Pulled this off the Dodge trucks newsgroup......
'92 Dak CC 2wd 318 3.55
'84 GoldWing Interstate
Post follows....
"
I also installed an MSD 6AL in my 98 Ram and thought the truck was
running flat. So I scanned the computer and found code #0351 'primary
coil failure.' The computer was not getting the feedback from the coil
through the MSD. I called MSD and they sent me a tach adapter (#8910),
which I installed with the included diode.
This solved the problem and brought the performance back up to where it
should be. I just returned from a 1200 mile trip and am going to scan
the computer to make sure that the code hasn't popped up again. If it
has then I will have to go with the 8910HV tach adapter.
Anyone who has a MSD or Jacobs ignition should have their computer
scanned for this code. I hope this helps you out.
B. Kempke
"
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