Thank you gents, the values are alot lower than mine ,SF....thank you great help......I think I may end up replacing the MAF.
I have it draining now after being sprayed with contact spray.
I will refit it when dry and test the car again with Nanocom to see if it changes.
I have read good things about doing this.

In case it does not work I have read warnings about using aftermarket MAF units...is this still the case.?
I ask as the Bosch one number 0280217532 is over £100.00 but will get one if I need one.
Thanks again ..be back soon as I have some numbers.
 
Thanks SF I will take notice of that and get a OEM one.You always give top advice.

I did the cleaning of the sensor by spraying contact cleaner in the assembly through the grill.I did it this way as I found a warning on a web site about dismantling the sensor from the assembly.

I am not sure if this is effective or wrong information and do I need to carefully dismantle it.?
My method has made no difference.

I think may be heading for a new sensor at about £140, so am trying all options.

Lately had big spends on Disco with rust proofing by Dinitrol and the front suspension area replaced , springs, turretts and shock absorbers, so cash is not plentiful. I had to have a garage do it as health prevented me doing it myself. Bit frustrating as I read on here how to do it and watched some U tube on the procedure.

I had a spring break on the drivers side where it goes in to the seating and the rest was done to keep it nice and even both sides.

On we go with sensors.!
 
IMO it's the other way around as dirt will lower the reading so the ECU will add more fuel to increase the sucction...also unplugging the MAF on a V8 is completely different than on diesels cos it doesnt go to a fixed default value to make the engine run well like a diesel cos it contains the IAT input too and it's used for stoichiometric calculations, unplugging it is not a good move for diagnostics as two inputs are missing(MAF/IAT) and the whole management is mixed up

from the V8 management description in the WSM:
" If the MAF sensor fails, the ECM implements a back up strategy which is based on throttle angle. Poor throttle
response and reduced performance will result."
....
In the event of an IAT sensor signal failure any of the following symptoms may be observed:
l Adaptive fuelling disabled.
l Idle speed adaption disabled.
l Catalyst monitoring affected due to exhaust temperature model.
l Idle speed actuator test disabled.
l Warm up ignition angle affected.
l Condenser fan hot restart inhibited"

 
Thank you for the information gents.I have been working on Disco today wittiest rides and Nanocom....Its all very odd as now Nanocom will only communicate with the SLABS ecu...I get communication error on all the rest. This has stopped work, but please see below shots taken from my phone.I found a another fault under Motronic which I missed or was not present before.I hope this may explain things.?



E94CB497-36DF-4754-9949-451D13234831_1_201_a.jpeg



9C57595E-0C9C-4EB1-9653-F931051D98E5_1_201_a.jpeg
E94CB497-36DF-4754-9949-451D13234831_1_201_a.jpeg
 
I just realised that there is a mismatch between the user guide and the unit shown by nanocom and i really believe that the shown reading is as it's described in the guide in Kg/hr not like on the display in g/s cos the MAF's description in the WSM states also Kg/hr which means that the ADC is converting it on that so the 26 reading is quite close to normal as it's technically impossible to have a 26 g/s sucction, IMO if you want to DIY you should start reading the management's decription from RAVE and nanocom guides.... here's from the guide
· MAF sensor: AirMass Flow Rate in Kilograms per hour. This reading shows the amount
of air which is being used by the engine. Under most conditions this will indicate the
current power output of the engine.
 
Last edited:
Thank you very much SF, that sorts out the low end ,but does that mean the high end foot down is not what it should be?,I get 205kg/hr AT 3000rpm from your earlier post 90-100kg/hr is to be expected.

Any tips for my Nanocom re connecting to the ECUs?,it will now only communicate with the SLABS/ABS ecu, none of the others.I get '"unable to communicate with the ecu" on the display.
thank you.
 
Have you checked the pins on the obd port? Mine was all corroded and nasty. There could be other connections on the ecus that are corroded causing connection issues
 
Yes they are good it was working fine,I took readings as above posting....went through every ECU, then drove about 10 mile home left it plugged in and when i got Home it will now only communicate with the SLABS ECU none of the others....I am confused as why this should happen.
Thanks for the input.
 
The guy who wrote those figures didnt mention if they were with stationary vehicle or while driving cos if your's is while driving and his stationary it should be OK cos according to the MAF reading curves in general they go up to10x the value under load than at idle. Unfortunately i dont have much experience with V8's but i can't imagine a failing MAF to show higher values, when they fail in most cases the reading drops or goes to open circuit... the data link failure might be a bad contact or ECU issue
 
Thank you SF i will try tomorrow and see what happens.I am not sure what else to check on the engine, if I can get Nanocom talking to the ECU.Its just odd theSLABS ecu works fine and the rest have all stopped talking to Nanocom.
So I conclude the fault must be with the car and not Nanocom.

I will update when I have an answer.
 
Hello All,
I have the problem fixed.

Thank you Sierrafery you were correct it was the MAF sensor.The car is now performing better than its ever done.It was replaced with a new Bosch one.All the error codes have now gone away....Thanks you.

You were also right about the readings on Nanocom for the MAF sensor........I contacted Nanocom and they said its an error in the software, it should read kg/hr as printed in the manual.
Thank you .
 
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