TD5 Injector Balance

Robbie5.3 · Dec 11, 2017

Hi
I’m pretty new to the world of Nanocom and have recently purchased one to have a go at remapping my Defender 110 TD5 10p. I have used a company who write the map and send it across for me to load on using the Nanocom. Prior to doing the remap I sent them a log of the live data, which was said to be fine and I have gone ahead with the remap sending them another couple of logs of the live data. They have now told me that the map side of things is fine but have noticed high balance figures on cylinders 3 & 4. I questioned them asking if they’re were the same on the pre remap log to which they replied yes, a bit annoying!

I have been reviewing the balance figures and struggling to interpret exactly what they mean, If anyone has any advice on this it would be much appreciated. I have attached a copy of the logs to this post

Many thanks

Rob

neilly · Dec 11, 2017

I may be wrong, But I thought the balance was only checked when at idle.

Sadly your files are done in such a way to make looking across from the RPM to the injector balance is awkward.

Did they mention anything about the Air flow being low at idle?

Cheers

Robbie5.3 · Dec 11, 2017

Hi
Thanks for the reply
That's kind of the impression i get from doing a little forum research, sorry for the poor files, I can't seem to upload Excel files, just uploaded them with all other columns hidden so makes it a little easier.
Apparently the MAF is not used on 10p engines only on 15p?
Thanks

Robbie5.3 · Dec 11, 2017

Something i did do is total all of the balances and cylinder 3 & 4 came out the highest, I'm not sure if that is a very technical way of doing things but just trying to look for a pattern

bankz5152 · Dec 11, 2017

From what I can remember I think if they are below 20 at idle you should be fine, though I cant remember where I found said information... lol

sierrafery · Dec 11, 2017

The balances are just fine, as @neilly said they are relevant only at idle and as long they are within +/- 4 it's perfect but up to +/- 8 is acceptable, even the fuel's quality can affect them a bit or that low reading MAF

Robbie5.3 said:
Apparently the MAF is not used on 10p engines only on 15p?

Apparently is not but in reality it is used on 10Ps too but not for the main IQ calculations like on 15+P but it's reading is taken into account by the ECU in the smoke limiter maps, all the fuel maps no matter if they are Eu2 or Eu3 use the AFR(air-fuel ratio) for management, the MAF is used by Eu2s for less and by Eu3s for more but it's not completely neglected in calculations, dont expect perfect cylinder balance as long as not all the sensors are OK and in your case the MAF is not, better drive with it unplugged than with one which is reading low as your's... off course that if the EGR is still on it becomes more important

bankz5152 · Dec 11, 2017

i was VERY wrong

Robbie5.3 · Dec 11, 2017

Thanks for the replies, so the balance figures are only relevant at idle speed and mine look ok? I take it the ecu still balances the injectors throughout the rev range, but for diagnostic purposes we only use the idle figures?

I did think it strange that the MAF isn’t used at all otherwise why would they have put it there! The last log was with MAF disconnected I couldn’t feel a noticeable difference, should I have? The list of possible causes of the balance issue I was given was Cracked head, Injector plungers set incorrectly, injector seals, faulty injector or failing crank sensor. I’m pretty sure the head is ok as I changed injector washers earlier in the year and checked as best I could, also not getting any diesel in the oil. I set the plungers up so they are correct, I couldn’t comment on faulty injector as I have no way of testing but visually they looked fine. With the regards to a failing crank sensor, what sort of symptoms would you expect to see?

Thanks again for all your help

Rob

sierrafery · Dec 11, 2017

Robbie5.3 said:
With the regards to a failing crank sensor, what sort of symptoms would you expect to see?

you'll notice that for sure cos the engine will not run anymore

Robbie5.3 · Dec 11, 2017

That's what I was thinking, its the only sensor on the engine I think that if it fails will cause it not to run.

Thanks again

lightning · Dec 15, 2017

Does the engine run OK. As in starts and runs fine, doesn’t smoke, achieves 25+ mpg, no diesel in the oil or pressurised coolant etc.
And is the performance better with the remap installed?
If so it’s most likely fine and l’d stop worrying about injector maps/balance etc

Discodevon · Dec 15, 2017

Robbie5.3 said:
Thanks for the replies, so the balance figures are only relevant at idle speed and mine look ok? I take it the ecu still balances the injectors throughout the rev range, but for diagnostic purposes we only use the idle figures?

I did think it strange that the MAF isn’t used at all otherwise why would they have put it there! The last log was with MAF disconnected I couldn’t feel a noticeable difference, should I have? The list of possible causes of the balance issue I was given was Cracked head, Injector plungers set incorrectly, injector seals, faulty injector or failing crank sensor. I’m pretty sure the head is ok as I changed injector washers earlier in the year and checked as best I could, also not getting any diesel in the oil. I set the plungers up so they are correct, I couldn’t comment on faulty injector as I have no way of testing but visually they looked fine. With the regards to a failing crank sensor, what sort of symptoms would you expect to see?

Thanks again for all your help

Rob

Another reason for injector imbalance is low compression on one or more cylinders... I don’t wish to scare you but if she’s starts well in the cold I highly doubt it will be compression

Brown · Dec 15, 2017

It's possible to have a faulty crank position sensor and have the engine still run. in the later part of 2013 I was getting Nanocom errors such as 'high speed crank error' as well as occasional sudden transitions into limp mode when driving at about 70. A new crank position sensor cured all this, plus got rid of some high cylinder balance values. Once the non-Britpart sensor was installed it was as if the engine had been overhauled.

TD5 Injector Balance

Robbie5.3

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neilly

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sierrafery

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sierrafery

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