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Thread: D2a TD5 loses power at WOT on hills

  1. 20th March 2011, 04:45 PM #1
    twr7cx
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    Question D2a TD5 loses power at WOT on hills

    I have recently noticed that my 2003 Land Rover Discovery 2a (refresh) HSE TD5 automatic tranmission looses power when I'm on a hill going up at WOT (wide open throttle - while I realise that this term doesn't really apply to the diesel engine as no throttle body I'll continue to use it to represent my meaning that I have my foot flat to the floor). The first time I noticed it I was actually cruising on cruise control, and then it happened again today while I was just driving normally.
    It's weird, as it doesn't happen straight away, the vehicle will be happily chugging up the hill and then after a while suddenly power will significantly drop right off. e.g. today I was cruising along the highway, hit the hill at 110km/h, made it half way up still in 4th gear and maintaining my speed at WOT, and then suddenly power was significantly reduced and I ended up in 3rd gear struggling up at 60km/h. After the slope the vehicle seems to get all it's power back.
    On the way back I found that my not having the accelerator all the way flat (around 3/4ths instead) I don't seem to get this issue occurring. Any ideas?
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  2. 20th March 2011, 04:49 PM #2
    twr7cx
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    I just found this: TD5 Power loss problems

    Seems like I need to check the MAF sensor and turbo's wastegate modulator.
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  3. 20th March 2011, 06:30 PM #3
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    Xtreme
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    I experienced similar problems recently with 2001 D2 Td5 Auto - also surging if I accellerated hard on the flat.

    I cleaned the MAF with the spray can MAF Cleaner but no improvement so bought a new wastegate modulator ($48). Two bolts and three small hoses to replace it in about 10mins and all was fixed. Now goes better than it has for some time.

    Apparantly it is becoming pretty common for these to die and some service centres are replacing them during a major service.
    Roger
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  4. 20th March 2011, 09:13 PM #4
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    Jason789
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    Hello twr7cx,

    What's your head temp/engine temp doing??
    Seems like a coincidence.

    Cheers,

    Jason
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  5. 20th March 2011, 09:55 PM #5
    twr7cx
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    Quote Originally Posted by Jason789 View Post
    Hello twr7cx,

    What's your head temp/engine temp doing??
    Seems like a coincidence.

    Cheers,

    Jason
    No change. The temperature gauge sits on about half way mark on the gauge and rarely moves much further up or down on the highway.
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  6. 21st March 2011, 02:17 AM #6
    Panya
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    Check air intake temps with a nanocom whilst you are doing it. Turbo on full chat heats the air it can get to a point where performance is automatically degraded. If that is it it may be your intercooler. Do you notice it more when running a/c? condenser sits in front of intercooler and heats up all the air passing through that and radiator...
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  7. 21st March 2011, 07:45 AM #7
    twr7cx
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    Quote Originally Posted by Panya View Post
    Check air intake temps with a nanocom whilst you are doing it. Turbo on full chat heats the air it can get to a point where performance is automatically degraded. If that is it it may be your intercooler. Do you notice it more when running a/c? condenser sits in front of intercooler and heats up all the air passing through that and radiator...
    The last few times the air conditioning has been off.
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  8. 21st March 2011, 09:21 AM #8
    strangy
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    Quote Originally Posted by Panya View Post
    Check air intake temps with a nanocom whilst you are doing it. Turbo on full chat heats the air it can get to a point where performance is automatically degraded. If that is it it may be your intercooler. Do you notice it more when running a/c? condenser sits in front of intercooler and heats up all the air passing through that and radiator...

    While warmer air does reduce performance,the loss of performance mentioned would unlikely be related to this, engine temp would be through the roof if performance loss described was through heat.
    Coolant and oil levels would also be indicating significant variances

    Check turbo and intercooler hoses and make sure your airfilter is clear.

    cheers
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  9. 21st March 2011, 01:05 PM #9
    twr7cx
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    Quote Originally Posted by strangy View Post
    While warmer air does reduce performance,the loss of performance mentioned would unlikely be related to this, engine temp would be through the roof if performance loss described was through heat.
    Coolant and oil levels would also be indicating significant variances
    As you have pointed out it is unlikely to be the turbo running hot (unless there is some sort of fuel cut off system in place which acts when this occurs - or something else of similar means). The reason being that the performance doesn't degrade in a linear means, it's just suddenly happens (like a switch being flicked - on/off). It's likely to be something that's either moving/happening due to the hill, or something else that's moving or occurring due to the higher rpm/throttle opening or work load on the engine I imagine.


    Quote Originally Posted by strangy View Post
    Check turbo and intercooler hoses and make sure your airfilter is clear.
    Will do.
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  10. 21st March 2011, 07:20 PM #10
    bitdist
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    I have had this happen when the fuel pump was on the way out.
    I changed it and all was alright again
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