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[Raeturbo]

STRIKE IT DOWN I TELL YOU!!⚡️⚡️⚡️⚡️

[Marks DTM Calib]

I knew this would be back 

There are a few clues, clearly disturbing things is impacting operation, be it a wiring harness or crud in the system.

It has to be a single item related to a system around a single pot, as otherwise it would randomly be across all pots (so you can rule out pump and the like)

Cat efficiency might be a clue, if an injector was failing you would expect ether loads of fuel, a poor spray pattern (its not direct injection so not going to make a major impact here, it will still evaporate off the back of the inlet valve), or no fuel (which the Cat would not care about), might be worth checking the sparks again

[Kevin Wood]

Yep 
Only difference this time is that I stopped at a petrol station after 5 minutes (after which it ran fine) rather than carry on driving for miles.

Bear in mind that, if it detects a misfire, it'll probably shut down the affected cylinder until the next restart.

Is it still cylinder 3 that's misfiring?

I will reiterate that I recently did a lunch hour job replacing 2 out of 3 of the coil packs in a mate's one because they were intermittently tripping a misfire code (and you really notice when you're down a pot on these)! 

You swapped the injector before, IIRC? so if it hasn't moved it's probably the plug / coil pack or outside chance some dodgy wiring (it's French, after all), and if it has it's the injector.

[Rangie]

Just went out swapped no1 and no3 injectors to see if the code followed the injector.
Started it up and it runs perfectly. Drove it for a couple of miles and its running just as it should.
No EML and no codes.
Can only assume the manky petrol has worked its way through, or now been well enough mixed with the fresh stuff. 

.

Great result 👍

[Migv6 le Frog Fan]

Have swapped plug, stick coil and injector between 1 and 3,  but code stayed at pot 3. The most recent incident though only threw up cat efficiency code .
Maybe because I stopped and put petrol in to bring the fuel level back up, rather than keep driving until I got home.
A mechanic on another forum claims that cylinder specific codes on these arent always accurate and can be taken with a pinch of salt ?
Will have a check of injector wiring, but if that doesnt provide any answers Im going to run the fuel level low again, and then see if I can make some progress with it.
Maybe completely empty and clean out the tank and then start fresh from there.
It isnt a huge problem so far, but pretty irritating, and may get worse until I diagnose it properly.

[Kevin Wood]

Have swapped plug, stick coil and injector between 1 and 3,  but code stayed at pot 3. The most recent incident though only threw up cat efficiency code .
Maybe because I stopped and put petrol in to bring the fuel level back up, rather than keep driving until I got home.
A mechanic on another forum claims that cylinder specific codes on these arent always accurate and can be taken with a pinch of salt ?
Will have a check of injector wiring, but if that doesnt provide any answers Im going to run the fuel level low again, and then see if I can make some progress with it.
Maybe completely empty and clean out the tank and then start fresh from there.
It isnt a huge problem so far, but pretty irritating, and may get worse until I diagnose it properly.

Which might be why we ended up replacing 2 of them on my colleague's car. And I think he'd already had the third replaced by an AA man...

[cam.in.head]

not sure on that model if it uses a supply line to the injectors and then the regulator (if there) sends excess back on a return line or wether its regulated at source and then only has one supply line to the front  ? either way a pressure test is a good idea eventually

[Migv6 le Frog Fan]

Just supply to the rail. No return.

[Nick W]

Just supply to the rail. No return.

That's where you test the pressure.


There are too many potential causes to fire the parts cannon in the hope you'll hit the target

[Migv6 le Frog Fan]

But how to test it ? 

[cam.in.head]

if there is no valve to test the pressure from them you will need to 't' into the connector .most pressure guages come with a selection of adapters.

[Migv6 le Frog Fan]

Cheers. Might have to look into doing that. 

[Migv6 le Frog Fan]

Just to (hopefully) finish up this one.
I have deliberately run the fuel level down to very low and left it parked up overnight for two nights.
This was expected to make it play silly buggers again, and I would then drain the tank, but it has run perfectly, so have now brimmed the tank.
I can only assume the can of petrol I tipped in the tank just before the problems started, was contaminated in some way and has now been completely used up.

[Raeturbo]

Ahh happy ending for a change 👍

[cam.in.head]

it all sounds very likely especially if the car had never experienced any issues at all untill you put the can of fuel in it.  modern fuel doesnt keep very well compared to what it used to .
i remember draining the tankof a car  that i hadnt used for a few years and tried to use the fuel up by putting just one can in a car with half a tank of current fuel in it. it was definately a bit jerky afterwards for a while ?   
time will tell !