Ignition Coil Pack?

[lb80vr6 0]

Hi,

 

I've been struggling recently with an occasional misfire on my '95 Corrado VR6. I've so far fitted new spark plugs and ignition leads (leads seemed to make it better) to try and resolve the issue. It appears to misfire more often when it;s wet and at low revs. I'm starting to suspect there might be a hairline crack in the ignition coil pack which could be causing this...damp getting in maybe? It looks like the original coilpack, so it'll be 17yrs old now....

 

Firstly, I've been quoted about £280 for a new coilpack from a VW trade parts specialist, which seems a tad pricey. Does anyone know anywhere better to get a decent replacement coilpack for a VR6?

 

And secondly, does anyone have any ideas of other causes of this misfire problem (im sure there's loads), but any that maybe common to Corrado's, maybe somewhere else to start looking for the problem...?

 

Im kind of cautious about just replacing the coilpack in case it's something else that may well be an obvious cause!

 

Any help much appreciated!

[Wullie 1]

From previous posts on the forum the usual test for the coilpack is to spray it lightly with water when it's dark with the engine running and watch for sparks/tracking. Some have mentioned using resin to repair them. Try using the search for more detailed info.

 

Edit:- Check the second reply here:- http://direct.the-corrado.net/showthread.php?1036-popping-under-load&highlight=%2Bcoilpack+%2Bresin

Edited June 30, 2012 by Wullie

[Stonejag 10]

From previous posts on the forum the usual test for the coilpack is to spray it lightly with water when it's dark with the engine running and watch for sparks/tracking. Some have mentioned using resin to repair them. Try using the search for more detailed info.

 

Edit:- Check the second reply here:- http://direct.the-corrado.net/showthread.php?1036-popping-under-load&highlight=%2Bcoilpack+%2Bresin

You can get a pattern one from GSF for around £80. Unfortunately for you I ended up taking mine back before fitting it, as putting some Araldite over the crack in my spare one sorted it out :)

 

Mine didn't arc noticeably when misted with water before it failed so that's not a foolproof way to do it. It's not the cracks that are the problem, the issue is that the interior insulation around the coils breaks down and releases the expanding foam they're filled with (to protect against insulation breakdown) and the foam's expansion cracks the outer case. You may be lucky enough to get away with waterproofing the outside to prevent more water ingress and relying on the foam, that's why my one started working again...

 

And yes, my symptoms were a loss of one cylinder in the wet, as water was flicked up off the road / sucked through the grille. Sounds a lot like a Subaru! Eventually you'll lose two cylinders when one of the coils goes completely and you'll have so litttle power / so much vibration that it'll be totally obvious what's up.

 

Stone