Cylinder misfires

Good morning all
The jimny started acting up yesterday , it was feeling really rough with the revs all over the place .
the engine light briefly flashed on then off again , when i put it on the diagnostic machine , these codes came up .
I had jet washed it the day before and i was very low on fuel , could either of these cause problems or just coincidence?
any help would be terrific 
Cheers 

Year and model?

If you jet-washed under the bonnet, then yes, that could be a factor. More details about the Jimny would help the experts advise you tho.

Ahh sorry ,im new to this Its a 2011 sz4 , if that makes sense
and no didnt jet wash under bonnet
Cheers

As you are getting a misfire across all cylinders it most likely isn’t a coil or spark plug, it has to be something common.

It could be the crank/cam position sensor, but if you didn’t go near the engine with the jet wash, the crank sensor is probably ok as well.

Depending on how low you were/are on fuel you might have been sucking air in to the pump and this could certainly cause a misfire. The other problem with low fuel is condensation in the tank causes water in the fuel which settles to the bottom of the tank and you might have a bit of water in your fuel.

If you fill up does it stop misfiring? If it does, you might want to get a petrol treatment/additive, E.g. Redex to clean the fuel system.

The other cause of strange misfires is a weak battery, is it well charged?

Robin

Thanks Robin
It was fine until i got low on fuel , filled it up and thats when i noticed the misfiring , if it is condensation in the tank will the redex sort this out or is there a fuel treatment that gets rid of the water .
Battery is 12.57 v
I might change the sensor anyway just to rule it out
Cheers
Sean

It's possible that the petrol you filled up with had water in it or it's possible that with such a low level in your tank, filling it up dislodged any sludge at the bottom of the tank.

I don't know how likely that jet washing the car let water in to the fuel system, I think it is unlikely to enter the tank, although it may have entered via the air intake, then it's not in the fuel. You might want to check the air filter and air intake for any signs of water, especially if you have a snorkel fitted.

Water or other particles could enter the fuel pump and injectors where water can become stuck and block fuel flow.

Before trying to get rid of water in your tank, you need to know if the tank actually has any water in it. There are some test kits and paste on the market, but I don't know how easy it is to do and you might need a garage to tell you for sure.

As for getting rid of the water, it depends where it is, if it is in the tank then there are additives which claim to remove the water (I don't know how effective they are), but I suspect a garage would just drain the tank.

If water is stuck in an injector there are some additives which claim to deal with this, but again a garage will probably remove the injectors and clean them manually.

Basically if you suspect that water is in the fuel system get it tested first otherwise it could get expensive and still not fix the problem.

Your battery sounds OK. The reason I ask is that a couple of years ago my other (non-Jimny) car had something similar and this was after it had been unused in a garage for a couple of days. On picking it up, it was very low on fuel so I stopped at a garage I don't normally use and a misfire resulted.

I tried everything, changing sensors, coils, plugs, leads over a few months, everything made an improvement but the misfire kept coming back. It turned out they had left the keys in the car whilst in the garage and this had drained the battery to about 8V. Every time the battery got down a bit even though the car would still start, the misfire would occur.

Since then I have just made sure the battery is well charged and of course I have new plugs, leads, coils, MAF sensor and several bottle of Redex through the engine, all of which clearly made a difference, but wasn't required to fix the misfire.

Robin