Lack of Power

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Phanc60844

Member
Posts
58
Location
Stoke on trent
Hi,
After months of sorting out my engine (TD5) and refitting it, it appears to be just as gutless as it was before the rebuild (2 big ends gone and head gasket blown). Got faults 3028, driver demand 1 high, 3143 turbo over boosting and 3170 also to do with turbo over boosting. They all clear , the first comes back immediately on restarting and using the accelerator, the other 2 only appear on a longer run. I've changed the throttle pot but no change, I've also changed the maf as that was reading 0kg/h , thought that would be sorted but overboost has come back even though it now reads 50kg or so at idle and gets bigger as I accelerate. The waste gate has been checked and is really free. Hawkeye shows 2 readings for the manifold pressure one climbs as expected the other climbs to 220+ or so then shows 100. Not sure if that is correct? The ecu plug has been cleaned and injector harness changed, any ideas?
Paul
 
Phanc60844 said:
....the other climbs to 220+ or so then shows 100....
Click to expand...
That's what overboost does... remove fuse F2 engine bay and try then... if the overboost is gone you need a new wastegate modulator though this test doesnt rule it out 100% , you must bypass it for that.
1. what engine it is Eu2 or Eu3 ?
1. EGR is still on
 
It's an EU3, the EGR is still in use. I did replace it (boost solenoid)about 6 months ago with one off ebay but I also replaced the maf off ebay and then had to buy a proper maf after the Chinese copy failed. Same with the map which was listed as genuine OEM but I have my doubts so I've bought a new one, not off ebay
 
On Eu3 the driver demand code can be triggered by low fuel pressure so do this easy test too: Check Td5 fuel pump HP , for Eu3 it's no way around if you want the engine to run well you need genuine LR MAF(the frigging expensive one) anything else is wasted money, better without it than with aftermarket... there's no such thing like ''genuine OEM" that's a scam
 
I'm starting to think that way however with the fuel pump part, why would that trigger low driver demand 1? Thought that was a direct reading off the throttle position sensor track 1? As far as I know there isnt a fuel pressure sensor, only a fuel temperature sensor?????
 
The ECU has a very complex way to "see" things and a fault code is not a live reading the fault code protocol works one way and live data readings are other story... i didnt try to find an explanation but i've seen twice driver demand fault codes logged when the pump worked only on LP so consider it a glitch(happens only on Eu3)
 
sierrafery said:
The ECU has a very complex way to "see" things and a fault code is not a live reading the fault code protocol works one way and live data readings are other story... i didnt try to find an explanation but i've seen twice driver demand fault codes logged when the pump worked only on LP so consider it a glitch(happens only on Eu3)
Click to expand...

Changed the MAP for the expensive Bosch one and all faults gone including the pedal sensor fault! Totally a different car now
 
At least we know now that a faulty MAP/IAT sensor can trigger driver demand faults as well beside the overboost which is specific for it... +1 for Stanley on this as he pointed to the sensor on first attempt :cool:
 
sierrafery said:
At least we know now that a faulty MAP/IAT sensor can trigger driver demand faults as well beside the overboost which is specific for it... +1 for Stanley on this as he pointed to the sensor on first attempt :cool:
Click to expand...
Cheers mate!
And yes, I am sure that every time we find this sort of thing out it contributes to the body of knowledge we are building up to do with the weird ins and outs of the ECUs
Sometimes I read on here about others' faults with the electrickery and I feel like a blind man with no white stick just crashing around trying to find his way. It is so good to have peeps like your good self to point us in the right direction even if the answer isn't immediately obvious.
I wonder what made the OP change his MAP though? after all the other posts.
Still he got the result he needed!:D:D:D
 
Stanleysteamer said:
I wonder what made the OP change his MAP though? after all the other posts.
Still he got the result he needed!
Click to expand...
Based on the first post the MAP sensor was one of the a suspects as you well noticed(even though not very common for overboost, more common for overall sluggishness) As the MAP was already mentioned by you i didnt concentrate further on it and i've got carried away with the driver demand fault which seems that it was just a kind of idiosyncrasy... anyway i'm glad that the OP managed to fix it without too much hassle.
 
Before anyone goes around punching the air, I changed the MAP in the first instance but still got the 3 faults. It was only when I got the hawkeye that something with the reading wasn't quite right and I suspected that the so called LandRover original part was toast. Who would have thought I'd replaced a bad part with another bad part Also no where in any forum or group has anyone linked a bad MAP to driver high demand fault. The fix has either been a replacement pedal sensor (which is what I did) or more commonly, rewiring the harness from the ECU to the sensor plug (was seriously considering it). So I'll take that one thanks
.
 
Fair play... reading the thread on my phone, I didnt see that.... ah well

My TD5 is developing the same issues, to the point it will cut off the throttle response at ever decreasing intervals. Everytime I connect the Nanocom, it seems fine, values are steady as you move the TPS. Have you checked the wiring loom for chafing between the TPS and ECU, as thats my next move...
 
Only if you are getting overboost faults at the same time. Think the ECU wasn't expecting that level of boost at that throttle position so declared that either could be at fault. I think that driver demand high on it's own cant be a MAP sensor fault
 
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