitable for how they operate, and what most customers expect.

 

[Bornfree]

My 2023 stellantis van has a pat fluid tank as well as add blue. No idea what it does.

 

[m_c]

My 2023 stellantis van has a pat fluid tank as well as add blue. No idea what it does.

Eolys fluid.
It makes the resultant carbon easier to burn off.

 

[Guineafowl]

As I've not experienced any of their output

A bit of a busman’s holiday for you, but it is fun and presented as such. I think they’d say engine designers do know best, but the final product is compromised by the ‘bean counters’, emissions, WLTP, that sort of thing.

Anyway, the guy can do a nut-and-bolt rebuild of a D3/4, including line-boring the mains with a homemade rig, while maintaining a constant good-natured bickering with his wife. I think we would have several divorces before getting the body lifted

 

[knighty]

2017 range rover vogue (think that makes it an L405?

automatic boot keeps stopping when it's going up.... sometimes it's fine, sometimes sops once, sometimes 3 times (pressing remote button again to make it keep going)

any ideas before I investigate?

 

[addjunkie]

2017 range rover vogue (think that makes it an L405?

automatic boot keeps stopping when it's going up.... sometimes it's fine, sometimes sops once, sometimes 3 times (pressing remote button again to make it keep going)

any ideas before I investigate?

Good luck….or youll be buying a boat





Bring
Out
Another
Thousand

 

[Ubique]

2017 range rover vogue (think that makes it an L405?

automatic boot keeps stopping when it's going up.... sometimes it's fine, sometimes sops once, sometimes 3 times (pressing remote button again to make it keep going)

any ideas before I investigate?

Check the starter battery, if it's a 4.4TDV8, also check the 70Ah aux. battery behind the RH panel in the boot.
If it stops and beeps several times, likely to be one of the liftgate power struts on the way out.

 

[Ubique]

Short & sweet one from today - 4.4TDV8 giving 'restricted performance' message when driven enthusiastically, road test confirms concern occurs over 3000rpm, so essentially when the vacuum operated CSOV(charge-air shut off valve) and TSOV (Turbine shut off valve) are operated. DTC's confirm an overboost is triggering the restricted performance, no airflow correlation DTC which eliminates the CSOV.
The secondary fixed turbine has a shut off valve, along with a position sensor to form a closed-loop feedback circuit, the vacuum valve is a changeover type, at rest, the actuator line is vented to atmosphere, under actuation (straight on/off, no PWM), the actuator line is switched to the engine vacuum supply.

Both signals are accessible as live values:-

So it's immediately obvious that there is a problem with the TSOV, it's actuating OK, but not releasing quick enough - thereby causing overboost.

This guy has already been told 'by someone that knows a bit' that he'll need a new secondary turbine, well, if the rate of rise was slow, I'd probably have the same thing come to mind - except the TSOV is operating just fine when vacuum is applied, so it's unlikely to be the actuator or the mechanical linkage.
The first test is to use a hand vacuum pump & gauge to actuate & release the turbo, observing the live values. This was done with a hot engine in case the cause is related to heat expansion. the turbo actuated and released just fine, so time to check the vacuum solenoid and lines, I decided to remove the 'atmosphere' line from the solenoid and actuate using diagnostics - result! so the culprit is a restricted atmosphere line (this is shared with three other components, which were not suffering any reported issues, so it can be localised to part of the vacuum harness.
It turns out there is a small engine oil leak from one of the timing chain tensioner fasteners, dripping onto the flexible hose and causing it to swell and get all sticky internally - this was restricting the clean air into the solenoid, replacing the short piece of hose (£1.50) and road testing gave this:

A nice little win for a Friday - and the car's booked in for the oil leak to be rectified, so a secondary bonus upsell.

 

[knighty]

Check the starter battery, if it's a 4.4TDV8, also check the 70Ah aux. battery behind the RH panel in the boot.
If it stops and beeps several times, likely to be one of the liftgate power struts on the way out.

Thanks, I'll check both the batteries, (yes 4.4tdv8)

It only beeps once... if it keep pressing the button it'll keep trying and make it after a few goes