Hi there,
Yes i have a couple of things you can ponder!
I think I would service the ignition relay if you haven’t all ready?
It’s located behind the battery on the inner fender.
Going down the highway is a good clue that the ignition turning off.
There are two things you can do to it. One is the connector and the other one is more involved with a thermal issue that might be happening while at those highway speeds.
This electronic relay get a signal from the ICU and is the “middle man” controlling the grounding current of the sparking coil.
I refurbish the paste between components with fresh heat sink paste used on transistors of electronic boards to an aluminum base. This is the same setup!
The paste is white in color and come in tiny tubes to keep the absorptive price down or higher up, depending on how you look at it! Electronic shops are more competitive than the Loctite’s scam packaging in automotive chain store sectors!
The connector has tiny pins inside that may be slightly corroded along with a ground wire, out of the harness around there. It’s fastened under a screw with another ground wire. The screw can get rusted where it engages the steel.
Sometime just pulling the connector off and putting it back on disturbs the green or white gremlin in there!
But if I’m going to the trouble get to that, I go whole hog and pack some anti corrosion salve into it, after inspecting the pins as well as I can.
You don’t want to go blaming any of the computers at this point!
With You, suspecting the system relay it was an excellent thought, I shall add!
The soldering on the circuit traces are subject to cracking inside of those. A reheat of the solder can fix them for spares!
I recommend doing this, so called “power amplifier,” about every ten years or longer, depending on the car working environments. It should be considered a routine maintenance to stop the possibility of like issues that you are experiencing.
Between the coil wire, itself or the rotor button, in the distributor, they can be other causes but it’s usually a hard starting issue with those.
Hope this spreading of the boards suggestions helps!
Phil
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