K4M Faulty Pencil Coils

[Beef-Mc]

Are t common signs of these failing things like making the car shake at idle, shudder when accelerating, give out a sulphur smell from the exhaust and put a flashing emissions light on the dash?

 

[Alastair.]

sound like a coil down mofo, misfire type symptons

 

[Beef-Mc]

Well it's either a coil or the lambda sensor so this is easier this way. best bit to check them is to take them out one at a time aint it?

 

[Alastair.]

yea, engine running, unscrew the 10mm bolts or t30 screws whichever it has holding the coils down, then lift them out one at a time.

 

[Beef-Mc]

Take if when the engine note unchanges after taking one out then thats the shagged one.

If I take all of them out and nothing changes, any idea's what to change next?

 

[Dink]

i think it's easier to unplug the supply cables to the coils rather than unbolting them (thats what i did in the car park of cardiff renault lol)

yeah it will cut out most probs if you unplug a good un and not change on the bad un

but it did sound like a pulse jet on the drive there lol

 

[steviet]

Apparently you cant test for faulty coils by un plugging them, something to do with them sharing a voltage, un plugging one shags the other one... best bet is to undo the screws holding the coils in and remove them one at a time while the engine is running and holding the tip against the fuel rail guard (or a metal bit of the engine) I wound up changing the full set for peace of mind, as not one of my 4 old ones were the same as another!!

 

[Dink]

i wouldn't of thought they would share a voltage as that would mean they fire in pairs

 

[Alastair.]

u can test them just by unpluging them.

 

[Beef-Mc]

Going out to test them the now, if I manage to electocute myself I'm holding you guys responsible lol.

 

[Alastair.]

will be fine if ur just lifting them out, as above if the engine doesnt react to you removing the coil, then thats your faulty one.

 

[Beef-Mc]

Done, number 1 from the clutch makes naff all difference, so that's going to be replaced.

thanks for your help guys

 

[Beef-Mc]

Pencil coil replaced and the car is back to normal, cheers for the help guys.