For the HEI mod - one thing that was left unmentioned was that you have to disable the stock ignition module. If your stock module is bad and is shorting the trigger signal - the external HEI module will not work no matter how better/powerful it is.
You can disable the stock module in two ways -
-Remove the module from inside the disty
-Cut the connections that go to the module (I cut the orange wire and the adjacent wire - it is important to cut both because the other wire is the stock module ground - if you left it uncut the stock module can still short out the internal coil)
Dies out constantly..
94 Mx-3 Precidia
1.8L 4Cyl DOHC newGen BP (used to be B6DE) ATX
http://www.mx-3.com/phpbb2/viewtopic.php?t=54032
http://www.cardomain.com/id/ariesdude
1.8L 4Cyl DOHC newGen BP (used to be B6DE) ATX
http://www.mx-3.com/phpbb2/viewtopic.php?t=54032
http://www.cardomain.com/id/ariesdude
Can you post pics of the gutted disty and the hei wiring just so people can spot anything obvious that was overlooked before. There might be a metal spot that has very little silicone cover and its arcing when warm - maybe?
Have you replaced the coolant thermo sensor?
Also try running the motor with the o2 sensors unplugged - it might throw a code and put the ecu in limp mode (which can be fixed by a reset)- but atleast you can take off o2 sensor from the list.
Another thing that affects the engine when warm is the EGR system - Have you blocked the vaccum hose to EGR by mistake?
Have you tried pulling codes?
Those are the things i could think of right now - Since you mentioned the tach going to zero suddenly - IMHO it's most likely a disty/coil problem - I would probably get a junkyard disty just to eliminate any doubts about the disty setup.
Have you replaced the coolant thermo sensor?
Also try running the motor with the o2 sensors unplugged - it might throw a code and put the ecu in limp mode (which can be fixed by a reset)- but atleast you can take off o2 sensor from the list.
Another thing that affects the engine when warm is the EGR system - Have you blocked the vaccum hose to EGR by mistake?
Have you tried pulling codes?
Those are the things i could think of right now - Since you mentioned the tach going to zero suddenly - IMHO it's most likely a disty/coil problem - I would probably get a junkyard disty just to eliminate any doubts about the disty setup.
94 Mx-3 Precidia
1.8L 4Cyl DOHC newGen BP (used to be B6DE) ATX
http://www.mx-3.com/phpbb2/viewtopic.php?t=54032
http://www.cardomain.com/id/ariesdude
1.8L 4Cyl DOHC newGen BP (used to be B6DE) ATX
http://www.mx-3.com/phpbb2/viewtopic.php?t=54032
http://www.cardomain.com/id/ariesdude