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Unread 03-31-2014, 08:55 PM   #1
Trout54
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1987 YJ Wrangler 
 
Join Date: Mar 2014
Location: Modesto, Ca
Posts: 9
Howell tbi question

Hey everyone

First and foremost I want to introduce myself as the new guy... and I have recently purchased my second YJ in my life and being a little further along in life, I can actually afford to do things I want to it... (Not a high school rig this time)

I recently bought a 1987 4.2l with Howell injection...it's really clean and I like some of the mods the po has done...2.5" lift, 31s, revolving shackles, etc

I have been reading on this forum everyday for a couple weeks now and have already changed the TC to the 231 amc, put new motor mounts in, did a proper fluid change, installed new audio components and the list is just beginning all from info and write ups here. The members on this site deserve a huge thank you from me for the awesome info I have found out and learned already...I have reignited a internal love for jeeps and excited about being part of the community again...so thanks already and in advance.

Now to my first general question...the Howell tbi kit installed on my 87 is awesome so far runs good...however the previous owner had it from his dad who did the install and the tach doesn't read the rpm at all and I was told it's a tach filter problem...I have no experience with this system and I am wondering if anyone has had this problem and what can be the possible solutions?

Thanks again

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Unread 03-31-2014, 09:06 PM   #2
YJ4LIFE
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1989 YJ Wrangler 
 
Join Date: Dec 2011
Location: , San Angeles
Posts: 744
Quote:
Originally Posted by Trout54 View Post
Hey everyone

First and foremost I want to introduce myself as the new guy... and I have recently purchased my second YJ in my life and being a little further along in life, I can actually afford to do things I want to it... (Not a high school rig this time)

I recently bought a 1987 4.2l with Howell injection...it's really clean and I like some of the mods the po has done...2.5" lift, 31s, revolving shackles, etc

I have been reading on this forum everyday for a couple weeks now and have already changed the TC to the 231 amc, put new motor mounts in, did a proper fluid change, installed new audio components and the list is just beginning all from info and write ups here. The members on this site deserve a huge thank you from me for the awesome info I have found out and learned already...I have reignited a internal love for jeeps and excited about being part of the community again...so thanks already and in advance.

Now to my first general question...the Howell tbi kit installed on my 87 is awesome so far runs good...however the previous owner had it from his dad who did the install and the tach doesn't read the rpm at all and I was told it's a tach filter problem...I have no experience with this system and I am wondering if anyone has had this problem and what can be the possible solutions?

Thanks again
Tach reads off positive ignition coil. You can trace the wire from the firewall bulkhead connector to see where it's going or run a new wire to that firewall spot.
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'89 YJ, 4.2L, ax-15, B&M shifter, 1" BL, TJ flares, '99 intake, '91 EFI, 5.0L explorer injectors, GenRight tank & stretch, 35" ProComp Xtreme muds, 52" chevy springs rear, 44044 Ranchos front.....
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Unread 03-31-2014, 09:23 PM   #3
Trout54
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1987 YJ Wrangler 
 
Join Date: Mar 2014
Location: Modesto, Ca
Posts: 9
I pulled the tach out and it has the stock plug harness with four wires...which one needs to be connected to the +ign coil?
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Unread 03-31-2014, 09:56 PM   #4
whiskeywiz
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1989 YJ Wrangler 
 
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Do you have a white plastic horseshoe-shaped clip that slides over the coil?

Going on a hunch that the coil was upgraded...

Sent from my Nexus 7 using JeepForum
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Unread 04-01-2014, 10:59 PM   #5
89yjparrothead
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There is a filter that you might need to get. Call Howell and they will get you taken care of.
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Unread 04-02-2014, 11:41 AM   #6
Berniebikes
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1988 YJ Wrangler 
 
Join Date: May 2010
Location: Williamsburg, VA
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Quote:
Originally Posted by YJ4LIFE View Post
Tach reads off positive ignition coil. You can trace the wire from the firewall bulkhead connector to see where it's going or run a new wire to that firewall spot.
Actually, no. The tach reads the negative coil wire. Here, from the Howell install instructions

AFTERMARKET IGNITION SYSTEMS: If you are running an aftermarket ignition system (MSD, Mallory, Jacobs, etc.), you might not have a coil signal that will trigger our built-in tach filter. If your engine will not start, and you have one of these systems, contact Howell Engine Developments at Ph 810-765-5100 for
assistance.
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Unread 04-02-2014, 11:53 AM   #7
YJ4LIFE
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Quote:
Originally Posted by Berniebikes View Post
Actually, no. The tach reads the negative coil wire. Here, from the Howell install instructions

AFTERMARKET IGNITION SYSTEMS: If you are running an aftermarket ignition system (MSD, Mallory, Jacobs, etc.), you might not have a coil signal that will trigger our built-in tach filter. If your engine will not start, and you have one of these systems, contact Howell Engine Developments at Ph 810-765-5100 for
assistance.
Actually YES I did efi a few months ago. The '89 tach runs off coil positive like cj7's
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'89 YJ, 4.2L, ax-15, B&M shifter, 1" BL, TJ flares, '99 intake, '91 EFI, 5.0L explorer injectors, GenRight tank & stretch, 35" ProComp Xtreme muds, 52" chevy springs rear, 44044 Ranchos front.....
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Unread 04-02-2014, 01:27 PM   #8
Berniebikes
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1988 YJ Wrangler 
 
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Well, not meaning to get into any type of argument but look at the FSM engine wiring diagram. I have the 88 here, it shows a yellow (+) coming from the starter relay (connected to the ignition switch also) to the positive side of the coil. Off the other side (-) of the coil is a green wire connected to the tach and the ignition module. Also, Bill USN-1 over at Binder tech says connect the tach to the negative side of the coil, and it shows that way on his TBI wiring diagram. Maybe it works either way, but all the literature I have shows the negative terminal. Maybe 89 is different?
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Unread 04-02-2014, 06:32 PM   #9
NonRubicon
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Posts: 2,099
FWIW, the Howell instructions indicate:

Quote:
Connect the labeled white wire to the ignition coil negative terminal to pick up a tach signal. NOTE: Multiple spark discharge ignitions require a special Tach filter to function correctly. Contact Howell if you need one.
Here's a link to the Howell TBI installation manual PDF

I have a 1990 4.2 engine, w/Howell TBI. The tach pickup wire is hooked up to the negative terminal on the factory style coil.
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Unread 04-02-2014, 11:04 PM   #10
Trout54
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1987 YJ Wrangler 
 
Join Date: Mar 2014
Location: Modesto, Ca
Posts: 9
Thanks for all the info everyone ...I did some parts investigating under my hood and the Previous owner installed the tfi ignition kit by CRT...I will be calling Howell this week to see if they have a filter for this type of coil

http://www.crtperformance.com/html/tfi.html

Does anyone have any good or bad opinions on this mod?
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Unread 04-03-2014, 01:42 PM   #11
NonRubicon
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What you have is also known as the Team Rush mod. Basically does away with the crappy stock dizzy cap/rotor for bigger Ford style. Runs smoother, less crossfire/misfire, stronger spark.

I have the stock style MSD Blaster 2F coil, instead of the TFI style coil. The mod as a whole made a difference even with the Carter BBD. Helped unlock the higher rpms, smoother idle, basically unleashed the 4.2L. Even better with the Howell.
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Unread 04-03-2014, 04:41 PM   #12
whiskeywiz
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1989 YJ Wrangler 
 
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Location: Buffalo, ny
Posts: 1,047
Off topic, on topic... I'm not sure, but I put an MSD setup on. Tach wouldn't work. In the little research I did I found out that its common, and a filter is needed, and they aren't cheap, and IIRC the filter isn't always a lock for a fix. Could be off on the last point...

Let us know how it works out.
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