Dreaded Missfire

[powey]

Driving the other day and car started to missfire (1/2 tank of petrol).

Went out to try it the day after and it drove fine for about 50m.
Ordered Leads from PerformanceLeads and NGK PFR6E-10 plugs, fitted these just now and still no cure.
The engine management light is flashing but is always on due to a decat.

Ive seen people post about Coilpacks, Injectors and 02 sensor so any ideas what I should try next?

 

[TheEvilGiraffe]

Take each plug out and see what's occurring.... Be careful with cyl3 (no.4 is the gearbox end, as it's French) as that's notorious. I think they made it out of cheese. Had to heli-coil mine. (Stressful much ?! :dead

 

[powey]

All 4 plugs that were removed was a nice golden brown and not wet

 

[Nayparkin]

Coil pack helped the miss on idle but not under load, turned out to be the leads but i read a lot about the map and lambda sensors too

 

[powey]

You can hear its lumpy on idle and also whilst driving

 

[Cooksport]

powey I remember seeing u at combe, how local are you?

If you get stuck, i can look over it for u.

 

[powey]

Quite a treck from combe , about 70 mile away into south wales.

Thanks for the offer though

 

[Guppy]

You can try my old plugs/leads if you fancy mate?

 

[powey]

cheers Gupspeed I got a coilpack on order so il see how that turns out and let you know

 

[powey]

fitted the coilpack and no difference, going to try and book in to get the EM read.

 

[gogsie]

I had the same missfire as you and have just found out it was a faulty injector so have ordered up a new one.

I just whipped off the injector connectors as it was running to see which one made no difference to the running of the car, I then swapped the faulty one over with a good one to check the wiring and to confirm the dead injector.

£59+vat each from renault though!!

 

[powey]

Gogsie you sir are correct! Had it plugged in and came back with a fault for number 2 injector

 

[gogsie]

Cool, glad i could help!

Should get my new injector tomorrow 4 day wait from Renault