Disco 2 TD5 rough above 3000rpm

Discodevon · Nov 5, 2018

Hi I had this, after much money spent it was the exhaust manifold that needed skimming

Discodevon · Nov 5, 2018

Oh and by the way unplug your Maf sensor then try

cj_uk · Nov 6, 2018

Fery, would that data be captured when recording the instrument data, containing Turbo pres. (kPa), Ambient pres. (kPa), Air flow (g/s) or are is the fuelling data on another screen ?

cj_uk · Nov 6, 2018

Hi Discodevon, I'm not getting any whistling noises from the exhaust manifold. The MAF was changed around 6 years ago for a genuine one, the live data I've captured seems to show that its working, ranging from 60 to around 300. But I maybe wrong

sierrafery · Nov 6, 2018

cj_uk said:
Fery, would that data be captured when recording the instrument data, containing Turbo pres. (kPa), Ambient pres. (kPa), Air flow (g/s) or are is the fuelling data on another screen ?

In Inputs fuelling, put SD card in nanocom, save on it, download to PC and convert to excel

cj_uk · Nov 6, 2018

Hi Fery, thanks for the info, I'll grab the data at the weekend and will post it

johnlad · Nov 6, 2018

If your maf readings only reach around 300 the maf needs changing, whilst booting it it should be in the region of 600.

cj_uk · Nov 6, 2018

Sorry, my mistake, the MAF readings go up to around 571

MungoPark · Nov 6, 2018

I have had this exact issue with my 10p TD5 in my Defender. I was reluctant and pretty uncomfortable when taken above 3000rpm.
I had the clutch and DMF changed a year or so ago and since then it has been fine. I did write a post on it a while back but the search function just returns an error.

Probably not what you want to hear, but it was chalk and cheese.

cj_uk · Nov 7, 2018

That's really interesting MungoPark, I know the clutch has never been changed, well according to the full history I've got. I do notice clutch judder whilst the engine is cold, so perhaps the DMF is on the way out.
I'm looking at changing my gearbox next year as fifth gear is whining, more so this year than ever, so I planned to change the clutch then. I do an oil change every year, engine, boxes and axles regardless and only use genuine mtf94.

MungoPark · Nov 7, 2018

I think changing the DMF when doing the clutch would be a good idea in any case. But I feel it may solve your issue.

I found the post, it reminded me just how much of a 'circus' mine was before the DMF change.

https://www.landyzone.co.uk/land-rover/discovery-box-in-a-td5-defender-my-experience.309016/

cj_uk · Nov 7, 2018

Thanks Mungo, interesting read. Yes its false economy not to change my clutch when I do the gearbox. I'm going get the box from Ashcroft and have a V8 fifth gear installed to help with the motorway runs I do.

Discodevon · Nov 8, 2018

Mine wasn’t whistling either but that was it, you should try unplugging your maf anyway just to rule it out

cj_uk · Nov 12, 2018

Well, I've got the fuelling file but it won't upload. I've tried zipping the .xlsx file but it won't upload

cj_uk · Nov 13, 2018

Here's a extract (via snipping tool):

cj_uk · Nov 13, 2018

And another :

cj_uk · Nov 13, 2018

And another, hope this of some use:

sierrafery · Nov 13, 2018

Nothing obviously wrong in the readings, that roughness above 3000rpm is present stationary too or just while moving?... Do you stil have EGR?

cj_uk · Nov 13, 2018

Hi Fery, thanks for looking and commenting. No there is no roughness when stationary and only seems to be rough when over 3000rpm in mainly 3rd and 4th gear. I have got a whining noise in 5th gear from the gearbox

sierrafery · Nov 13, 2018

Then you can rule out a management issue IMO, might be the DMF or something mechanical which exceeds my knowledge

Disco 2 TD5 rough above 3000rpm

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