4

What you found is not necessarily a weak spark. The test you described with pulling off the spark plug wires off one at a time to see how the engine behaves is a general misfire test. All you can really conclude is that the cylinder that makes very little change is misfiring. When dealing with ignition components, they are generally replaced as a set. You ...


3

No, you shouldn't rebuild the engine unless you have a specific reason. 120k miles isn't that much for a modern engine, so there's no reason to spend the effort, time and money to strip it down. Clean the engine so you find and fix any leaks, do a compression check and do any service items that are due or will become due on the trip like timing chains, ...


2

It seems you have found the bad cyilinder already. Try swapping its spark plug with one from another cylinder to see if the problem is now caused by that cylinder. You then know for sure if the spark plug is the troublemaker, or if it's somewhere in the path to it. The former option is the most likely. If it's indeed the spark plug, and if they have a decent ...


1

It sounds to me like you have condensation forming in the exhaust system. When you start up the hot exhaust gases boil it off and you get a puff of steam. you don't say exactly where you live, but does the smoke come and go with humidity or dewpoint?


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