[s-cars] Ignition coil replacement

[Aaron Ryba]

Another solution I just used is to replace the whole she-bang with a D585 (?, or D581) coil setup from EFI express for $425. The coils are sourced from a Chevy Yukon/Suburban application. Pretty good fabrication from Marc Swanson. It is sold as a "plug & play" system but you may have to do a bit of modification to mount the coils like I did. Evidently he is working on an improved mount that connects to the strut tower bar.

No more worries about failing POS or coils.
IIRC you can also make your own setup for maybe $280 (?). The info is in the audiworld archives

Check out the postings on the Audiworld UrS4/6 forum.

Aaron
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Message: 3
Date: Mon, 9 Mar 2009 09:54:16 -0700 (PDT)
From: Graham Hicks <urs6turbo at yahoo.ca>
Subject: Re: [s-cars] Ignition coil replacement
To: "Eyvind E. Spangen" <eyvind.spangen at vwaudi-club.no>,
    s-car-list at audifans.com
Message-ID: <296036.13882.qm at web52202.mail.re2.yahoo.com>
Content-Type: text/plain; charset=us-ascii

No way would I consider running the cover over 1.8T coils no matter if stock or how far from stock the car is.  I have had several 1.8T coil fail without the cover, so I can only imagine how short their life would be with the cover.
There have been a couple of guys on the AudiWorld forum that have stated that the 1.8T harness and V8 S4 coils (077 905 115 S) make a more reliable setup, but the cover still has to stay off.


Graham Hicks
UrS6Turbo at Yahoo.ca





________________________________
From: Eyvind E. Spangen <eyvind.spangen at vwaudi-club.no>
To: s-car-list at audifans.com
Sent: Monday, March 9, 2009 9:03:44 AM
Subject: [s-cars] Ignition coil replacement

The coil pack in my '94 S4 is going bad. It's missing under boost, but
during normal driving and moderate acceleration under some boost, it is
fine. Have tried with different POS'es - no difference, it's one or more
coils/coil wiring. Plugs and the "tubes" between the coils and plugs are
new.


I have found 5 solutions:

1. New OEM coils. Can be had for $120/piece. Expensive, and I still have the
dreaded POS'es that can fail. In the end almost as expensive as the 034 set,
and far less durable. Not an option.

2. 1.8T coil conversion. Less expensive, but I've read that the 1.8T coils
can't handle the heat under the coil cover very good. Is this really a
problem running just a chip on an otherwise stock engine?

3. Used coils off Ebay or something. Can work for many years, or they can
fail again in a few weeks. Impossible to say, and a possible waste of money.
Can be had pretty cheap, though..

4. 034 HO coil set. Technically the best solution, but the price is IMHO
horrible.

5. Replace the wires on my old coil pack and keep my fingers crossed that
the problems are caused by cracked insulation and not the coils. 


I'm considering trying #5 first, but does anyone have any BTDT on replacing
the worn wires - is it possible that it might help? I'm thinking that maybe
a failing wire would have caused a missing cylinder all the time, not only
under boost..

-- 
Regards,
E. Spangen