I purchased the MSD coil upgrade kit, swapped out the coil pack, new spark plugs / wires, fresh oil / filter. Fired her up and she purred like a kitten.
You can also spring for the MSD coil, about twice as much but the boots are attached better I think, where the OEM part might have the boots rip off or the springs get caught up.
I replaced the coil with a MSD high performance which was actually cheaper than any other brand, and had significantly better boots on it to keep the water problem from happening again. Haven’t had an issue in 2 years.
I found some coils made by denso 673-9303 (i.e. Toyota) on Amazon for around $18 each. They've been troublefree since I put them in about 1K miles ago. My original Audi coils had 81K miles on them. They greatly improved the low speed shift quality and idle smoothness after I put them in.
I replaced the old ignition coil with a Denso one. The car is running great after the replacement.
I got MSD Street Fire coils to replace mine and its been 4 months so far and they're running strong.
I have used the blaster w a stock icm (the inductive version) and also with a 6al (cdi version). Both worked well over for 400whp with a stock dizzy.
Make sure to spend a little extra and get the Denso brand coil. The cheap one don't last very long.
Short answer - it was the ignition coil. In the end - it serves as a reminder that just because a code (or lack of) seems to point to a specific component, you MUST diagnose. ECM costs $300 - $1000 including coding - a Denso ignition coil was just over $100.
I ended up with this MSD when I bought Tim's motor and the MSD finally crapped out after about a year of me driving with it. In running a coilpack, I notice no tangible difference between the two. Yes, the MSD looks really, really cool...but if you ain't worried about looking pretty, spend your money elsewhere.
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