Hello

I am having some problems with my new (to me) TDV8. It has done 75k for reference 2010MY

When cold it sometimes idles very roughly, this tends to clear up as it warms up. When sitting stationary it often comes up with the restricted performance warning. This goes away as soon as you move off again. The warning never comes on in any other instance.

The only other symptom is slight hesitation when accelerating from a standstill.

We have pulled the codes and checked the live data. The code is an imbalance between bank 1 and 2 on the air flow. Watching the live data one bank was reading 40k at idle and the other 7k. Revving up and down caused this to fluctuate and then sometimes the readings lined up (going into a default?). The codes indicated an error with MAF sensor on Bank B so I have changed that but it has had no effect.

EGR, fuel and injectors etc all have very close correlation between the two banks so it looks to me like it must be air flow related.

I took both top intercooler hoses off but can not see any splits, having said that the passenger side one is partially covered in a protective material so I can't fully inspect it. Should I cut this off? Both of these hoses do seem quite soft, although they don't flatten when revved at idle.

Has anyone got any ideas please?


Thanks

Sam

What about the turbos and their actuators ? MY 2010 5.0 SC Galway green and sand interior!!
Have the Faultmate MSV2 Extreme to be tinkering with the settings etc. !!

Haven't checked those yet, but would I be getting such a massive difference in MAF values whilst at idle?

How can I get to/check the actuators?

just had a quick look and apparently theres an idle control valve if you have already changed out the MAF in the airbox that would be my next call ,Have you tried swapping over the maf plugs to see if the fault transfers itself L322 2008 vogue
R53 Cooper S Works tuned beyond the works SOLD
R33 Nissan Skyline in rebuild 400bhp atw

The plugs don't quite reach to swap over ! But yes I have swapped the two MAF sensors across but the fault persists. Thank you for looking though

I now have the following two fault codes (there were more before)

P007F Charge Air Cooler Temperature Sensor - Bank 1 and 2 Correlation
P0113 Intake Air temperature Sensor 1 Circuit High Input

IS the temperature sensor incorporated into the MAF sensor or are there separate sensors. if so is there one on each bank?

Generally a mMAF works on the hotwire principle i.e it sits at a certain temperature and as air passes over it cools it the wire and the voltage difference tells the ecu how much air is being sucked in ,I just had a look at the schematics and it looks like the temperature sensor is separate it might be worth checking your earth points as well as it seem to be jumping from one thing to another L322 2008 vogue
R53 Cooper S Works tuned beyond the works SOLD
R33 Nissan Skyline in rebuild 400bhp atw

Do you have a part number for the Sensor? Is it before or after the Intercooler?

Thanks

Sam

On the TDV8 the manifold temperature and pressure sensor is combined. Take off the plastic engine cover and you will see them toward the front of the engine, one on each intake manifold. You should pull them out and check for gunk. Don't touch them and if you do clean them so so with electronics-friendly cleaner.
Or use brake cleaner like I do. At your own risk

the passenger side one tends to split under the protective layer, worth pulling it back to have a look. There is nothing that can't be fixed with a hammer😜😜
FFRR 4.4 SDV8 Autobiography Santorini Black.
Fiat 500x 1.4 multiair Lounge 2015
2010 LR D4 Commercial 2.7 TDV6

Pulled the sensors and the passenger one was covered In black gunk. Drivers one fairly clean

I cleaned up with contact cleaner but it is no different. I guess this sensor has failed and the abnormal readings caused the gunk build up from the rough running?

Intercooler hose on that side perfect with no splits

Update

Whilst I still get a restricted performance warning when warm and idling the difference to the car on my drive to work this morning was amazing

Very smooth acceleration and better response than before. There was also no lumpy idle at any point.

I guess the badly gunked sensor had partially failed and is still giving out of range readings. Island 4x4 are doing a deal on them at the moment for £25 plus the dreaded each. Have ordered two at £66 delivered for some peace of mind

Looking on the Disco 3 forum lots of people have taken out the MAP sensor to find it gunked up like mine, and then cleaned it to find better throttle response and some have found up to 20% better MPG.

Go and check your MAP sensors for gunk! Literally 10 minutes work

Well an update to this story....I drove the car to Wales on Friday, towing for part of the journey (250 miles) and all seemed well.

On the return trip all was well for an hour and then the car started juddering and we got the restricted performance warning whilst cruising at 70mph. I had never got the warning at anything but idle before.

It cleared and we carried on, then it did it again and we lost all power, cleared but did it again shortly after so I called for the AA

The codes present are

P007F Charge Air Cooler Temperature Sensor - Bank 1 and 2 Correlation
P0113 Intake Air temperature Sensor 1 Circuit High Input


On reading was miles out from the other (both of those sensors on the intake were changed as per my earlier post). I have check all hose we can get to. The Turbo actuators were swept with Autologic boost pressures match on each side when viewing live data.

The car will barely move under its own power now and throwing out lots of smoke. Any ideas on where to start?

if it's throwing out lots of smoke i would say it's over fueling would would correlate with the sensor reading being high ,just because you have changed them doesn't mean they haven't failed I"ve had it at work a load of electronic valves get delivered and one or two don't function properly L322 2008 vogue
R53 Cooper S Works tuned beyond the works SOLD
R33 Nissan Skyline in rebuild 400bhp atw

Quote:

Watching the live data one bank was reading 40k at idle and the other 7k

Quote:

The code is an imbalance between bank 1 and 2 on the air flow. . . . . . Revving up and down caused this to fluctuate and then sometimes the readings lined up (going into a default?).

The sensors are the same on both sides so I tried swapping them over to see if the fault also moved from one to the other but it didn't

Where are the throttle bodies? (I must admit I didn't expect a diesel to have a throttle body but I can see from a google search that I am wrong!)

Do you think the throttle body is sticking?