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Thread: Y30DT Looses boost, clear fault code and back to normal!

  1. #1
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    Angry Y30DT Looses boost, clear fault code and back to normal!

    Right had my 3L V6 sri remapped by MPG, did a cracking job, boost is strong 99% of the the time and the car pulls like a train. Only problem and its happened twice since it was mapped is the boost pressure sensor fault code comes up. P0235 iirc, so with my cheapy Sealey code reader, I can clear the fault, spanner light goes out and I can carry on my way.

    Im thinking because the boost pressure has been raised could the actuator be sticking? Im not sure of the turbo set up on this engine. Is it possible for the waste gate to jam open by-passing the turbine. Reason I ask is the exhaust goes really loud, which I'm thinking is being caused because there is no silencing effect caused by turning the turbine blades. Reasonable theory?

    It's an annoying niggle thats spoiling an otherwise perfect car. Help me!!

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    Anyone help me with this please??

  3. #3
    Full Member Big Sig's Avatar
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    Whip the boost sensor out and give it an inspection. It might just need cleaning.
    Now I need a turbo to keep up!

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    From TIS2000:




    With trouble code P1635 not recognised:
    • The boost pressure is too low
    Effect:
    • Exhaust gas recirculation valve is switched off
    • Boost pressure control is not longer possible.
    conversely:




    With trouble code P1635 not recognised:
    • The boost pressure is too high
    Effect:
    • Exhaust gas recirculation valve is switched off
    • Boost pressure control is not longer possible.
    Remedy is listed as checking high pressure (air) components for leakage - not much other useful information. However, since the EGR is also mentioned, it might be worth obtaining some live data readings whilst the car is being driven - especially if the fault is readily repeatable.

    EDIT: did they map out the EGR as well?

    If so, you might need to take the car back for a little 'tweaking' of the map to keep things 'within parameters'

  5. #5
    Regular Member lee gsi's Avatar
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    Vehicle : Signum

    Trim : Design

    Engine : 1.9 CDTi

    Year : 2005

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    Have you checked for boost leaks?

    Make sure the boost hoses are clamped nice and tight as they maybe leaking under full boost.

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    I did ask if he could map out the EGR, however he said it wasn't possible to do, so would this still cause an issue, I will check out the boost pressure sensor to see if it's diffy.

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    Quote Originally Posted by lee gsi View Post
    Have you checked for boost leaks?

    Make sure the boost hoses are clamped nice and tight as they maybe leaking under full boost.
    Yes m8, good suggestion - I have had issues with the union between the throttle body and the rigid pipe (top of engine) and with the pipe splitting as well (part on order right now!). Also the flexi pipe to which the rigid one connects to has been known to split.

    At 1500rpm, the engine makes appreciable boost, so if you can get someone to hold the revs here, you can look under the bonnet (engine cover removed) and look / listen / feel for leaks.

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