[s-cars] Ignition coil replacement
Robert Myers
bob at chips-ur-s.com
Mon Mar 9 14:54:37 PDT 2009
How about trying a can or two of octane booster stuff and see if that
helps? I don't know if I'd want to add the stuff all the time but it
might help diagnostics.
Bob
At 05:51 PM 3/9/2009, Theodore Chen wrote:
>true. i left out one tidbit: after a long steep uphill grade in
>1st/2nd gear that caused the coolant temperature to rise (but not
>into the danger zone), the engine was misfiring badly.
>
>that might not be related to this power dropoff, though. it might
>be a knock sensor problem, all right, but not the fault of the knock
>sensor. after all, we get only 91 octane out here. :(
>
>
>
>----- Original Message ----
>From: Robert Myers <bob at chips-ur-s.com>
>To: Theodore Chen <tedebearp at yahoo.com>
>Cc: Aaron Ryba <aaronryba at yahoo.com>; s-car-list <s-car-list at audifans.com>
>Sent: Monday, March 9, 2009 1:53:28 PM
>Subject: Re: [s-cars] Ignition coil replacement
>
>
>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
> >
> >
> >
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