MSD with Howell TBI -
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post #1 of 5 Old 01-03-2010, 09:20 PM Thread Starter
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1982 CJ7 
Join Date: Sep 2007
Location: raleigh, nc
Posts: 147
MSD with Howell TBI

hey guys, have read 100 posts on ignition upgrades, including the JeepHammer wikipedia, but am still missing something. Have been running a Howell TBI for about a year with great results and just installed a MSD 6A and now she's not cranking.
Per the MSD Troubleshooting guide, I checked and am getting a spark from the MSD. I have an '82 but constantly find its '81 tech (was non-comp carb, independant duraspark).
Only link between the ignition and howell is the white tach wire that feeds the TBI computer. Do I need a tach adaptor inline before the TBI knows whats going on? Any other troubleshooting suggestions?


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post #2 of 5 Old 01-04-2010, 05:39 AM
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I just did a msd 6al install a few weeks back and i was having the same problem as you (although i'm not running tbi) anyway my problem was i was not getting 12 volts from the keyed power source at the coil when the ignition was turned on so i ended up finding a new keyed power source and ran a new line to the msd and now it works everytime (if i could only say that about the mech fuel pump though lol) rember to re gap the plugs too and use a spiral wind spark plug wire i'd suggest aurora wires or another high end wire.
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post #3 of 5 Old 01-04-2010, 08:26 AM
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1984 CJ7 
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Location: Dallas, TX
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I ran into this when I installed my MSD: you have to replace the tach filter in the Howell harness with one made for a multi-spark ignition ... call Howell and they will sell it to you for ~$50, then you will need to unlace part of your harness near the ECM, cut out the existing filter and solder in the new one.
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post #4 of 5 Old 01-04-2010, 09:18 AM Thread Starter
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Great, thanks guys. I'll give Howell a call today.
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post #5 of 5 Old 01-11-2014, 02:45 PM
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82 Renegade,

How did you get yours running? I had the same exact scenario. Howell TBI plus Team Rush upgrade. Worked perfectly. Tried to add MSD Digital 6A including replacement of the tach filter on the computer with one from Howell. Still can't get her to start. Do you have any wiring diagrams you can share? I feel like I am missing one key thing, but just cant trace it.

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