Evoque Owners Club banner

1 - 20 of 22 Posts

·
Registered
Joined
·
7 Posts
Discussion Starter #1
Hi from New Zealand.

We own a 2012 2.2lt Diesel Evoque with the Duratorq engine. My wife has an hour commute to the city daily which is about 80 kms of open road driving.

The Evoque starts, runs and gets along the motorway without any issues until about the 37 - 40 min mark where she pulls off the motorway to an intersection and then there's "restricted performance". The engine is slow to accelerate, the RPM labours to build but eventually hits the necessary RPM to shift gears and does so. I think the problem manifests on the highway but the higher vehicle speeds mask the problem until you come to a halt.

Lately, it decided to go from intermittent problem to regular occurence and because I was away on business, she took it to the local RR dealer who couldn't replicate the problem but managed to charge her $900 for a look and the stereo bluetooth upgrade (another story...). With their lack of problem solving ability, she took it to an automatic transmission specialist who confirmed the problem but also confirmed my thoughts that it appears to be nothing to do with the gearbox.

There is no warning light or restricted performance alert on the console. My thoughts shifted to something mechanical and I suspect the Turbo Waste Gate Actuator, so I purchased a Blue Driver OBD and have been running diagnostics on it but there are no codes nor any other intel that suggests what is the problem.

I did notice on the first couple of long scans that the data from the Inlet Air Temperature Sensor became intermittent after approximately 30 mins and then stopped entirely around the 37 - 39 min mark. Thinking I had found the issue through some great sleuthing, I spent four hours yesterday tracking down the location of the Boost/Air Temperature Sensor to find that it is in the front RH lower corner of the engine bay. It is mounted into the outlet of the Intercooler just before the cross over pipe that feeds into the inlet manifold. I literally had to take off the RH front of the car to get access to the sensor [Part # DEU 31303975] and while doing so removed and cleaned the cross over pipe. I removed, cleaned and reinstalled the Sensor but the test drive into the city today showed that the problem hadn't gone away AND that the Air Temperature Sensor was reporting temperatures without missing a beat.

I began to think that the fault diagnosis system was faulty so I left the top clamp for the cross-over pipe loose and took it for a drive. The first boost blew the hose off and illuminated the "restricted power" plus a "Turbocharger/Supercharger Boost System Performance" P2263 and "MAP" P006A error codes.... which proved the system is working. Bolted up the pipe and they all cleared.

So... I will disassemble the front of the car and change out the Boost Pressure and Inlet Temperature Sensor as a precaution when I get one but does anyone else have any other ideas?

I still suspect the wastegate...??
 

Attachments

·
Registered
2013 L538 RR Evoque Pure Tech td4
Joined
·
2,000 Posts
Wow what an epic task, sorry to hear the replacement was not successful.
I can’t offer any advice but good luck tracking it down.
 

·
Super Moderator
Joined
·
2,471 Posts
Are you still getting restricted performance on dash? As there should be an error code and it deliberately reduces the available power.

Other issues that can cause loss of power at speed is the fuel filter restricted, there were quite a few of these a while ago on these models, unlikely this will cause a error code.

I remember mine looking like that when the headlights ballast blew, also front bumper half off to remove headlight, getting the arch liner back in the right place was the hardest part.
 

·
Registered
Joined
·
7 Posts
Discussion Starter #5
Are you still getting restricted performance on dash? As there should be an error code and it deliberately reduces the available power.

Other issues that can cause loss of power at speed is the fuel filter restricted, there were quite a few of these a while ago on these models, unlikely this will cause a error code.

I remember mine looking like that when the headlights ballast blew, also front bumper half off to remove headlight, getting the arch liner back in the right place was the hardest part.
Hi Phil,
Absolutely nothing on the dash. I tested the system as mentioned to check that it would work by letting the cross-over pipe come off and when that occurred - I received the Restricted Performance indication.
I've changed the fuel filter in the past, so it wouldn't be a bad idea to do that again to ensure it wasn't that. If restricted fuel was an issue, why would it only happen when the vehicle was running for 30 - 40 mins? Thanks very much for the advice.
 

·
Super Moderator
Joined
·
2,471 Posts
For the fuel, it was more that you mentioned it happened after going on the highway, obviously the constant fuel flow is highest and so a slight restriction can start to show up through loss of fuel pressure, which when revving up and down does not occur as there are periods the pressure can rebuild. It's happened to me, not on the Evoque and in a petrol, fine in normal town driving, but as soon as I came off the motorway it ran really rough, that was a fuel filter.

Other than that it could be temperature related, so could be another sensor, but most sensors would throw a fault code.

Fraid i'm out of ideas after that, so please keep us informed as it sounds an unusual fault.

Good luck!
 

·
Registered
Joined
·
7 Posts
Discussion Starter #7
For the fuel, it was more that you mentioned it happened after going on the highway, obviously the constant fuel flow is highest and so a slight restriction can start to show up through loss of fuel pressure, which when revving up and down does not occur as there are periods the pressure can rebuild. It's happened to me, not on the Evoque and in a petrol, fine in normal town driving, but as soon as I came off the motorway it ran really rough, that was a fuel filter.

Other than that it could be temperature related, so could be another sensor, but most sensors would throw a fault code.

Fraid i'm out of ideas after that, so please keep us informed as it sounds an unusual fault.

Good luck!
Thanks Phil, I've found this website here More Information for STANDARD MOTOR PRODUCTS AS420 which I haven't used but friends recommend is excellent for buying sensors. I'll change the boost sensor/inlet temperature sensor and then do the fuel filter a while later to help the trouble-shooting. Appreciate the help.
 

·
Super Moderator
Joined
·
2,471 Posts
Good luck, very interested what you find.
 
  • Like
Reactions: Steve76

·
Registered
Joined
·
118 Posts
It does sound like a fuel restriction fault the way you describe it and the fact no codes coming up. As suggested try the filter and when doing that open up the filter to see if there is any dirt in there or signs of water, only needs a bit of dirt or rust etc to partially block a pipe union.
 

·
Registered
Joined
·
18 Posts
Thanks Phil, I've found this website here More Information for STANDARD MOTOR PRODUCTS AS420 which I haven't used but friends recommend is excellent for buying sensors. I'll change the boost sensor/inlet temperature sensor and then do the fuel filter a while later to help the trouble-shooting. Appreciate the help.
Hi Steve. I stumbled upon your very intriguing thread. May i enquire, what was the final outcome. If the problem persists, I have some ideas around your obd tool which could help with the prognosis.

Warm regards
 

·
Registered
2015 Dynamic Lux 2.2Sd4
Joined
·
2,585 Posts
Hi Steve,

Mine went into restricted performance mode & they replaced the Turbo (under warranty) & it seems to be sorted now.
 

·
Super Moderator
MY14 Jaguar F Type 3.0S Convertible
Joined
·
11,975 Posts
Hi Steve. I stumbled upon your very intriguing thread. May i enquire, what was the final outcome. If the problem persists, I have some ideas around your obd tool which could help with the prognosis.

Warm regards
Steve76 hasn't been on for 5 months so I wouldn't be waiting for a reply.
 

·
Super Moderator
Joined
·
2,471 Posts
Of course AnAm you could help others by elaborating on your OBD ideas...?
 

·
Registered
Joined
·
1,308 Posts
I think Steve76 is still parked on the hard shoulder of State Highway 1 🤔
 
  • Like
Reactions: Maffy

·
Super Moderator
Joined
·
2,471 Posts
If it's totally related to engine acceleration then this thread, if it's more general, then a new thread would be fine under one of the Maintenance and care topics.
 

·
Registered
Joined
·
18 Posts
If it's totally related to engine acceleration then this thread, if it's more general, then a new thread would be fine under one of the Maintenance and care topics.
A new thread under Maintenance & Care it is.

Warm regards
 

·
Registered
Joined
·
7 Posts
Discussion Starter #20
A new thread under Maintenance & Care it is.

Warm regards
Steve76 is back...

Sorry for not getting onto this sooner and AnAm - I hope this helps.

We had that bug called C19 here and I have ended up becoming a world authority on the diesel Evoque and learned a lot about the Duratorq engine in the process. Firstly the baffling engine power issue eventually was a combination of a couple of factors but 80% the fault of a faulty diesel filter I had replaced. At the end of all the work I will describe below, I had improvement but nothing that mitigated the power loss. In desperation, I ordered (from China) another filter to replace the one I ordered out of the UK and fitted 9 months earlier. I had observed while troubleshooting the situation, that the outlet pipe (which is see-through) from the outlet side of the filter to the diesel pump - had air bubbles showing in it. It would seem that air ingestion from a poorly manufactured connection was causing the diesel fuel to ingest air that eventually "vapour locked" the diesel pump and caused the power loss. Hense no OBD warnings or lights on the dash.

However, on the way to finding this very simple problem, I went down the rabbit hole of the Duratorq 2.2LT diesel engine and found that this model of engine is only fitted to two vehicles. One is the Evoque and the other is the Freelander 2. I trolled through YOUTUBE looking for any help and tried calling people in the USA to see if they had details on the Duratorq engine there. There is very little advice out there.

What I can suggest is the following:
Because I was suspicious of the wastegate being the source of the power loss due to EGR system pollution or the like and because lockdown was in full swing, I decided to remove the EGR crossover pipe that goes into the intake manifold. I found it about 30% clogged with carbon. I cleaned that, manufactured a blanking plate to block it off from some leftover aluminum, and started looking upstream at the carbon situation in the plastic manifold. In too deep already, I removed that and was astounded at what I found. When you look at the engine from the front, the inlet airflow goes into the RH side of the manifold and travels a longer distance across to the plenum on the LH side before entering the intake port and cylinder. The airflow loses its inertia heading across to the LH side and particles of carbon drop out and converts into an unholy mess of sludge and filth through the plastic intake. It took 20 litres of petrol in a bath, a couple of toothbrushes and a good hour or more to dig it out. It was pretty unbelievable.
That done I looked at the plenums and decided that I was committed to the process and started decarbonising inside the alloy housing. You can't get all the way onto the top of the valves but you can get most of the way and the mess and pollution is very surprising. Once this was all done, I reassembled the engine and started it up. After a short while idling, there was a minor fuel leak on two of the injectors where they mate to the cylinder head and the leaking diesel started to smoke. I was so small that I wouldn't have found it without the smoke. Each injector has a copper washer underneath to seal against the alloy and I guess the degreaser penetrated from the bottom up and helped that to start leaking under high discharge pressure. Off came the return lines, supply lines and the injectors were removed.

I annealed the washers and then looking at the injectors decided to give them a backyard service. I did a quick peruse of youtube and then dismantled and cleaned them with degreaser and some WD40. They had some carbon build-up but nothing too serious and in the end they showed a good pattern with just the pressure from the WD40 can.

Once reassembled the fuel leak stopped and the vehicle performance improved but did not completely abate. I still hadn't decided to replace the "old" diesel filter thinking that it couldn't possibly be a problem, so I started down dismantling the intake to the turbo and pulling off the EGR crossover at the rear of the engine. This is a complete prick of a job which involves dismantling half the RH side of the engine and timing covers and you really shouldn't try it because removing the engine is the only real way to get it off. There simply isn't enough room to work but in the end I managed to loosen all bolts and again fitted a blanking plate for the EGR. I was going to remove the electrically driven butterfly valve and secure it open (electric and vacuum-driven?) but decided just to use the blanking option due not really knowing how that part of the EGR system worked.

Once all this was done, I decided to replace the diesel filter and ended up almost where I had begun. The upside of all this work is that the Evoque has NEVER run better. The performance of the engine with the clean intake manifold, injectors and blanked off EGR is outstanding. Even the wife commented "what have you done to the car?" because it is almost a different vehicle. It completely loves not having the EGR polluting the intake and everything about the quality of the idle and cruise is better.

My next job is replacing the timing belt and water pump (just arrived from the UK) and another oil and filter change. I have some video of the work I did and if there is somewhere to upload it on here, I'll try to find time to do that.

I hope all this helps and if you want to contact me directly - [email protected]
 
1 - 20 of 22 Posts
Top