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some more ideas:
1.) The thread : Some guys don't use the good antiseize stuff
which has also some conducting elements in it.
If they use some cheap antiseize on the thread it might be an insulator.
2.) The top head : Some plugs have the top (where the wires are going)
fixed and Bosch ,I think, has it removable as a little cap you can unscrew.
Now these little caps must be really tight !
3.) look inside the wires to make absolutely sure no cap is lost in the wire.
That is no joke. It happen to me when I bought my car. One wire was a little
"loose". The reason was the cap was separated from the plug.
4.) Maybe during the changing back and forth you touched/moved something.
If one or more of the plugwires have broken leads in some position there
is a spark in some other littlelittlebit different position no spark.
5.) Check the primary cable coil-distributor very carefull.
When you change the 4th plug you might touch that wire.
6.) The weak spark problem might be only the symptom. Maybe the platinum
plugs have a little bit better spark to start the engine. But the real
problem might still exist. In the moment I can only think about ignition sensor in the distributor, the amplifier and the coil. Speaking about the amplifier,
a bad ground at the fender affects the amplifier.
My car ran very unstable at idle until the distributor with the ignition sensor was changed. Now it has a stable 800 rpm. Before it was 900 +/- 200.
If I remember right the 90 model have sometimes computer problems. Ground?
Check the FAQ and the archive about Eprom upgrade.
Some other gurus might help you better than me in that.
--
GN Long Beach 745 1986
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