[s-cars] Ignition coil replacement

[Robert Myers]

Also possible knock sensor problem, Teddy.  That's how the ECU 
handles a signal from a knock sensor.  It instantly dials back the 
timing advance and power drops briefly.


At 04:44 PM 3/9/2009, Theodore Chen wrote:

>i take it this is the one:
>http://www.efiexpress.com/catalog/product_info.php?products_id=18
>
>at 168k miles, my car doesn't have any obvious misses, but sometimes 
>there is a noticeable, abrupt drop in power under acceleration that 
>goes away a few seconds later.  i suspect an ignition coil or POS is 
>gradually failing.  i haven't gotten around to replacing anything 
>yet, but the LS2 coil conversion seems like the way to go.
>
>
>
>----- Original Message ----
>From: Aaron Ryba <aaronryba at yahoo.com>
>To: s-car-list <s-car-list at audifans.com>
>Sent: Monday, March 9, 2009 1:11:50 PM
>Subject: Re: [s-cars] Ignition coil replacement
>
>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
>--------------------------------------------------------------------
>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
>
>
>
>_______________________________________________
>S-CAR-List mailing list
>S-CAR-List at audifans.com
>http://www.audifans.com/mailman/listinfo/s-car-list
>
>_______________________________________________
>S-CAR-List mailing list
>S-CAR-List at audifans.com
>http://www.audifans.com/mailman/listinfo/s-car-list
>
>No virus found in this incoming message.
>Checked by AVG - www.avg.com
>Version: 8.0.237 / Virus Database: 270.11.9/1991 - Release Date: 
>03/09/09 07:14:00