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td5 turbo does not kick in

Discussion in 'TD5' started by Jason td5, Nov 3, 2012.

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  1. Jason td5

    Jason td5 New Member

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    Got a little water in the air intake the other day and now the engine is very sluggish , seems that the turbo is not kicking in properly....

    Saw some other threads about removing map sensor , what is that
     
  2. ratty

    ratty I'm not special I'm limited edition

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    A sensor in the inlet manifold that measures the intake manifold pressure (vacuum) which in turn controls the turbo.

    http://www.landyzone.co.uk/lz/f7/removing-cleaning-td5-map-sensor-198286.html
     
  3. sabredylan

    sabredylan New Member

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    How much water?

    Did you hydrolock?
     
  4. akitadefender

    akitadefender New Member

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    did you sort it???????

    got same problem sluggish / no turbo
    maybe got water in air intake the other day
     
  5. Buckhandle

    Buckhandle Active Member

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    Ratty - you are not right. No sensor controls the turbo. The map will adjust fueling according to the inlet manifold pressure - but not the turbo itself. The turbo is an all mechanic device controlled by the waste gate.

    Lars
     
  6. ratty

    ratty I'm not special I'm limited edition

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    Maybe I should have worded it a bit betterer.

    I was putting it into basic speak.:eek:

    A gunked MAP will as you say adjust the fuelling but the symptoms presented by a gunked MAP will give the feeling of the turbo not boosting.

    As you say the turbo is controlled by the vacuum at the wastegate.
     
  7. sierrafery

    sierrafery Well-Known Member

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    no offence, i must say: Buckhandle - you are not right ... enirely :D, IMO

    cos indirectly, the turbocharger is controlled by the ECM based on sensors inputs: the waste gate gets vacuum from the modulator- the modulator is controlled by the ECM based on sensor's inputs(mainly MAP reading and AAP reading) corroborated with the fueling map and the addaptive strategy

    here is from the turbocharger description:
    just to keep things 100% accurate ;)


    and by the way ...the water in the air intake could disturb the AAP sensor which has a small hole in it's "head" and if it fills with water it doesnt read well which will affect the boost pressure cos the boost pressure is the resultant of the maniifold absolute pressure delivered by MAP with the ambient pressure from AAP substracted( Boost pressure = MAP - AAP)

    take out the AAP sensor and put use a hairdryer on it for a while, make sure no water remains within ...you can check the accuracy of the AAP pressure reading with tester ... it has to be equal with the ambient pressure shown by a barometer
     
    Last edited: Nov 30, 2012
  8. johnlad

    johnlad Well-Known Member

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    also not entirely true as the defender td5 dont have the boost modulater
     
  9. sierrafery

    sierrafery Well-Known Member

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    maybe i didnt spell well, i was speaking about this one LANDROVER DISCOVERY DEFENDER TD5 TURBO WASTE GATE VALVE PMK100130 (4676) | eBay

    on it's other name waste gate modulator...do you say defender doesnt have it? ...then what controlls the vacuum to the valve(the real valve which has the waste gate "rod" attached)?
     
  10. johnlad

    johnlad Well-Known Member

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    the valve on the wastgate rod has a small pipe tapped into the main intercooler pipe diectly without a boost modulator inbetween
     
  11. eightinavee

    eightinavee Well-Known Member

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    Quite right,and I have one customer with a TD5 Disco who has run with just the pipe from the intercooler pipe straight to the boost capsule on the turbo - for about 3 years.Works fine.
     
  12. Shifty1962

    Shifty1962 Well-Known Member

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    Johnlad is spot on with this thread.
    On the TD5 Defender the wastegate actuator gets pressure direct from the turbo outlet and self modulates. As the wastegate opens the pressure stabilises, the actuator stops opening the wastegate further. When the turbo pressure drops the wastegate starts to close and the turbo gets more exhaust gas oomph thus building more pressure which starts to open the wastegate which ......... ad infinitum. No ECU meddling. Simple.

    Why they decided to over complicate for the Disco I'll never work out.
     
  13. eightinavee

    eightinavee Well-Known Member

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    Dunno,but even worse is the electric servo rubbish on D3's etc - far more trouble and expense...
     
  14. sierrafery

    sierrafery Well-Known Member

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  15. johnlad

    johnlad Well-Known Member

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    i only knew because i took my td5 defender to a well known landy indy dealer and he sold me a boost modulator after i described symptoms to him,
    you would think they should know the cars they work on,
    alas there was nowhere to fit it
     
  16. Shifty1962

    Shifty1962 Well-Known Member

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    I would have fitted it to him where the sun dont shine ;)
     
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