Power loss on higher altitudes

ystaspinar · Aug 9, 2019

hi,
I have a Discovery 2 with TD5 engine, 243000 km on the clock, I own her for 3 years. From the first day I own her, Power Loss on high altitude is big problem. İt starts from 700 meters, and increase mucher on higher altitudes. At 2000 meters and above I had to unplug the maf sensor or set the low range for drive. I changed the Maf, Map, crank sensor and Aap sensors as well. I have no chance to connect nanocom etc. My mechanic have a software for pc Delphi. There is not any fault code about engine. My egr walve is off. No oil in ecu and injector loom. I changed the injector loom harness. I cleaned the intake manifold. I changed all the seals. But still there is power loss on high altitudes. I will lose my mind. Maf sensor is siemens. Aap sensor is delphi. Dont remember map sensor. Not original parts cause this problem? What is your opinions? Pleaese find a way...

Thor 1950 · Aug 9, 2019

ystaspinar said:
hi,
I have a Discovery 2 with TD5 engine, 243000 km on the clock, I own her for 3 years. From the first day I own her, Power Loss on high altitude is big problem. İt starts from 700 meters, and increase mucher on higher altitudes. At 2000 meters and above I had to unplug the maf sensor or set the low range for drive. I changed the Maf, Map, crank sensor and Aap sensors as well. I have no chance to connect nanocom etc. My mechanic have a software for pc Delphi. There is not any fault code about engine. My egr walve is off. No oil in ecu and injector loom. I changed the injector loom harness. I cleaned the intake manifold. I changed all the seals. But still there is power loss on high altitudes. I will lose my mind. Maf sensor is siemens. Aap sensor is delphi. Dont remember map sensor. Not original parts cause this problem? What is your opinions? Pleaese find a way...

Air filter. there might be a high flow filter for high altitude driving

ystaspinar · Aug 9, 2019

Thor 1950 said:
Air filter. there might be a high flow filter for high altitude driving

Thank you for answer,
I don’t have any idea about high flow filter. Can you tell more about it? İs there a different type of filter for high altitudes?

Thor 1950 · Aug 9, 2019

ystaspinar said:
Thank you for answer,
I don’t have any idea about high flow filter. Can you tell more about it? İs there a different type of filter for high altitudes?

Well what I did was put in a high flow K&N high flow air filter. Now I used what they call a dry 1. This 1 meets and exceeds factory specs for dust/dirt filtration. The ones with a oil coating will mess up your map sensor. For every 1000ft you lose 3% of rated HP. so anytime you can get more air to the engine is a benefit. Also make sure your fuel filters are in good condition also.
For a more technical Just google as a search engine to answer alot of questions and recommendations

ystaspinar · Aug 10, 2019

Thank you for advice. I will. Actually 1000 meter is not really high, maybe for UK it is high, But I think it has not lose power after 700-800 meters. 1500 maybe, 2000 truely. Can chip tuning be a solution?

Thor 1950 · Aug 10, 2019

ystaspinar said:
Thank you for advice. I will. Actually 1000 meter is not really high, maybe for UK it is high, But I think it has not lose power after 700-800 meters. 1500 maybe, 2000 truely. Can chip tuning be a solution?

good question. I don't have a good answer for. But there could be negative effects. Maybe the is a chip master who good speak up

Discodevon · Aug 10, 2019

I would unplug you’re maf and see if the problem is better

ystaspinar · Aug 10, 2019

Discodevon said:
I would unplug you’re maf and see if the problem is better

I try it and it works. When unplug the maf, disco becomes a tiger. But my maf sensor is brand new.

sierrafery · Aug 10, 2019

ystaspinar said:
have a Discovery 2 with TD5 engine

the first information is insufficient... is it Eu2 or Eu3? also manual or auto?

ystaspinar said:
I try it and it works. When unplug the maf, disco becomes a tiger. But my maf sensor is brand new.

Bran new what?

ystaspinar said:
Maf sensor is siemens.

Ok i get it, so it's a fancy aftermarket which failed the LR tests to be genuine but still ISO compliant or made in the back yard of the factory... read this https://www.landyzone.co.uk/land-rover/d2-td5-cutting-out-when-warm.326582/#post-4193511
....
if your engine is Eu3 you need a Genuine LR MAF or better drive without it on default and be a ''tiger''... or it can be a short in the harness and a new one would cure things... i mean main engine harness not injector loom

If i was you i'd bite the bullet and buy the genuine LR MAF ... as long as it's not ruled out the whole thing is a lottery especially that the engine runs well with it unplugged

Discodevon · Aug 11, 2019

As mentioned believe it or not it is a good idea to buy genuine, all after market ones are dog crap, and the Siemens vdo is ok but not brilliant... one issue is with the price the genuine is over £100 pounds.. I purchased my genuine one in 2016 and it still works brilliant so worth it in the long run

Power loss on higher altitudes

ystaspinar

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Thor 1950

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ystaspinar

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Thor 1950

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ystaspinar

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Thor 1950

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Discodevon

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ystaspinar

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sierrafery

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