My wife thinks our 93 wagons transmission is going. Its kind of
making an intermittent jerking. It smelled like a motor problem to
me, so i said i would look at it latter. The next day she calls me,
car dead on the side of the road. I said "AH, i know what this is"
Grabbed my spare TFI module, special tool, 10 MM with extensions
timing light and head off to the dead animal. Put the timing light on
it, no display. So i swapped out the TFI module and thought all was
well. Tried to start it, still dead, no timing light, no spark.
Shit, did not bring the manual or more tools so back home for round
#2. grab my shop manual more tools and DVM. And my kit of salvaged
taurus parts (You find a donor, grab what you can).
Checked out the voltage to the TFI module. It was OK. I was beginning to
think it was the pickup, then it struck me i have a ignition coil with
me and it would only take a minute to swap it in.
Swapped the connector and the HV wire and the car started right up.
So, i swapped the donor coil in and thought all was well. I did not
smell a bad coil on this one. The car drove home OK, but the stutter was
still there. Waited until it was dark and looked under the hood at the
plug wires. There i saw the strangest display of intermittent arcing and
wire corona i had ever saw. It appears the plug wires were causing the
stumble and took out the coil. So, i changed out
the plug wires this morning. It seems to be OK now, but time will tell.
The night trick worked out well to see if the plug wiring is arcing to
Morel of the story, be careful of what conclusions you jump to and
what parts you change. For some reason, the TFI module on a 93
cost a hell of a lot more than the one on my 90 did. I am glad i had
my supply of donor parts laying around to swap.
The only other issue i have not got a good answer on is plugs.
I had previously put motorcraft double platinum plugs in this 3.0
because i got a screaming deal on them. After the fact, i found out
they used the double platinum on the cars with coil pack ignition.
This car uses the old distributor method. Does not use waste spark.
Does anyone know if the double platinum plugs are used on a motor with a
distributor instead of a coil pack could cause a problem? This 3.0 came
OEM with single platinum.