406 hdi hunting surging when first stating
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  1. #1
    Fellow Frogger! Balki's Avatar
    Join Date
    Nov 2010

    Default 406 hdi hunting surging when first stating

    i have owned 2 406 hdis and both hunt when cold, i never worried about it but a freind has one and wants it fixed, anyone have any ideas as to what causes hdi to do this


  2. #2
    Fellow Frogger! gromzx's Avatar
    Join Date
    May 2011


    Do they both have high K's?
    My 306 HDi (same engine without intercooler) had this exact problem and got worse with cold weather to. Was around the 250000k mark back then.
    For me the prob was the fuel pressure reg in the back of the H/P pump. going on 350000k now with no problems.
    You can get them for about $400 if you can find a suppler that can source direct from Bosch.

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