We had a 2002 Clio with the 1.2 16 valve (D4F,chassis code BO5) engine in it at work this week which had the engine management light on and the car was intermittantly misfiring.The codes stored in the ECU
were refering to a misfire on cylinders 2 and 3.
We traced the fault to the coil
pack(surprise,surprise!).The D4F engine is a bit of an odd ball engine as rather than using individual pencil coils
it uses one coil
to run all the cylinders.
The unit is held on with 3 T30 torx headed bolts (holes marked in picture below
)and is very easy to replace.You just pull the leads off of the plugs,remove the multiplug from the coil
and undo the three bolts.
A couple of things to bear in mind are the fact that the ends that go on to the plugs are made of very brittle plastic and easy to break,so when changing the plugs,be very careful when removing the leads.Also,the plugs are a strange size and a normal plug socket won't fit them.I used a 14mm deep socket,but you have to be careful as proper plug sockets are designed to avoid damaging the ceramic insulation,but a normal socket isn't.......
The leads are built into the coil
pack,so if you manage to break a lead when changing the plugs,you have to replace the whole unit!.Don't panic though,as the whole thing from Renault is only around £35.Also,the leads are numbered so you can't mix them up,but be aware that the French number the cylinders from the flywheel end,rather than the front of the engine like everyone else,so number 1 cylinder is the one nearest the gearbox,number 4 is one nearest the cambelt end.
If you do have to replace a coil
pack,it is always advisable to replace the plugs at the same time.
Hope this helps someone out in the future.