Peugeot 405 mi16 ignition cutting out when I use high beam
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  1. #1
    Join Date
    Oct 2015
    Wellington NZ

    Default Peugeot 405 mi16 ignition cutting out when I use high beam

    Hi All,

    I've got a '90 Mi16x4... a strange fault has appeared. The ignition cuts out for just a short instant every now and then.


    I can make it happen by flicking the headlights from low-beam to high-beam (as though the extra current load is momentarily upsetting ignition circuit somewhere??) but flicking to high-beam doesn't always have the fault appear.... it does happen 9 out of 10 times when the engine is under load (never at idle) pretty much everytime I flick the headlights at 100Km/h or when heading slowly up a steep hill.

    It is so instant that I feel it must be electrical as opposed to fuel filter (but I've ordered another anyway - well over due)

    Ign amplifier?
    Fuel pump relay?
    Ign relay?
    Crank position sensor?

    Any help much appreciated... I have seem a few threads with similar problems but none linked to the headlight / extra electrical load...


  2. #2
    Fellow Frogger! Roland's Avatar
    Join Date
    May 2005


    Have you checked the battery and alternator?

    Also - dirty connections in the ignition circuit could be the fault.

    And believe it or not - the first thing that actually came to mind was spark plugs breaking down under load.
    How new are they and have they got the correct gap?


    Land Rover Discovery 4
    406 Coupe D9 - Manual (2002)
    307 Hdi Estate - Auto - (2007)
    307 Hdi Sedan - Auto - (2007)
    505GR Estate - Personal Import from UK 1971cc Manual (March 1986)
    405 Mi16x4 (all the parts ready to install into the LeMans body)

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