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Thread: Q7 3.0tdi bug no start

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  1. Re: Q7 3.0tdi bug no start 
    #11
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    Check that the red/green wire to the N276 fuel pressure regulating valve has ignition live power, if not check fuse 10 in the engine bay fuse box is OK and that it has power, if it does not have power, check the J317 relay at position C2 is operating and if not, use a fused bridge to jump between terminals 30 and 87 of the relay (sockets 1 and 2 on the board) and then see if it starts.




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  2. Re: Q7 3.0tdi bug no start 
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    Hi I am getting 12.5v to the red/green wire. Whilst I had the plug of I tested the sensor with a multimeter.

    Due to awkward angle I had to extend my probes with some wire and used the 6.1 settings shown in the manual
    meter settings.jpg

    Tested it using this info below from this webpage working range should be between 25-35ohms. I was getting 0 ohms with a beep for continuity. If I tried it with just turning to the resistance setting and not pressing any of the other buttons it would jump all over and not give a definitive reading.
    n276 test.jpg

    based off that would you recommend replacing the n276. I have seen one on eBay that comes with the pressure sensor also at around £90

    thanks
    Last edited by Smudger_Q7; 20-05-2022 at 03:52 PM. Reason: further info added
     
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  3. Re: Q7 3.0tdi bug no start 
    #13
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    How does it sound when cranking, smooth as if just spinning or pulsing as each cylinder compresses? Take the intake off the turbo and check the compressor play and free rotation.
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  4. Re: Q7 3.0tdi bug no start 
    #14
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    Hi it pulses when cranking. Thinking timing is okay as the start correlation is usually 2.0-4.0 so don’t think the timing has moved

    No play in turbo! Rotates freely
    Last edited by Smudger_Q7; 21-05-2022 at 11:01 AM.
     
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  5. Re: Q7 3.0tdi bug no start 
    #15
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    It looks like the sensor is faulty but I don’t think it will prevent the engine starting
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  6. Re: Q7 3.0tdi bug no start 
    #16
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    If it not likely to be the n276, where would you look next? Is there anything I could log to give you any insights?

    Is it worth replacing the valve anyway?
     
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  7. Re: Q7 3.0tdi bug no start 
    #17
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    On any common rail systems if the fuel pressure regulator is not being energised by the ecu pin no ??? the fuel goes strait back to tank If you back probe this sensor not connected to ecu & you get 12vs either side then its checking out. The regulator & the fuel pressure control valve are inter connected
     
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  8. Re: Q7 3.0tdi bug no start 
    #18
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    N276 Pressure relief valve has 12.5v on its feed wire or do you mean check for power at the n290?
     
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  9. Re: Q7 3.0tdi bug no start 
    #19
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    Hello all not posted for a while and still struggling with this non start.

    Have had the inlet off to check the n290 and it looks clean (earlier type with no basket)

    Inlet manifold flaps working as expected

    Egr pipe to intake removed to see if there was an exhaust blockage

    Pulled all glow plugs and cranked over to see if I had a flooded cylinder (nothing out glow plug holes)

    Still no change

    I do have 6 used injectors and a washer kit to fit. Just wondering if any has any other advice any more ideas or guidance is still much appreciated

    Thanks
     
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  10. Re: Q7 3.0tdi bug no start 
    #20
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    Have you tried giving it a sniff of brake cleaner?
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