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post #1 of (permalink) Old 08-31-2000, 03:05 PM
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I have not posted here for a few weeks and since there seems to be a lack of Jeep discussions I thought that I would share where I was at with my re-store and modifications.

∑ Spent the last 9 months rebuilding and painting my 1984 CJ7.
∑ Already had the Howell fuel injection I think that I first learned about it in the Jeep Bible but you can find more info here:
∑ Applied the Durabak in the bed and underbody learned about Durabak from this web site:
∑ Chevy Blazer heater motor upgrade. I believe that I also found that info on the jeep projects site but I canít find the link for you right now.
∑ Borla Headers 17019 for 91-92 for Wrangler 4.0 head
∑ Put a 4.0 head on 258I six found this idea on John Foutz web site:
∑ Did the Team rush distributor and coil upgrade I learned about it from a Howell e-mail board that I belong to that I signed up for a few years ago it is on the jweir tbi site After getting the link from the Howell e-mail I found my way to this board and read about the upgrade for several months until I had the restore ready to try. It worked great. I also purchased the MSD off-road ignition module but have run into a problem trying to use it. I am still working on that attached is a copy of some correspondence of where I am at with the MSD module.

I installed the MSD-Off road electronic ignition.

The Jeep wonít run.

1st tried just hooking up to 4 coil wires. No Run
Tried installing the Tachometer adapter couldn't figure out what wire from MSD was
The Tachometer signal. Tried to use the gray wire first no run. Then tried to use
The white wire no run.

I have made the assumption that the white wire from the coil is the tachometer
Signal to ECM) not the green wire with the in line connector) Doe's anyone
Know it this is true.

Then I looked at the duraspark module. There are Orange/Purple/Black wires so
I started to think that it has been running off magnetic pickup so I used
The magnetic pick up wires on the distributor of MSD. It would start but not
Run. So again I set up the MSD 8920 Tachometer adapter. Now wonít start.

I am real sorry that I have spent the $300.00 to try to get a better
Ignition module. Do any of you have any suggestions?

Thank You
Cindy E. Allen

Cindy and anyone else thinking about running an MSD,

I love my MSD. It took a while to figure out how to make it
Work with the EFI but now I got it figured out.

I talked to Troy at Howell and tech support at MSD and they
Each recommended a different tachometer filter/adapter. As it
Turns out, NO tachometer filter is required on a GM EFI system. (As
Stated in the MSD installation manual)

This means that if you want to put an MSD on a Howell
System, you must remove the existing tachometer filter. Howell
Puts the filter in the harness near the computer plugs.
Remove the tape and you will find a small square thing with
Four wires. I don't remember the wire colors, but I will
Describe it the best I can. Two wires splice into wires in
The harness, the third wire goes away from the computer, and
The fourth goes to the computer. Cut the two wires at the
Splices and tape them (they are no longer used), then splice
The third and fourth wires together so the wire from the
Tachometer signal on the MSD goes directly into the computer.
Also make sure the tachometer signal wire going to the MSD is on
The tachometer output of the MSD box and NOT on the coil.

After too much research and trial and error, I found that this
Is what works and it's easy and cheap. I've been running
The same MSD box for several years (carbureted and injected)
With no problems at all, and believe me it gets abused. I
Had to replace the Duraspark module about once a year when I
Was running that system. I was very happy to throw that
Thing in the trash for the last time. By the way, I highly
Recommend using the 'magnetic pickup' rather than the 'white
Wireí installation for the MSD so you can eliminate the
Stock module.

I hope this helps.
Derek McCabe


The brown wire coming out of the off-road ignition is the tachometer wire. This
Will attach to the white wire of the tachometer adapter.


MSD tech

This e-mail is from MSD but I still think that the gray wire is the tachometer signal. What do you guys think?

1984 CJ7
Howell Fuel Injection
258I W/4.0 Head
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