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Thread: td5...overboost, no guts and i'm at a loss

  1. 29th November 2013, 03:45 PM #1
    Pepi
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    td5...overboost, no guts and i'm at a loss

    Hi All,

    i have been having problems with no guts under acceleration and then what seems to be overboosting when turbo kicks in.
    i have read countless threads and as a result have changed:
    new maf sensor
    new injector loom
    new wastegate modulator
    cleaned oil from red ecu plug(non there now)
    new fuel filter
    cleaned mas, crank angle and aap sensors
    i have checked all hoses on intercooler and turbo including wastegate hoses.
    egr removed

    nanocom arrived yesterday and i had a driver demand fault logged.
    have reset this and it hasnt returned.

    problem is still there but have no logged faults.

    i have saved live data from the nanocom and was wondering if someone would please be able to help diagnose any faults or see if anything is out of the ordinary.

    i was thinking it could be tp sensor (driver demand fault) or fuel pump.
    any help would be greatly appreciated.

    regards
    Pete
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    Last edited by Pepi; 29th November 2013 at 03:51 PM. Reason: update info
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  2. 29th November 2013, 03:49 PM #2
    Pepi
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    nanocom...engine at idle reading

    here's another reading of engine at idle if it helps?
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  3. 29th November 2013, 05:56 PM #3
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    bob10
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    Fuel filter? Bob
    I’m pretty sure the dinosaurs died out when they stopped gathering food and started having meetings to discuss gathering food

    A bookshop is one of the only pieces of evidence we have that people are still thinking
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  4. 29th November 2013, 06:10 PM #4
    Pepi
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    Hi Bob,
    not sure what you mean...i replaced the fuel filter above the drivers rear wheel.
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  5. 29th November 2013, 06:11 PM #5
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    bob10
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    That's the one I meant, Bob
    I’m pretty sure the dinosaurs died out when they stopped gathering food and started having meetings to discuss gathering food

    A bookshop is one of the only pieces of evidence we have that people are still thinking
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  6. 29th November 2013, 06:20 PM #6
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    djam1
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    Have you freed up the turbo actuator rod? maybe its seized
    To be honest it looks like its under-boosting to me but the sample isn't a particularly good one
    Remove the sensor in the manifold and clean it with contact cleaner
    It may be clogged up with black crap don't clean it with wire or anything that could damage it.
    Over-boosting shouldn't show up until approx 240 or so
    Disconnect your MAF and go for a drive see if its better the readings look a bit odd to me
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  7. 29th November 2013, 06:54 PM #7
    Pepi
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    Hi djam1, thanks for the advice
    i have checked the turbo actuator rod, it moves freely and i added some wd40 for good measure. i have disconnected all the relevant sensors systematically and have seen no change in driving.

    i have a longer data sample from the nanocom ...i'm only new at it sorry
    maybe it will reveal something?
    cheers
    Pete
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  8. 29th November 2013, 07:21 PM #8
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    OffTrack
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    The MAF readings look very low. You'll have to excuse the experiment graphing, but these show how the ECU processes the MAF and MAP/IAT to determine the amount of air filling each cylinder on each cycle. The two traces should be close to each other.

    This is from the Boost1 recording:


    This is what it should look like on a standard setup (no boost boxes, etc):


    I don't see any signs of overboost. The tell-tale indicator is a high manifold pressure reading followed immediately by one of more readings of exactly 100.00 kpa as the ECU limits.

    Have you checked the supply voltage and resistance/continuity in the wiring from ECU to the MAF?

    cheers
    Paul
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  9. 29th November 2013, 07:26 PM #9
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    djam1
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    I am no expert but your MAF readings don't look right to me.
    Can you take the car for a drive and get up to 100 km h and put some load on the engine.
    I understand you should see figures well in excess of 500 when accelerating
    Was it a genuine MAF or a cheapie? if it was a genuine MAF maybe the wiring has rubbed through on the loom in the engine bay
    Last edited by djam1; 29th November 2013 at 07:52 PM. Reason: reread post it does have egr removed
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  10. 29th November 2013, 08:33 PM #10
    stallie
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    Your MAF readings are too low.

    Here's my nanocom output from a while ago.

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