[s-cars] Diagnosing 1.8t coil pack failures

[Dave Forgie]

Can't disagree.  I just wanted to find out what a total coil pack
failure felt like (lumpy and no power).  Along the way (last two weeks
or so), I was getting big time missing under boost but fine just
toodling around.

Dave, your experience has been the best yet, longest miles under the
most extreme conditions.  Keep up the good work.  ;>)

Dave F. 

>>> <djdawson2 at aol.com> 09/10/06 09:29PM >>>
I wouldn't see any reason to wait for a total failure.  Since it takes
about 15 seconds to drop in a new coil, I'd just take a new one and plug
it into one cylinder at a time until the miss under boost is gone.
 
All in all, I'm still real happy with mine.  A tad over 15k on the
clock, and no issues yet at 28psi.
 
Dave 
 
 
-----Original Message-----
From: forgied at ae.ca 
To: s-car-list at audifans.com 
Sent: Sun, 10 Sep 2006 11:18 AM
Subject: [s-cars] Diagnosing 1.8t coil pack failures


Well, after a year of driving my 1.8t coil pack conversion experiment,
I
finally (inevitably?) had a coil pack fail. Its been coming on for
awhile, i.e. some missing/ hesitation under boost (24 psi plus) but
nothing in "normal" driving.  Just like a "real" coil failure mode. 
Like the OE system and a POS failure, you can't find the offending
cylinder until you get a total failure, i.e. a failure at idle.  As a
result, diagnosing which cylinder is the problem is the same as
tracking
down a OE POS channel failure:  1) Remove the injector cover 2) Start
the engine (in neutral with the hand brake on) 3) pull the injector
connectors one at a time. Since you will be going from a 4 out of 5
cylinder mode to a 3 out 5 mode, it is very clear which cylinder has
the
problem.  In my case, based on other failures, I was willing to bet it
would be no. 5.  Wrong:  No. 3.  Solution: disconnect the coil pack
from
the harness, pull coil pack, remove rubber "seal" ring from dead coil
pack, add seal ring to new coil pack, insert new coil pack (to engage
the hex part of the plug), reconnect to harness, start car. 
Purrrr.....Total time from removing injector cover to finish: 5
minutes
(and some of that was wiping dirt off the fuel rail).  Now to find out
whether the 115 R coil packs are really any better.

Dave F. 


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