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[Viral_Jim]

Either that or a loose connection to an injector that you unintentionally fixed when you swapped them over.

Either way I hope it stays working for you! 

[cam.in.head]

i hate weird issues like this but hopefully it might be solved and if it does reoccur you will see what cylinder it throws up . quite fun little cars when they are working right !

[Migv6 le Frog Fan]

It is indeed fun, in a slow motion kind of way. Get up to speed and dont slow down for anything is the way to drive it. 

[STEMO]

It is indeed fun, in a slow motion kind of way. Get up to speed and dont slow down for anything is the way to drive it. 

Ahhh.....straight from the YZ250 school of driving 

[YZ250]

It is indeed fun, in a slow motion kind of way. Get up to speed and dont slow down for anything is the way to drive it. 

Ahhh.....straight from the YZ250 school of driving 

 

[Andy B]

It is indeed fun, in a slow motion kind of way. Get up to speed and dont slow down for anything is the way to drive it. 

That's how I drive my Fortwo Smart 

[Migv6 le Frog Fan]

As James Hunt once said " Its more fun to go around a 50mph bend at 60mph, than to go around a 160mph bend at 150mph. 

[Marks DTM Calib]

It is indeed fun, in a slow motion kind of way. Get up to speed and dont slow down for anything is the way to drive it. 

That's how I drive my Fortwo Smart 

That's how I drive everything 

[Migv6 le Frog Fan]

Curiously, this problem reappeared this morning.
Similar conditions to last time. Around a quarter of a tank of petrol, and had been stood overnight.
Within half a mile of leaving work it started misbehaving again.
I pulled into a petrol station and put £25 in and it ran perfectly after that.
I may run it down to quarter of a tank again and then drain whats left in the tank to see if that helps.
Dont know exactly what the pump setup is, but may be sucking up water or some other crap when the fuel level gets low ?

[ronnyd]

Had a Mazda 626 years ago. The petrol filler tube that went down through the rear wheel arch rusted through. The tank was slowly letting in water, so misfiring was happening more and more as the water level in the tank rose. Just a thought for your problem.

[Doctor Gollum]

Fuel would sit on top of any water and the pump should pick up from the bottom of the tank. Is the tank pressurised (positively or negatively) to the extent that there's an audible noise when you undo the cap?

[Migv6 le Frog Fan]

Not that Ive noticed.
Maybe the fresh fuel being pumped in could disperse water, which then settles at the bottom again as fuel level goes down ? 

[Doctor Gollum]

Run the tank dry/drain and refill with Vpower. And replace the injectors...

Is the latest code still for cylinder 3 and is that by chance the first cylinder on the fuel rail

[Migv6 le Frog Fan]

Havent checked code yet, but I expect cylinder 3 misfire, because it always is. Even when I swapped spark plug, injector and stick coil  from 1 to 3.
A mechanic on another forum said that he has found that cylinder related codes on these should be taken with a pinch of salt, and can be a red herring.
Think its the last one on the rail but will need to check.
Im now also wondering if it could be a sign of fuel pump starting to fail. Not sure how to diagnose for sure though.

[Viral_Jim]

Ok, fwiw I think you should look at the lift pump.

I'll bet cylinder 3 is the last on the rail, so any fuel supply deficiency will manifest there as cylinders 1 and 2 take the available fuel first.

As the fuel level drops, the lift pump has to work harder to suck the fuel out so that's when any weaknesses will show. Tbh I think the old fuel is a red herring, it would have mixed when you fill the tank and by driving around so I don't see why it would wait until there's only a 1/4 tank left before it shows an issue.