I’m having several problems occurring together and curious if they may be related.
Two weeks ago, my car started overheating for no apparent reason, and an ignition coil also failed(these events within a few days of each other). In the two weeks since, two more coils have failed and now today I have a misfire on a cylinder(#2) which is running a brand new Hitachi coil.
Overheating continues, happens in hot weather or when going uphill. The radiator is full, no leaking, no consuming coolant, clean inside and out, fans work, cap holds pressure, heater blows hot, radiator hoses hot, hot air coming off radiator, and no signs of headgasket problems. No reason it should be overheating.
The sparkplugs look perfect, show no abnormal deposits or coloration, and are gapped correctly. No apparent cause for three failed coils within a couple of weeks. Now this new misfire, I have no idea whether it is a new coil going bad, or now an injector? I am absolutely certain that none of the previous misfires where caused by injectors because replacing the coils fixed them.
I should probably compression test the engine but can tell from disconnecting coils one by one at idle that each cylinder is pulling it’s weight and engine still runs great despite all this.
It has never had any codes except ignition circuit malfunction and cylinder #X misfire when a coil has failed.
Basically I’m at a total loss as to what could be causing all this and where to go from here. Seems pretty coincidental to all be unrelated, right?