Low Rev Throttle Response, at a loss now!

This site contains affiliate links for which LandyZone may be compensated if you make a purchase.
A couple of updates,

ECU seems to be at fault, the diagnostics they use in the LR garage is kicking out what they're calling FFFF's errors dictating that its both faulty and also incapable of supplying much of the diagnostic data that the Nanocom cannot offer - so a replacement is en-route after which is can go back in for further digging.

Just something interesting, I read the injector codes using the Nanocom, got the following, interestingly, this seems to be from an NNN ECU?

Injector 1; NMBMF
Injector 2; LFNLM
Injector 3; LFNBM
Injector 4; NBFEF
Injector 5; NCBCF

According to the Nanocom manual older MSB ECU’s all end in A = 0 or 3 B = 1 C = 2 with the corresponding alterations for changing alpha to numeric.

I changed the values in line with it possibly being an NNN inside an MSB case to the following inline with their instructions, and it seems to be more responsive….…or am I way off the mark <likely>!:

Injector 1; NMBM2
Injector 2; LFNL8
Injector 3; LFNB8
Injector 4; NBFE2
Injector 5; NCBC2


I'll update again when the replacement ECU is installed.

Latest Nano Log
 
tweedandbriar said:
... and also incapable of supplying much of the diagnostic data that the Nanocom cannot offer...
Click to expand...
that^^ that seems a load of b0ll0cks to me(from theyr's side) cos there is no tool whatsoever able to offer more than nanocom for Td5 engine management diagnostics... not even the main dealer's T4 or Autologic... ... as long as the ECU is communicating with the scanner they should tell you the codes which made them blame the ECU unless they're full of sh... , the only codes pointing to a Td5 ECU fault are "topside switch failure" codes
 
Last edited:
tweedandbriar said:
I changed the values in line with it possibly being an NNN inside an MSB case to the following inline with their instructions, and it seems to be more responsive….…or am I way off the mark <likely>!:

Injector 1; NMBM2
Injector 2; LFNL8
Injector 3; LFNB8
Injector 4; NBFE2
Injector 5; NCBC2
Click to expand...
That's completely wrong... you have to remove the cover and see the real codes which are on the injectors...if they are green tops with the codes prviously saved then that's it but changing the last character just to match with what an EU2 ECU would accept is silly... if they are black tops with other codes those codes should be saved... if the ECU has a replaceable chip it's definitely not NNN
 
sierrafery said:
that^^ that seems a load of b0ll0cks to me(from theyr's side) cos there is no tool whatsoever able to offer more than nanocom for Td5 engine management diagnostics... not even the main dealer's T4 or Autologic... ... as long as the ECU is communicating with the scanner they should tell you the codes which made them blame the ECU unless they're full of sh... , the only codes pointing to a Td5 ECU fault are "topside switch failure" codes
Click to expand...
Okies.... 😬
 
sierrafery said:
That's completely wrong... you have to remove the cover and see the real codes which are on the injectors...if they are green tops with the codes prviously saved then that's it but changing the last character just to match with what an EU2 ECU would accept is silly... if they are black tops with other codes those codes should be saved... if the ECU has a replaceable chip it's definitely not NNN
Click to expand...
Okies x 2 😬

So how would one know for sure an ECU is faulty per se?
 
So, here's the latest update for those who may be following:

Replacement ECU installed...absolutely remarkable difference!!! Noticeably:

Starts quicker
Runs MUCH more smoothly
Accelerates smoothly and the throttle response is noticeably more sensitive (but not that horrible previously aggressive kind)
MPG at first glance seems better
ZERO bunny hopping and jerking
Can now creep vehicle at low speeds with no need to raise revs to avoid jerking
No more surging

I also had excess slap in drive chain addressed with new half-shafts. Still a little noise from the clutch when cold, but only very temporarily - likely spigot, but not a biggy!

Essentially a different vehicle

I would very much like to give a shoutout to MASTAZ for their absolutely sterling customer service, a refreshing experience I have to say!
 
sierrafery said:
Important is that you are pleased ... though i'm curious, did they send you back the ECU which was presumably faulty if you paid for a replacement?
Click to expand...

I still have the 'faulty' ECU and the new one was a replacement. I appreciate your question, all I can tell you as a non-expert regarding ECU's is that the original one, despite two attempts never resulted in anything like the changes I have listed. The new one speaks for itself. The initial chap, is a 40-year veteran re all land rovers, he won't touch other vehicles. He is used by pretty much everyone I know that has a Landy including all the local farming community....his opinion is very much valued. MASTAZ also sent me their ECU without payment on the premise that if it addressed the issues then pay - I really can't fault that!
 
Good to know cos i've never seen a faulty ECU to deliver correct data to nanocom and not have a specific fault code for that... at least i learnt something new and next time i'll see such oddity i will not rule out 100% the ECU... while it's still possible that the replacement ECU has a better fuel map and that's the cause of the improvement
 
Last edited:
sierrafery said:
Another curiosity... do you know the actual(physical) codes on your injectors(not what nanocom shows)? and what are the p/n of both ECUs? (MSB......)
Click to expand...

Not bothered re' the injector codes as currently of the opinion to 'let sleeping dogs lie'... Both ECU's are MSB (if thats what you’re asking). It might well be that the replacement has a more efficient map, don't suppose I'll know now. What I might do as an exercise is see if MASTAZ would have a look at the 'faulty' one and report back. I don't want to push the envelope with them as they have been so good.
 
To sum up for others:

Symptoms:

Low throttle response
Little power and reduce torque up hills
Very jerky at times producing annoying and uncomfortable 'Bunny Hops'
Sporadic surging and overtly aggressive driving

Stuff I changed other than the usual checking for oil in injector loom and inside ECU:

Air Filter
MAP Sensor
MAF Sensor
Fuel Filter
Throttle Loom replaced - Walkthrough Here
Run some Hydra DPB 100 through - Link Here
Halfshafts replaced (not to address the above symptoms, but needed doing to reduce excess lash)
Experimented with Wastegate Actuator length, all to no avail
Changed injector loom and gasket

Had two remaps to existing ECU, one was VERY fast, but lots of smoke and didn't address kangerooing issues and the second was a little better, but could not get over 50mph. I got a complete refund.

Took it into LR specialist who suggested a duff ECU (possibly controversial :rolleyes: ) but a trusted and experienced chap

Got a replacement ECU from MASTAZ - Their Site Here

With the risk of speaking too soon, mission accomplished - see post here: Outcome

There's nothing more irritating than a lack of an outcome to threads, so I hope this relatively long thread is of help to others.
 
Good outcome. You have worked hard to get to the issue causing the problems. Your LR specialist was able to interpret what the diagnostic readings were telling him and transfer that to solid advice for you.
Well done.
 
Last edited:
You must log in or register to reply here.

Similar threads

tweedandbriar
Flat Spot at low revs...
Replies
4
Views
336
tweedandbriar
tweedandbriar
tweedandbriar
More responsive after a short drive
Replies
10
Views
487
lynall
L
J
Smoking and low power.
Replies
13
Views
334
JCP123
J
F
P38 DSE loss of power when driving
2
Replies
33
Views
1K
Mark Piercy
Mark Piercy
MalcolminSpain
To a TD5 from a V8
Replies
10
Views
961
MJI
MJI
Back
Top