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Thread: V8 misfire i think

  1. 6th November 2009, 12:46 PM #1
    NickSuzy Guest

    V8 misfire i think

    Hi there

    I have had a 92 discover v8 for over a year now and it has been great apart from me doing the clutch obviously.

    But now the car has some strange goings on.

    It seems to have some sort of misfire i think. You can drive it all week and it wont be a problem but then you can just be pottering down the street and it seems to miss and sometimes it will die and come to a halt while other times it will recover and carry on.

    When it does dies sometime it will start straight away while other times you need to leave it a few minutes and then try and it will start fine again.

    It has had a service including fuel filter and it is still the same. Apart from this it is going great.

    Any help on this matter will be greatly appreciated as i am getting ear ache from home as it is her daily drive.

    Thank you Nick
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  2. 6th November 2009, 01:29 PM #2
    PhilipA
    PhilipA is offline Swaggie Subscriber
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    It has never happened to me, but sounds like the ignition amplifier is dying.

    They are affected by heat, so next time pour some cold water on it . It is on the side of the distributor.

    Regards Philip A
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  3. 6th November 2009, 03:35 PM #3
    ohleaky1 Guest
    plugs and leads in good condition?
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  4. 6th November 2009, 08:26 PM #4
    discomuzz's Avatar
    discomuzz
    discomuzz is offline Master
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    Earth straps!

    Pull 'em all off, clean and replace.

    Possibly!
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  5. 7th November 2009, 09:54 AM #5
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    V8Landy
    V8Landy is offline Wizard
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    Give it new plugs leads rotor button and dissy cap(genuine ones of course).
    is it on gas and have you done any mods to it recently??
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  6. 7th November 2009, 10:35 AM #6
    discoveryseries1
    discoveryseries1 is offline Master
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    i replaced my disy with a scorcher from preformance ignition in melbourne they are machined in australia from billet and have australian bosch parts. the modulator is internal as aposted to a remote modulator found in the stock d1 behind the headlight. if you can recreate the problem use a timing light on each wire to check for active spark, eg the timing light will strobe on what ever lead has a spark. if you have no signal or no signal on one or more cylinder you have your answer.

    good luck , let us know how you go.

    ps if we wanted to save fuel we wouldent drive a disco
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  7. 7th November 2009, 07:16 PM #7
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    Disco95
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    It hasn't happened to me either, but I'd have to go with Philip A on this one.
    Surely they can't be too expensive to replace a a first port of call.
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  8. 10th November 2009, 01:45 AM #8
    streaky Guest
    I agree...I've had this happen to me recently.
    The amplifier is located in one of two places depending on your model.
    It's either on the side of the dizzy or underneath a mounting plate secured to the coil.
    Be sure to apply heat sink compound to the under side of the amp when you refit it or it won't disipate heat build up.

    Regards.

    S.
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  9. 11th November 2009, 08:18 AM #9
    NickSuzy Guest
    Ignition Module Lucas Distributors 3 PIN STC1184 NEW on eBay (end time 03-Dec-09 15:49:30 GMT)

    is this the item that i will need as i need to purchase it today.

    Thank you for all you comments it is very much appreciated.

    Cheers Nick
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  10. 15th November 2009, 11:25 PM #10
    streaky Guest
    Thats the one!

    I've had a recent problem with intermitant mis-firing. It turned out to be the plug that pushes onto the top of one of the injectors was faulty...very easy fix.
    Check ALL connections before buying any new parts!
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