[s-cars] Bumfozzled yet again

[Robert Myers]

A while back my urS6 (RS2ed) was having a miss under high boost.  Also an 
additional miss when the engine was stone cold.  This second miss would go 
away after driving a couple hundred yards and the engine started to warm up 
a bit.  The problem was solved by pulling the coil pack and carefully 
re-insulating the wiring harness where it entered into the coil 
pack.  Felling good.  ;-)

A week later - Oh nuts (or something like that) - the miss is back - 
cylinder #4.  I pulled the coil pack again and checked the crimps, of which 
I was pretty sure, and found no problems.  I put it back together and the 
miss was gone.  Hmmmm...  Something loose inside a crimp?  Maybe.  Moved 
the PSO connectors to their alternative positions.  The miss moved to 
another cylinder.  Hmmmm...  Bad PSO.  So, let's switch #4 to the "spare 
channel".  Pull the coil pack yet again.  As I lifted it off the top of the 
engine one of my crimps I was so proud of separated.  Guess which lead it 
was part of.  Yup - you got it - #4.  How about that!

So.  Redid the crimp.  Good and tight this time.   Put the coil pack back 
in the car.  No miss!  Great!  Absolutely loads of power.  Drove the car 
about a half mile while it performed like a champ.  Turned around to head 
back home and 200 yards later - whoops!  A miss again.  Something is amiss 
- again.  This time the miss is in #2.

Pulled the coil pack - again.  Measured resistances between corresponding 
"firewall connectors" for each cylinder.  First I had to be sure exactly 
which connector pin corresponded to which cylinder.  They are no longer in 
factory order due to several PSO changes and spare channel uses over the 
years.  In checking I pulled each wire from one end of the wiring harness 
to determine which wire at the other end was the same wire.  Resistance 
measurements were #2 through #5 = 0.6 ohms.  #1 was 1.2 
ohms.  Hmmmm...  Problem with #1?  Maybe.

Put the coil pack back in the car to determine location of the miss after 
swapping PSO leads again.  Fired it up.  No miss.  Swapping PSO lead will 
accomplish nothing.  Went for a test drive, repeating the earlier 
drive.  No miss at all.  Performance is fantastic - as usual (when there is 
no miss).  Just guessing but perhaps pulling on the wires may have seated a 
wire inside a crimp more tightly and resulted in better contact.

OK, what now?  Huh?  What's that?  You say, "Shut up and 
kwitcherbitchen?"  Well, I'd like to do that but sure as shooting when/if I 
do my wife will be out in the car and the miss will suddenly reappear.  I 
want to SOLVE and CORRECT the problem.  Suggestions?


Bob
Random Bushism: "It's going to require numerous IRA agents."  George W. 
Bush, On Gore's tax plan, Greensboro, N.C., Oct. 10, 2000
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Robert Myers  304-574-2372
Fayetteville, WV
urS6 - Cashmere Grey
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