Changing injectors on a Clio MKII

[rufnek2kx]

Hi Guys,

My clio has been juddering a lot recently on idle, I narrowed it down to a misfire on the fourth cylinder. The leads have been checked as well as a compression test on the cylinder in question and no problems seem to have arisen from them. I took it to a mechanic and after finding out the above, he said it is probably a faulty injector. I think this makes sense as I have read on this site that if it was the coil, 2 cylinders (first and fourth) would be misfiring together.

I have bought a 2nd hand rail + injectors for an X reg (mine is V) and I was just wondering whether the injectors could simply be swapped? I know that the ECU sends a signal to the injectors, but will it cause more problems if I swap them or should it work fine?

A second option I have thought of is to remove all 4 injectors that are in the car and get them ultrasonically cleaned. Has anyone done this before and is it any good or just another gimmick?

Any help at all is appreciated.

	ECU Electronic Control Unit In automotive electronics, an electronic control unit (ECU) is an embedded system that controls one or more of the electrical subsystems in a vehicle. Some modern cars have up to 70 ECUs.

	Ignition Coils Ignition Coils An ignition coil (also called a spark coil) is an induction coil in an automobile's ignition system which transforms a storage battery's 12 volts to the thousands of volts needed to spark the spark plugs. This specific form of the autotransformer, together with the contact breaker, converts low voltage from a battery into the high voltage required by spark plugs in an internal combustion engine. In older vehicles a single (large) coil would serve all the spark plugs via the ignition distributor. In modern systems, the distributor is omitted and ignition is instead electronically controlled. Much smaller coils are used with one coil for each spark plug or one coil serving two spark plugs (so two coils in a four-cylinder car). These coils may be remote-mounted or they may be placed on top of the spark plug (coil-on-plug or Direct Ignition). Where one coil serves two spark plugs (in two cylinders), it is through the "wasted spark" system. In this arrangement the coil generates two sparks per cycle to both the cylinders. The fuel in the cylinder that is nearing the end of its compression stroke is ignited, whereas the spark in its companion that is nearing the end of its exhaust stroke has no effect. The wasted spark system is more reliable than a single coil system with a distributor and cheaper than coil-on-plug. Where the coils are remote mounted they may all be contained in a single moulded block with multiple high-tension terminals. This is commonly called a coil-pack.

[rufnek2kx]

Anyone?

[bedford561]

swapping all the injectors should be fine but you must swap all 4 as they should be flow matched from factory.and unlike the dci injectors they dont need to be coaded by renault.

second of all no ultrasonic cleaning isnt a gimmic i had mine done on my track civic type r and they work perfect now but its not cheap and i think there are only a couple of places that can do it i used abp motorsport to do mine and i belive they sourced it out to a company in derby.

[Ralph]

If the injectors are not coded and I don't know if they
are then you could try swapping the bad one over with
one of the others see if the miss moves with it.

[Lagdti]

Have you swapped the coils around?.If not,I'd do this before getting involved in changing the injectors.

If the coils check out OK,then you can swap either one or the complete set of replacement injectors you have.

	Ignition Coils Ignition Coils An ignition coil (also called a spark coil) is an induction coil in an automobile's ignition system which transforms a storage battery's 12 volts to the thousands of volts needed to spark the spark plugs. This specific form of the autotransformer, together with the contact breaker, converts low voltage from a battery into the high voltage required by spark plugs in an internal combustion engine. In older vehicles a single (large) coil would serve all the spark plugs via the ignition distributor. In modern systems, the distributor is omitted and ignition is instead electronically controlled. Much smaller coils are used with one coil for each spark plug or one coil serving two spark plugs (so two coils in a four-cylinder car). These coils may be remote-mounted or they may be placed on top of the spark plug (coil-on-plug or Direct Ignition). Where one coil serves two spark plugs (in two cylinders), it is through the "wasted spark" system. In this arrangement the coil generates two sparks per cycle to both the cylinders. The fuel in the cylinder that is nearing the end of its compression stroke is ignited, whereas the spark in its companion that is nearing the end of its exhaust stroke has no effect. The wasted spark system is more reliable than a single coil system with a distributor and cheaper than coil-on-plug. Where the coils are remote mounted they may all be contained in a single moulded block with multiple high-tension terminals. This is commonly called a coil-pack.