Peugeot 405 mi16 ignition cutting out when I use high beam
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  1. #1
    Tadpole
    Join Date
    Oct 2015
    Location
    Wellington NZ
    Posts
    3

    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.

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    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?
    AFM?
    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...

    Cheers

  2. #2
    Fellow Frogger! Roland's Avatar
    Join Date
    May 2005
    Location
    Perth
    Posts
    726

    Default

    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?

    cheers
    Roland

    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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