Misfire lumpy idle

[Sj1782]

Had to be recovered yesterday due to eml and misfire, obd codes were p0300 and p0330 random misfire and knock sensor?
Just ordered a new coil pack with new ht leads and also ngk platinum spark plugs. Hope this solves the issues but also read could be injectors? How do you check for a faulty injector

 

[RS Charlie]

It's a tricky one. CLIP may help but it's hard to say.

 

[Sj1782]

I can get hold of a set of injectors low mileage ones for £40 I may look at replacing the injectors while I already have the manifold off. don't have much time as Its used daily for work!

 

[RS Charlie]

From what I've been told the injectors are a pain to replace. As in putting the injectors back onto the rail and then into the car!

 

[Alastair.]

Injectors are common and very easy to replace, all you need to to is remove the fuel rail to get to them.

 

[LeeRS]

I would put new ones in to be honest if it does come down to that being the issue.
At least you 100% know your not putting a knackered one back in.
You can test them of course but easier replacing with new.

 

[Ander3670]

very easy to do to test (without special tools) take a screwdriver and place it against it metal to meatl and then your ear on the tip of the handle you should hear a tapping noise.....if all is good there take the injectors all out still on the fuel rail and place a bit of card board infront now turn the igniton on and off then check the spray pattern for any thing irregular

 

[Sj1782]

Cheers guys will try this at the weekend

 

[N4TH4N]

I managed to replace all 4 of mine in half hour without removing the fuel line so it didn't break the o ring. Dead easy. Use some grease on the injector o rings. They push in easier that way

 

[bloke]

very easy to do to test (without special tools) take a screwdriver and place it against it metal to meatl and then your ear on the tip of the handle you should hear a tapping noise.....if all is good there take the injectors all out still on the fuel rail and place a bit of card board infront now turn the igniton on and off then check the spray pattern for any thing irregular

can your ear tell you if it's pulsing for a few milliseconds longer than it should be?

 

[JB21]

I've recently had injector issues, changed everything as OP suggests in first post to no avail but had no EML light but could tell the car was running on 3, Renault 'specialist' couldn't get into the fuel rail tables using CLIP so just pulled the rail guard of and pulled each injector individually to see any change, low and behold no difference when I pulled No 2, so changed it and car is running sweet again. Dead easy to as well.

 

[dann2707]

very easy to do to test (without special tools) take a screwdriver and place it against it metal to meatl and then your ear on the tip of the handle you should hear a tapping noise.....if all is good there take the injectors all out still on the fuel rail and place a bit of card board infront now turn the igniton on and off then check the spray pattern for any thing irregular

Although this is good advice if it's dead completely, it doesn't work if the injector is intermittently failing sadly.

 

[Ander3670]

Yeah dan shuda said that and bloke hes looking for ways to narrow down his fault....apologies i guess my answer shudve been take it to a recognised renault specialist so they can find it for you and charge you accordingly

 

[KitsonRis]

When it is missing and running on 3 cylinders unplug each injector one at a time. If it goes to 2 cylinders then that injector isn't faulty. If there is no difference then that is the faulty one. But this will only work if it isn't intermittent. This is how I diagnosed mine, along with a OBD code reader
Euro Car Parts do injectors for £40 each, they are reduced online so if you go into the shop ask for the online price!
I replaced one the other week, all I needed was a 10mm socket. It is a simple job, but don't do it in the cold like I did as the o-rings are very stiff and it took a good bit of wiggling and patience to remove. There is a good guide on here somewhere explaing how to remove it all.

Start with the coil pack and leads as they are easier to swap IMO as they are nuts and bolts and not a push fit. Take it from there. I am having another similar issue but different symptoms and I am going to swap coil pack and leads.

 

[bloke]

if you've not got diagnostic or it won't i'd what injector is faulty best way to check it measure resistance on them.