mark@wrx

Is there an easy way to test coilpacks from early cars to see if they are still working 100% and aren't failing?

WHYAYEGTI

Remove coilpack and then pull off rubber boot and visually check for any hairline cracks in the bakerlite material on the tip that covers the spark plug. If there is a crack throw away and replace it.

Thanks

Gavin

mark@wrx

I believe it is also possible for them to stop functioning properly internally rather than a structural failure. There must be a way of checking the current passing through the coil. Anyone got any ideas?

DaleR

use a ohm meter, check reading is correct across the terminals, then check from coil output to terminals,. check they are in spec.

andy97

iTrader: (1)

May be a flash test from a PAT tester

Subersonic

if you can pull them of with the engine running and there is no change in engine running thats the bad one. this method worked on my fto dont know if you can do it on a scoob

nzkenny

WHEN YOUR HEAD HITS THE BONNET YOU KNOW IT IS WORKING? OUCH!

Subersonic

sorry but you should'nt get a shock of a coil pack maybe thats your problem they are supposed to be insulated

Ritch96

Thats assuming that the thing is completely cattle trucked?

My experience with failed coil packs - had all of them go now - is they don't fail completely. Especially true if its down to the cracking thing. Most of the time the charge will still get through. Mine stuttered when taking up the power gently in 2nd and also very occasionally when under boost.

I did all the internal checks with a multimetre, sure the details were all on here, complete with diagrams. There were two different tests, all my coil packs passed these despite 2 being visibly badly cracked.

Replaced these and all was well, then several thousand miles later the problem returned, on inspection one of the remaining original two was cracking. Replaced this - problem solved.

Guess what happened a few thou later??

Car has run like a dream for the last 15k now since replacing, they all failed around the 75 - 80k

Ritchie.