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Turbo not kicking in - loss of power!

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by VTEC_Killer, Oct 23, 2012.

  1. VTEC_Killer
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    VTEC_Killer Member

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    [Oct 23, 2012]
    Car was running ok this morning, then it felt that there was no 'surge' as if the Turbo wasn't kicking in.

    Continued on my journey for 8 miles (mainly flat, so no big issue) but as soon as I got to a hill, the car was in limp mode - no power at all to climb the hill (car really struggling)

    Anyway, I switched the engine off as soon as I got on the flat, started up and then things were like back to normal again - the turbo was working ok!

    I did a quick search on the forum, and the MAF Sensor/N75 seems to be the main cause (though I will try to get it on VAGCOM).

    Q's?

    Where is the MAF and n75 sensors located and can I replace these myself?
    What will be cost?
    How do you best clean the turbo with Mr Muscle?

    Thanks in advance.
    #1
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  3. dplovin
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    dplovin Member

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    [Oct 23, 2012]
    The maf and n75 are at the top of the engine ill take a pic for you later. Both easily replaceable mate and not too exspensive
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  4. dplovin
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    dplovin Member

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    [Oct 23, 2012]
    Maf around £50 and n75 £40 I think last time I bought one. But that was for a 1.8t s3
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  5. moggie93
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    moggie93 Member

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    [Oct 23, 2012]
    Maf sensor is on the air box. N75 valve is on the front of the engine. Just follow the vacuum hose from the turbo actuator . N75 valve is just under £40 from stealers. Have a search for the mr muscle turbo cleaning post. I've recently done both and it's cured my llimp mode problems.
    M
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  6. stu_m
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    stu_m Active Member VCDS Map User

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    [Oct 23, 2012]
    forget looking at parts and prices till you have done a scan and you know what you need :confused:
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  7. VTEC_Killer
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    VTEC_Killer Member

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    [Oct 24, 2012]
    Update:

    Drove the car home yesterday, no problems - everything seemed to be ok.

    Got it on VAG, no engine codes detected except for some unsual ones from con unit, so all good there - cleared codes, went for a blast, re-test - all good!

    Drove in this morning, no issues.

    Pretty weird, I think! I guess I'll see how it goes over the next few days/weeks.
    #6

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