Engine is hunting.
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  1. #1
    Member
    Join Date
    Jun 2012
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    Port Macquarie
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    33

    Default Engine is hunting.

    2005 407 HDi 2.0
    When driving up a slight hill the engine began to hunt and my speed started to taper off and it felt like the engine was about to stall, as I only had 50mt to go I drove home. When I checked the coolant expansion tank it was just over maximum, temperature gauge showed 95 degrees and the radiator fan kept going long after the engine was off. I let the engine cool and drove up some ramps, put a header bottle on expansion tank and bled the system, did not appear to be any air in the system so as per manual started the engine and reved up to just under 2000 rpm, then the engine started to hunt I backed the revs but even at idle the engine is still hunting.
    And the radiator fan did not kick-in at around 90 odd degrees.
    I should also say that the turbo had not been kicking in during that drive. I have removed every vacuum tube/pipe and no leeks to be found, (with a vacuum pump). Could the fact that the turbo is not working have caused the overheating and lose of power or was it due to the fan not working (it does if the A/C is on).

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  2. #2
    Fellow Frogger
    Join Date
    Jan 2004
    Location
    Sydney
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    8,484

    Default

    RHR in the VIN? Read this thread:
    C5 power down
    Check your turbo air piping for splits and the vacuum system for leakage, paying attention to the y-piece down the front. If anything is broken and leaking, the turbo boost will be low. The car may add more fuel to compensate and may run hotter as a result.
    Otherwise, a bad EGR valve can cause hunting. They can drop the valve head or the weld on the control arm can fracture.

  3. #3
    Fellow Frogger! gromzx's Avatar
    Join Date
    May 2011
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    melborne
    Posts
    329

    Default

    Try disconnecting both the vacuum lines from the Y piece and plugging them and see if the hunting stops. This is an indicator that the egr valve has failed.

  4. #4
    Member
    Join Date
    Jun 2012
    Location
    Port Macquarie
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    Default

    I have just replaced the EGR with a new one last week, and my turbo is still not working and I have check all tubes with vacuum pump no leaks I have also check the turbo itself appears to be OK. I'll do some more checks, see what I come up with.
    Thanks for your advice.

  5. #5
    1000+ Posts BIGRR's Avatar
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