Hi,

First newbie question for the vRS!

EML came on, so I scanned it and got errors 16684 and 16686. Misfire on Cylinder 2 so thought I'd change a coil pack there.

 

If you look at the engine from the front, as in, the driver's side is your left hand side and the passenger side your right I changed the 2nd coil pack on the left, believing that to be cylinder 2.

The problem has re-appeared, and I was wondering if I've changed the wrong one? Is cylinder 2 the 2nd on the left from the view or the 3rd?

 

Cheers

 

James

Number 1 cylinder is cambelt end rather than gearbox end, so looks like you changed the correct one. Was it A vag coil or a pattern part.

Was a Bosch coil from Eurocarparts, will probably just take it to the garage tomorrow to be fair, see what they say but it's annoying as I've just replaced it!

Have you checked the wiring?

If you swap the coil to number 3, does the fault code move with it?

When I changed it before I put it in 3 and the code didn't move. In fairness I wouldn't really know what to check with the wiring, any tips?

If the fault code does not move, then the fault is likely to be in the short loom that connects to the coil itself. These tend to crack due to heat and short out. if you can see cracks in the loom try wrapping that section in electrical tape and repeat the code read. it may permanently cure it, or if not, you are going to have to have that section of loom renewed I'm afraid

 

If you check out Bowders picture on post number 30, http://www.briskoda.net/forums/topic/193003-coilpack-wiring-heat-shield/?hl=+coil%20+loom     that is the loom in question to check, also check that the little earth tag is making a good earth, although if there was a fault there, I would expect it to affect all 4 coils really.

Nice one will have a look in the morning! Are they expensive to replace?

To do a "Proper" job of it, the loom is replaced all the way back into the main loom itself, however, some garages do section it in. Anybody that I've come across that has had the section repair has had intermittent problems afterwards. Basically, the choice is yours.

 

Perhaps others on here have had this done and can comment to provide some balance for you to decide?.

Some more info for you -

 

http://www.briskoda.net/forums/topic/127450-coilpack-wiring/?hl=%2Bcoil+%2Bloom+%2Brepair#entry1602936

 

http://www.briskoda.net/forums/topic/297177-finally-cured-misfire/#entry3534890

Dont rule out the spark plug being faulty, could be worth removing it and seeing what state its in.

For me I'd check the plug and replace as its a cheap enough item if even a slight doubt with them followed by checking the wiring! I've never had issues with new sections of wiring!

Good call, always check the easy stuff first.

For me I'd check the plug and replace as its a cheap enough item if even a slight doubt with them followed by checking the wiring! I've never had issues with new sections of wiring!

I agree, neither have I when I've done it myself, but having seen some examples of some garage's handywork  on this, their ambitions, definitely exceed their talents.  

Ended up taking it to Autotecnic in Sheffield, were absolutely brilliant to be fair and checked the engine over for me. They recommended the spark plugs be changed as the service book doesn't detail when they were last done, having done so turns out spark plug 3 was finger loose and covered in carbon! Replaced all of them and it's running brilliantly again.

 

Cheers for the help everyone, if I had the car a bit longer I'd be doing more digging myself but you're never quite sure how a new car's supposed to run!

Cheers

Just a quick update with this.

 

The EML came back on, so I took it to another garage who did a cylinder leakdown test, more diagnostics etc...

Eventually pinpointed to a bit of a dirty injector on cylinder two and someone hadn't quite seated it properly when messing with it before. 

 

They sorted it for me and ever since it's run fine! Only done about 100 miles since but hopefully that'll be the end of it!

 

Cheers