My 86 CJ7 junkyard TBI - JeepForum.com
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post #1 of 45 Old 04-02-2011, 02:21 PM Thread Starter
bdb86cj
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My 86 CJ7 junkyard TBI

I started a junkyard TBI upgrade this winter. I want to share my progress so far and also include some notes that I have gathered along the way.

I used these sites to help me along.
http://www.binderplanet.com/forums/s...ad.php?t=47254
http://www.viciouscustoms.com/TBI/junkyardtbi.asp.htm

-Started with Team Rush Upgrade

-Pulled parts from junkyard.

1.TBI from 91 Chevy S-10 w/ TPS and IAC still attached.
-any TBI from a 88-92 chevy 4.3FI van truck or suv will work. 8th letter in vin# is Z. Some TBI's have small plugs for the TPS so I would keep whatever connector was with the TB that you pull so you can splice it into whatever harness you get.


2.Harness from 1992 Chevy S-10 Blazer, w/ MAP, fuel pump relays, junction block, coolant temp sensor
-any harness from a 88-92 chevy 4.3FI van truck or suv will work. 8th letter in vin# is Z. The harness from a full sized pick up is easier to get to but you will have to do more prep work with it once you get it out.

3.ECU (127747) from 1990 Chevy S-10 Blazer
-I know other ECU's will work but Howell suggests this one and its a proven good place to start. Once again you can find these from a 88-92 chevy 4.3FI van truck or suv. 8th letter in vin# is Z. Make sure your check the numbers after to pull it so you have the right one.


-Bought Parts from Auto Zone

1. TBI Rebuild Kit (auto zone #96-3013A)
-Follow directions here Step 3
*notes* this kit now comes with new filters that fit at the base of the injectors, as well as two different fuel meter body gaskets so you will not have to trim.

2. New O2 sensor (auto zone #11027)
-If you have an 02 sensor in the exhaust of your jeep already you can keep it or get a new one. If you dont have one you will have to weld an 02 bung into your exhaust. (auto zone ##534-49) For 02 sensors in the exhaust use a single wire one, or get a 3 wire heated one if you put the sensor in your header. The wiring harness will have a 3 wire connector but if you have a single wire sensor you just have to use the wire that goes to the ECM.

3. Fuel Pump (auto zone #E2182)
-or you can pull an E2000 from a 85-89 Ford F250

4. Fuel filter (auto zone #FF679)
-any fuel filter with a 3/8" in and out should work

5. GM ignition control module 8-pin (auto zone #DR140)
-this will replace your stock ignition control and will hook up between your coil, distributor and ECM so that the ECM can control the spark.

Started work

-Cleaned the TBI with carb cleaner and rebuilt with new gaskets, washers, filters and O-Rings.

-Laid out all the wiring harness and connected all the sensors that I had. I then went wire by wire, starting at the ECU, and labeled everything that I was going to keep. I thought this would be really hard but once I got started it turned out to be pretty easy as long as you take your time. I then cut out everything in the harness that I wouldn't need. Pin layout and instructions here

I will not be using a knock sensor, vehicle speed sensor, or EGR system

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post #2 of 45 Old 04-02-2011, 03:44 PM
Havasu Living
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Did this 5 years ago. Like ya said, follow all the info on the net and you'll be good to go. The TBI led to the next step, V8 5.0 swap.

80 CJ7 5.0 Dual Exhaust, T176, D300, D30 w/ true trac, AMC 20 w/ ARB 4.56 gears, York OBA, Hydroboost
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post #3 of 45 Old 04-02-2011, 05:18 PM
CJ7Rubicon
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This upgrade is the best thing I have done to mine so far.

85 CJ7,Clifford equipped 258,TBI,RE4.5,35" Claws,Aussie lockers,8.8 rear.
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post #4 of 45 Old 04-02-2011, 05:19 PM
Jon In Tucson
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You'll love it!

X2 on the swap.
Just finished mine last week, still working out some gremlins, as there always are in these projects. But the idle is much improved, I hardly know it is the same engine. Save some heart ache and lock the distributor down and let the ECM control spark. Not nearly as hard I had imagined. It took longer to remove the old CEC harness and pieces than installing the new. God bless.
Jon In Tucson

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post #5 of 45 Old 04-03-2011, 09:41 AM
n9oig
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I just did this conversion and I'm having starting issues it dumps way too much fuel into it flooding it if I disconnect the injectors to clear it starts then I have to quickly reconnect the injectors to keep it running the it runs fine.

What was done for throttle linkage?

It's the 747 ecu with the 4.3 chips and injectors

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post #6 of 45 Old 04-03-2011, 06:06 PM Thread Starter
bdb86cj
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Maybe try to adjust the fuel pressure on the throttle body, or an external fuel pressure regulator
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post #7 of 45 Old 04-03-2011, 10:09 PM
Trapshooter
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bdb86cj......great stuff. Nice thread. Can't wait to hear when you have it all working on your rig.

'86 CJ7, 258, Carter BBD, Nutter'ed, TeamRush'ed, T-18, Twin Sticked Dana 300, D30 Frt-Pwr Lok L/S-4.10, AMC 20 Rear-Mosers-Detroit Locker-4.10, 2.5 BDS Lift, 1" Body Lift, 33" Wild Country M/Ts, Black Spoke wheels

'45 CJ2A, L134 Go Devil, T-90 Tranny, Warn O/D, T-18 T-Case, Dana 25 Frt, Dana 41 Rear, 531st CJ made

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post #8 of 45 Old 04-04-2011, 07:07 AM
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N9oig- Sounds similar to what my Howell conversion was doing this winter and seems to be better when the temps warmed up. What kind of outside temperatures are you dealing with? Do you have a manifold heater and is it functional? Since mine only does it in cold weather I'm thinking its b/c of lack of an operational manifold heater. Just food for thought....
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post #9 of 45 Old 04-14-2011, 04:07 PM
wrobleskis
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Hello,
I'm about to do this upgrade too. I have all of the sensors and almost finished adjusting the wiring harness. The one thing I was wondering is if you replace the existing coolant temperature sensor with the one for the 4.3, how/where do you connect the temperature guage?

Thanks,

Scott
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post #10 of 45 Old 04-14-2011, 04:22 PM
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Quote:
Originally Posted by wrobleskis View Post
Hello,
I'm about to do this upgrade too. I have all of the sensors and almost finished adjusting the wiring harness. The one thing I was wondering is if you replace the existing coolant temperature sensor with the one for the 4.3, how/where do you connect the temperature guage?

Thanks,

Scott
I don't know if this applies to the junkyard setup, but for the Howell kit they show it going in on the driver's side of the block, towards the back, just below the manifold. There is a hex nut there that you pull and then insert the temp. gauge.
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post #11 of 45 Old 04-14-2011, 04:33 PM
wrobleskis
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Thanks,
That makes sense. A lot of the write ups talk about doing it that way too.
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post #12 of 45 Old 04-14-2011, 04:54 PM
n9oig
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The intake should have 2 sensors in the side already the rear one with 1 wire is the intake temp sensor for the intake heater the one with 2 wires just forward of the carb was for the old computer you can remove it. The temp sensor for the gauge is in the left rear corner of the head

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post #13 of 45 Old 04-14-2011, 05:30 PM
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Quote:
Originally Posted by n9oig View Post
The intake should have 2 sensors in the side already the rear one with 1 wire is the intake temp sensor for the intake heater the one with 2 wires just forward of the carb was for the old computer you can remove it. The temp sensor for the gauge is in the left rear corner of the head
Problem is not all intakes have temperature sensors. Anything older than '82 wasn't computer controlled and the intakes didn't come with a sensor. Also, aftermarket intakes (at least my Clifford) don't have a good port for temperature sensors.
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post #14 of 45 Old 04-14-2011, 05:43 PM
wrobleskis
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I have an 82 which appears to be stock with computer on the inner fender, so hopefully I will be in good shape.

Thanks everyone.
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post #15 of 45 Old 04-14-2011, 07:52 PM
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You can get a thermostat housing for a yj that will come with a temp port also.I have one on mine.

85 CJ7,Clifford equipped 258,TBI,RE4.5,35" Claws,Aussie lockers,8.8 rear.
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