All Things Mk5 > How to Guides / Troubleshooting

Suspect coil pack - Failure

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Caspersmith:
Just after peoples thoughts.

Changed my spark plugs today, bought the NGK Iridium ones from Awesome GTI.

Straight forward swap, noticed on the 1st pack I pulled had wierd rust type stuff on the end, pulled the spark plug out & that was the same.

Ran out of time today but will pull the plug whilst the engine is running tomorrow.

Wondered if anyone has experienced this & it's just the pack.

The clean spark plug is what the other three looked like.


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pudding:
You water ingress on that cylinder.  Check the seals on the coilpack.

Caspersmith:
So I changed back to my old spark plugs, car is running right as rain again??

Just spoken to Awesome & they're saying BKR7EIX plugs are for mapped cars & that I should've got the BKR6EIX?

Sure I've read that 7's are the ones to have & 8's are for stage 2 +.

Bloody annoying as I can't send them back now!

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Caspersmith:
Phoned them again as I double checked there website, the plugs are for stock & tuned engines.

I'm sending them back, they're going to check them out.

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pudding:
I use those on my standard engine and it runs better than the stock plugs.  I crossed referenced the oem plug on NGK's website and it's also a heat grade 7.  I don't know why the tuners say Iridium 7s are for tuned only, it's not true.

Not sure why yours doesn't like them.  Did you push the coils down hard?  The 'click' isn't as positive as the OEM plugs.

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