td5 turbo does not kick in

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Jason td5

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36
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
 
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
 
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

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.
 
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

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:
RAVE said:
The engine control module controls the amount of boost pressure the engine receives by way of the turbocharger.
When full boost is reached a control signal is sent to the wastegate modulator, and a vacuum is applied to the
wastegate valve. The wastegate valve opens, bypassing some of the exhaust gas away from the turbine to be output
to the exhaust system
.

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:
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

also not entirely true as the defender td5 dont have the boost modulater
 
the valve on the wastgate rod has a small pipe tapped into the main intercooler pipe diectly without a boost modulator inbetween
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.
 
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.
 
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.
Dunno,but even worse is the electric servo rubbish on D3's etc - far more trouble and expense...
 
sorry:eek:, i dunno much about defenders, and i didnt realise that this thread is about a defender (starting from the first post) ... strange is that for that part number (PMK100130) not just the ebay seller but some specialised stores are listing it as suitable for Defender too...e.g (see "Applicable models") PMK100130 DISCOVERY TURBO WASTE GATE VALVE ASSY | Discovery 2 1998-2004 | shop | www.lrseries.com | L. R. Series :confused:

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
 
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