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  1. Thanks to both of you for data,

    [QUOTE=Blue;453925]Cracks usually occur in 3&4 (exhaust ports are side by side) and in 6 (hottest due to distance from rad and cool water flow).

    Heads with liners seem more prone to cracking.
    ...
  2. Head, not sure if head gasket or head cracked at this stage.

    Have water in oil, cyls 2-6 fine, nr 1 plug wet, water in oil. Suspect it is head gasket but not sure.
    Do not have place to do head gasket nor tools, etc, so will have to pay to have done by local...
  3. Ign relay not the issue

    For now have the thing fixed. I simply started at the point where power goes on to systems, there are TWO wires that go to the inline fuseable links. They seem to have ONE common hook up at...
  4. NOW it is messy

    Just on outside chance, tried hooking batter back up. Guess what, same error went on WITHOUT relay OR ign switch hooked up. So went back to wiring diagram as for now appears that Ign Relay is NOT...
  5. Not ign key switch

    As I mentioned, the same thing happens when the key switch Harness is disconnected, early on in the failures when they were random, turn key off/on and it went away. Unplugged key switch from harness...
  6. Ign Part

    THANKS MUCH, somehow missed them, nice site as wife has 93 240SX convert that will be back on road as soon as auto trans either repaired or replaced, her "Baby" as she loves it, gets great MPG and...
  7. Ign relay

    When I hook up battery, KEY OFF, also with Key harness unplugged at key, following things happen, EFI relays under hood active, fuel pump starts, no charge lite on and volts show 4-6 with engine off,...
  8. My dreawing from FMS for 1978 280Z shows 6 wires...

    My dreawing from FMS for 1978 280Z shows 6 wires from IGN RELAY, you may have different year or are looking at the Tranistor IGN UNIT, a easy error to make. NIssan parts guy did same on first pass,...
  9. checking relay

    Cannot find a check method in my FMS, maybe missed it. Issue is how to check as suspect something is open, but not sure which opens and closes points. Would like to use or replace guts but not sure...
  10. 280Z NEED "ignition relay", cannot find any

    1978 280Z manual, 2 seat. I have had a continued problem with "systems on" AKA fuel pump runs, volt charge lite on, EFI relay goes on, when Key off. I first tested all EFI (under hood right side box)...
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