engine run on..... - Reply to Topic
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Topic Review (Newest First)

  • 18-07-2011, 16:15
    Col
    Quote Originally Posted by digger View Post
    HEI ignition, 8mm leads, accel plugs, one wire gm.

    How do you test the hei ?

    cheers
    The plug that goes to the cap. 1 wire should be your 12V +. Make sure it goes dead when engine turned off. You may have to extend wires from plug to cap using a couple of wires with crimp connectors so you can connect a meter.
  • 18-07-2011, 16:07
    Plumpcars
    I would still suspect a back feed rather than the HEI. Is the one wire alternator connected directly to the battery or to an ignition switch fed source?
    What happens if you disconnect the v belt and the alternator wire?
    I know the three wire alternators have a back feed issue but have not experienced it with a one wire.
  • 18-07-2011, 15:47
    digger
    HEI ignition, 8mm leads, accel plugs, one wire gm.

    How do you test the hei ?

    cheers
  • 18-07-2011, 13:20
    Plumpcars
    Quote Originally Posted by Plumpcars View Post
    Also what car/ignition/wiring/alternator is he using?
    It would help to know this ? On a Chevy it's possible to get a backfeed from the alternator which can cuse certain ignitions to still run. As satan asked it happens with MSD units. If the alternator wiring is non standard it can cause it as a resistance wire can be missing.
  • 18-07-2011, 13:05
    Col
    In that case sounds like you have a "back feed" to the ign coil poss from alternator or maybe key switch itself. I have seen this when a ballast resistor was somehow wired through the acc position on keyswitch instead of the ign position although I forget the exact details, but coil was being back fed from the radio I think.
    Re check the wiring to the keyswitch, the switch itself and the alternator warning light and make sure the feed to the coil goes dead as soon as engine is turned off (meter across from + of coil to earth assuming neg earth and std type coil ignition. Should go to zero when key turned off)
  • 18-07-2011, 12:01
    digger
    Quote Originally Posted by Col View Post
    Are you saying turning the key doesn't cut the spark straight away, or that it is true running on, ie "dieseling" because they are caused by 2 different things?
    yep this is the case....turn key off dosnt stop engine.

    cheers for the responses
  • 16-07-2011, 11:18
    Col
    Are you saying turning the key doesn't cut the spark straight away, or that it is true running on, ie "dieseling" because they are caused by 2 different things?
  • 16-07-2011, 10:27
    satan
    is it fitted with msd ignition?
  • 16-07-2011, 10:25
    Roscobbc
    An overly rich idle mixture can cause this, especially if a 'hot' cam has dictated the need for a richer idle mixture to enable the engine to 'tick-over'. The carbon deposits left by the rich mixture can create hot spots either in the combustion chamber or on the spark plugs, possibly change the ignition curve to get more advance at idle (retarded ignition creates heat within the combustion chamber) - perhaps a carb 'work-out' on idle jets & idle bleed jets (if a high spec carb)
  • 16-07-2011, 09:11
    Plumpcars
    Also what car/ignition/wiring/alternator is he using?
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