TeamRush or CJ Dave - Off-Road Forums & Discussion Groups
Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

 
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post #1 of (permalink) Old 06-06-2000, 06:26 PM
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TeamRush or CJ Dave

I have collected all but the MSD6 module. I have Howell fuel injection and am a member of the howell user group. I just received this message. What do you make of this? Am I going to have trouble getting the think running after the conversion. If I do I will be at it a while finding the problem because we have been rebuilding the jeep since December. adding 4.0 head, rebuilding the engine etc. If the Jeep doe's not start up I am going to catch a lot of slack from my Husband that has gone along with all of my Upgrade ideas.

Howell_TBI - http://home.att.net/~jweir/tbi/inject.htm

The following is a list of e-mails between myself and Troy
at Howell. I thought it might help anyone running an MSD
that is raving problems. It seems to apply to the message
titled "misfire problem???"

I wrote:
Troy, I have been dealing with you on the phone recently.
My first problem was with a "rev limiter" effect at about
3800 rpm. You said it was a problem with the MSD, so I
checked with them and installed an MSD tach adapter part
number 8290. This solved the first problem, but caused the
fuel injection to be very very rich. You have since sent me
two chips with progressively leaner programs with very
little change. I tried disconnecting the tach adapter again
and it is now a little lean, but again won't go past 3800
rpm. It seems that without the tach adapter the computer
does not read all the pulses, and with it, the computer
reads too many. I have been reading a Howell Fuel Injection
message board that I found on-line and some of the other
customers with the same problem received a tach filter from
you that worked with the MSD. If this is true, I need one.
Also, I read that there is already a tach filter in the
harness that the new one will replace. In the MSD
installation manual they say to disconnect the stock tach
filter on a GM vehicle with EFI. If there is a filter in
your harness, maybe I should try disconnecting it before we
try adding more stuff. If this is possible, let me know
where it is and what to do with it.

Troy wrote:
Check to see if an orange wire is in the B5 location of the
ECM. This will tell us what type of filter you have in your
system. The B5 is in the smaller connector, bottom row, and
looking at the connector as it is plugged into the ECM, read
from right to left, and count five locations to the left.

I wrote:
The wire in B5 is a light purple, almost pink.

Troy wrote:
We need to supply the MSD tach filter for your system. Give
me a call if you can. Or I can just send one to you on a
core charge of $30 until we get the old one.


I called Troy and the new filter is on the way. He did not
charge the core when I agreed to return the old one. In the
mean time I replaced the MSD with my old duraspark as an
experiment, and everything worked fine making me very
optimistic about the new filter. I will let everyone know
the results of the new filter when I get it. Thank you all
for the information you have put on the message board. It
has been a big help!


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1983 CJ7
Howell Fuel Injection
4.0 Head
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post #2 of (permalink) Old 06-06-2000, 07:33 PM
 
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Re: TeamRush or CJ Dave

I'd give a buffalo nickel to see the wiring diagram you are using to connect the MSD module...
Any way to draw it or scan it and send it to me or post it?

My guess there is a way to hook up the MSD with out the filters, but you will have to leave the DuraSpark module in the system...

If you could provide that diagram, I'd sure like to see it...

"I Have The Body Of A God... Buddha"
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