Misfire - failed code reader says....

[richard300]

Went to give the car a bit of a run today as its been standing around in all this wet weather for 2 weeks and is due an MOT tomorrow.... It started fine, then about 5ins into the drive it developed a big misfire...
My basic fault code reader says:

P0203 injector circuit open cylinder 3
P0443 evap emission control purge valve C fault
P0314 misfire detected cylinder not specified...

I guess it's the P0203 one I need to investigate as the 3rd code is a result of that? And I was already of the second code
(carbon canister removed)

car is 52 reg 172 cup
Anyone have any advice?

 

[hipwell]

Pull a lead of each plug 1 at a time. When you remove one and thremovedremoved the same then you know that's the one to investigate.

The other 3 that are working will cause the engine to run even worse when removedremoved

 

[Beasley Clio182]

Think you've pretty much nailed it , sounds like injector 3 has gone down, open circuit means a break, they are quiet common , just remember Renault injectors are backwards , so injector 3 is actually the 2nd one from the left !

 

[hipwell]

I meant injectors, not plugs lol.

 

[SparkPlug]

It will be a failing injector on cylinder 3, I had the same code on mine 2 months ago, I ended up changing all of them in the end,

 

[richard300]

Thanks chaps - Purchased a new fuel rail and injectors from RenParts and it sorted it out (it was the fuel injector itself on Cylinder 3)

 

[Edges]

As for the purge valve, have you tried connecting the two wires for the carbon canister? Worked on one I did recently

 

[richard300]

Gggrrrrhhhhh...... This car is testing my patients!
After fitting the new injector parts i drove the car on Saturday and it was great, very responsive, loads of power - a really, really nice drive.
My brother took it to his work yesterday and it drove fine.

Went to take it for it's MOT today and within 5mins it was misfiring again - The only problem is, that its not showing a check engine light or showing any fault codes - so i was unable to diagnose the problem!!

 

[Liamlouis]

Sorry to revive such an old thread but I’m having the same problem on a 53 172. Replaced No.3 injector and despite it not running as boggy it’s still mis-firing. Sorry for sounding like a tw@t but the injector I replaced doesn’t look like it’s seated properly could this be causing the mis-fire still?

 

[Liamlouis]

 

[MonkeyKnifeFight]

looks in enough to me they can be a pain to seat properly. I certainly wouldnt say thats the reason for a miss fire as both my middle injectors look like that and my car runs fine.