Engine cut out?

[MadMax]

Plug gaps don't change if you have the right plugs in the car - single or double platinums, etc.

[erad]

Plug gaps do change with age. The tips erode. The original NGK plugs I had in my Pajero (1.0 to 1.1 mm gap originally) had opened up to about 1.6 or 1.7 @ 105000 km. OK - it was running on gas, but even with colder plugs, I still found the gaps increased, although not as badly. The centre electrode had worn almost to the insulator. Incidentally, at 105000 km, it was still running fine - no misses etc, but after the new plugs were installed (and the leads disturbed to access the plugs), all hell broke loose after that. Iridiums seem to have fixed the erosion problem , although I didn't have either of our vehicles for the 100000 km to be sure about that.

[jimbo]

What happen, engine cutting out suddenly or a possible shift issue as I described?

Gee, I hope it was just some once off freak event. This car is doing The Great Ocean road trip, including side trips, in a couple of days.

It started out as a stumble at idle when the engine was fulley warmed up, then progressed to the engine misfiring under load. I replaced the leads with second hand ones which solved most of the problem but I think running with bad leads ruined the coil. Replacing the coil solved the problem.

[KWAWD]

It started out as a stumble at idle when the engine was fulley warmed up, then progressed to the engine misfiring under load. I replaced the leads with second hand ones which solved most of the problem but I think running with bad leads ruined the coil. Replacing the coil solved the problem.

Well, the leads are being replaced tomorrow. Will see how it goes after that. Oddly, the hiccup didnt happen this afternoon despite the heat here today

[KWAWD]

Cars been running fine with the new leads. Maybe one of the old leads was damaged.