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  #1  
Old April 24th, 2013, 01:20 PM
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Chris
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turbo diagnostic

Hey.

I have a 300tdi defender 90. A few months ago I started to have problems with my turbo.

It sounded like it was spooling very early then when I expected boost there was a "hole in the exhaust" style blowing noise. There was a small amount of exhaust gases leaking in the engine bay.

I have checked all boost pipes connections. . All tight. Last weekend I had the manifold off and put 1 bar of pressure on the actuator and it opened fine. Then I checked the intercooler which is also fine with no leaks. ..

I'm now stuck and don't know where to go. .... other than a garage. Any help would be appreciated.
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  #2  
Old April 24th, 2013, 01:41 PM
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John B.
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are you saying you are getting no boost, or not enough? The wastegate could be leaking.
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Old April 24th, 2013, 01:49 PM
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Chris
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How can I check the wastegate? (I assume you mean the valve with the manifold) but it seemed to be closing and opening with the actuator.

With regards to the boost... I don't think the turbo is building enough pressure to reach the 1 bar required as the pipe to the intercooler can be squeezed easily
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  #4  
Old April 24th, 2013, 01:51 PM
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I'm guessing you have no gauge. You can't build boost with the vehicle parked. You need to drive it under full throttle to produce boost.
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Old April 24th, 2013, 01:52 PM
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Chris
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No I don't have a tester. .but with the manifold off I was able to check the actuator and valve. ..and when driven there is no boost.
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  #6  
Old April 24th, 2013, 01:57 PM
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How do you know there is no boost if you do not have a boost gauge?
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  #7  
Old April 24th, 2013, 02:10 PM
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Chris
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It is down on power and when the turbo should be spooling to boost there is no power difference. But these are assumptions. . I welcome any other thoughts as I am stuck!
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  #8  
Old April 24th, 2013, 02:25 PM
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You can't figure out anything without a gauge. Fueling could be low, timing could be off, the turbo could be bad, there could be a boost leak, the wastegate might not be sealing.... Troubleshooting needs to happen.

Is it smoking under full acceleration?
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  #9  
Old April 24th, 2013, 02:40 PM
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I don't think fueling is low. .as there is no coughing in the engine.

Timing belt was recently done.

How do I check the turbo. . The fins look Ok and there is small movement in the shaft (for the oil float) and no movement perpendicular to this.

There is a bit of smoke, but once it has burnt through it goes clear but smoke builds up much quicker.
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  #10  
Old April 24th, 2013, 02:51 PM
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John B.
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If you don't have boost there should be smoke... If not, fueling is too low. Fuel is needed to make the turbo boost.

Recent timing belt does not guarantee correct timing.

You need to put on a boost gauge first and drive it, then report back.
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