2008 407 2L Hdi Auto Engine Surging at low speed
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  1. #1
    Fellow Frogger!
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    Default 2008 407 2L Hdi Auto Engine Surging at low speed

    We are getting engine surging at low speed and low rpm in our 2008 407 2L Hdi 6 speed Auto. What causes this? It is not something I experienced in our 2007 Citroen C5 with the same engine and gearbox.

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  2. #2
    Fellow Frogger!
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    Anyone?

  3. #3
    Fellow Frogger! gromzx's Avatar
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    Have you had a look at this thread yet:
    407 Surging Problem

    Does it idle fine?

  4. #4
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    See above. I think your first task is to take the car on a low-traffic motorway, for a long steady fast run, to give the FAP system a chance to regenerate by itself. Only then start looking for faults.

    I hope the right low ash oil is in it.

  5. #5
    Fellow Frogger!
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    I have had the car about 4 weeks after having a Citroen C5 with same engine & transmission written off.
    I am using Penrite DL/1, recommended oil for the 2L Hdi engine.
    I have no idea what was used previously.
    OK, Idle is perfect. I have not done a highway run since owning it.
    Thanks guys...

  6. #6
    Fellow Frogger!
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    Thanks guys - you have solved a 406HDi problem for me. The car has been surging on and off at low speeds and the turbo has seemed like it was not kicking in until over 3000rpm. I read the question above and followed the links and found the matching problems as mine. The suggestion seemed to be the Mass Airflow Meter just behind the air intake box. One writer had success at cleaning his, another found it made no difference but swapping the unit achieved success. I pulled mine out and liberally applied electrical contact cleaner, wiped the small metal plate with kitchen paper and a tooth brush. Car runs really well again! The successful writer talked about the metal plate having oxidation on it - it certainly seemed like something was on the plate. Peugeot have two new units available but the cost is about $270 +gst, I hope my solution lasts!

    Glenn

  7. #7
    Fellow Frogger! andrepug's Avatar
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    Glenn, this supports your efforts;
    https://www.youtube.com/watch?v=tT8yHXJCjJI

  8. #8
    Fellow Frogger!
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    Yes, this is one of the things I found when I was following the leads. Thanks. Glenn

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