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Thread: 2007 Audi A4 2.0 TDI, Turbo Boost Related Issues

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  1. Re: 2007 Audi A4 2.0 TDI, Turbo Boost Related Issues 
    #11
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    Thanks for the message, I suspected as much. Bring on some dry weather to do the strip down! Cheers Tel
     
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  2. Re: 2007 Audi A4 2.0 TDI, Turbo Boost Related Issues 
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    Well seeing as it’s already been revived...

    I’ve got a BRE engine which yesterday started behaving oddly, no lights on the dash and no early symptoms but anything over 1/4 throttle does nothing apart from throw smoke out of the exhaust unless Iim around 2k rpm. Car was mapped almost a year ago and has been perfect since bar a faulty MAP sensor.

    I’ve checked the flexy boost pipes between turbo and manifold and can’t find any splits guessing it could be a vacuum line split but will have to wait for it to cool down to check properly. Any other thoughts on what it could be?
     
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  3. Re: 2007 Audi A4 2.0 TDI, Turbo Boost Related Issues 
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    Possibly a sticking EGR valve, even though you have no warning light on, with that symptom I imagine a code will be stored.
    Anthropogenic climate change, the biggest con inflicted on mankind since religion...

    Slava Ukraini
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  4. Re: 2007 Audi A4 2.0 TDI, Turbo Boost Related Issues 
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    Thanks Crasher I’ll have a look at the codes tonight. No signs of any split vac pipes they’ve still got vac and the actuator moves freely. Out of interest is the hard boost pipe that runs across the front of the car a common failure or are they fairly robust?
     
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  5. Re: 2007 Audi A4 2.0 TDI, Turbo Boost Related Issues 
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    Never known one fail, on that engine I have seen the G28 crank sensor come up as an error but it is a red herring, the problem is actually condensation inside the EGR valve electrics.
    Anthropogenic climate change, the biggest con inflicted on mankind since religion...

    Slava Ukraini
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  6. Re: 2007 Audi A4 2.0 TDI, Turbo Boost Related Issues 
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    Just read the codes and got P0404 EGR “A” Control circuit range/performance, I presume that points towards an EGR that’s either clogged up or got a wiring/electronic issue
     
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  7. Re: 2007 Audi A4 2.0 TDI, Turbo Boost Related Issues 
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    Often the motor is full of oil.
    Anthropogenic climate change, the biggest con inflicted on mankind since religion...

    Slava Ukraini
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  8. Re: 2007 Audi A4 2.0 TDI, Turbo Boost Related Issues 
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    Quote Originally Posted by Crasher View Post
    Often the motor is full of oil.
    The EGR was indeed very clogged up, cleaned both that up and most of what I could get out of the manifold, cleared the code but it’s still behaving the same as before and after having driven it it’s got the same fault code again P0404

    Seems completely randomly it will pick up perfectly fine as normal and then power will just tail off and it feels like it’s being held back
     
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  9. Re: 2007 Audi A4 2.0 TDI, Turbo Boost Related Issues 
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    Did you take the cover off the motor and check for stripped gears and oil contamination. When you take the cover off, put some cloth under it (not toilet paper, too valuable) as they can hold quite a lot of oil.
    Anthropogenic climate change, the biggest con inflicted on mankind since religion...

    Slava Ukraini
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  10. Re: 2007 Audi A4 2.0 TDI, Turbo Boost Related Issues 
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    I didn’t, can’t say I even thought about that to be honest, I should have a whole spare EGR I can try to rule it out though
     
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