Can anyone school me on 2F TBI

What ECM should I use.

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scott84

scott84

Joined
Mar 28, 2009
Threads
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Location
Gillette, Wyoming
I have been researching this for quiet some time but I feel like I dont have enough of a grasp on this to pull the triger on buying the parts yet. I realize that this is pretty straight forword get a wiring harness, ecu, TB, and sensors. But installing and tuning these might be a little over my head! :o I would like to be able to do this for under $1000. What parts/sensors do I actualy need. I have access to a $3000 dollor scan tool and I have all the Basic tools a back yard mechanic should have. Also this my daily driver and I will most likely be doing this in the early spring but I want to start acumulating parts sooner than later.:wrench:

Running totals
Tbi Downey adaptor-$80
Throtle body Wiring Harness ECM Sensors-$150
 
Last edited:
A friend just finished installing this same thing. One revelation from the data logging was that the 4.3 Chevy injectors were not up to the task (within acceptable duty cycle parameters) at the standard pressure. So you should plan on either raising the fuel pressure or going to the injectors from a 350. The throttle body itself is the same, the injectors are different. In addition you need the spark control, the ignition module from the distributor (Your stock pickup coil can power it. Grounding it properly is critical, ground the mounting screws, not the body) a knock sensor, the MAP sensor, a coolant temp sensor, a wire harness and the computer. No mater what anybody says, the mapping for the 4.3 will not run a 2F properly. It will run, but not well. Try www.tbichips.com for links and info. He can burn you a chip too. Or you can snag the whole motor and be done with it.
 
There are companys out there that will give you everything you need, complete with new harness Throttle body, and computer with the correct chip for a $1000 dollars shipped to your house, with their tech support...why would you cobble a system together and cross your fingers when you could install something new. ?? Just asking
 
I would just rather do it for less than more.... im just cheap:grinpimp:

For those that have done this what would be the advantages and disavantages of the megasquirt over the gm computer?
 
Itsadryheat!!! said:
There are companys out there that will give you everything you need, complete with new harness Throttle body, and computer with the correct chip for a $1000 dollars shipped to your house, with their tech support...why would you cobble a system together and cross your fingers when you could install something new. ?? Just asking
Click to expand...

Those systems are never quite right and they will ALWAYS require a custom chip unless you would be content with the rig running at 85% of its potential after your investment. GM made a supurbly simple and effective TBI system for which there are mountains of parts, knowlege and support. Why would you not do that especially when the parts are quite literally everywhere?
 
I agree with lehiguy, which is good cause he has been one of my tech support guys on my TBI. Tom Quinn has a good page in the tech section with pictures on how to convert the 2F dizzy to work with the GM stuff. Also in the tech section is a write up done by olympiaFJ60 with good info. When I got started I seriously considered a kit from Affordable Fuel Injection but the $1400 dollar price tag held me back. When you look at the whole project it might seem like a daunting task. You just need to break it down into sections and plan on spending a decent amount of time (working and scratching your head:confused:) The only real fab work with a welder I had was a throttle cable bracket (sourced from a 91 GMC Sonoma) and an O2 sensor bung. You will also need to fab a fuel pump block off plate. I used .25" flat stock just because it was laying around. Tap threads into in for your knock sensor .25"x20 Npt (shooting from the hip I would have to check my notes) I think. Make sure to get a haynes or chilton's manual for the donor vehicle, the wiring diagrams are a must.
:cheers:
 
Oh Yeah, TBIchips.com should have my mapping on file for your chip but I would still do your own datalog that way your chip is custom to your rig
 
Mega Squirt is cool, but if you plan on being out in the middle of nowhere on a camping trip, an EFI with the ability to run on "limp" and availability of ECU's in the junkyard or parts house is comforting. MS is a homebuilt PC board. Very tuneable and an interesting thing to tinker with. I would run it on a hotrod not my trail rig. Just my $0.02
 
Thanks for the info I've studied Tom Quinns Website and olympiaFJ60's quite a few times. I just bought a Downey tbi adaptor off ebay and it comes with instructions! The guy, I've read that he was former Downey employe :grinpimp:
Another quesition I've had is the return line on a FJ60 big enough or do you have to plumb one back.

Here is the candidate for the swap a 1984 fj60 that has been in my family since new. Crashed rebuilt and painted by me mecanicaly sound except I got 6.5 mpg this last tank but its been in 4wd most of the time and has been let warm up 10-20 min every morning I've drove it.:steer:
1291679273997.webp
1291679260448.webp
 
return line

The return line is big enough. I think its a 3/8 or a 5/16 line but it seems like the same as the GM return is. When you get your Throttle Body, (providing its from a junk yard) snag at least a foot or so of the fuel feed and return line. You will be able to cut it off wherever it works on your cruiser then flare the ends so you can tie the rubber fuel lines on to them. I wasn't able to find anything that would thread into the throttle body itself. You can either double clamp the rubber fuel line or use Fuel Injection hose clamps, I'm told they hold better, won't losen up and won't damage the hose. If I can find some daylight and spare time I'll see if I can post some pics to help give you some ideas.
 
Thanks Pics would be great and while your at it can you post up some pictures of the throtle linkages. Thanks again
 
I just swapped my stock 4.3 injectors to the 5.7 ones on saturday. There is a noticeable power gain but I need to get my chip re-burned before I can tell the final results. I will try to snap some pics tomorrow, my camera doesn't do so hot at night.
P.S. Those 5.7 injectors slipped right in to the throttle body from the 4.3, so you could get one from either motor but if the 5.7 injectors are the answer for the thirsty 2F you could save some hassle by scoring a whole throttle body from the5.7
 
I think it would run but not as well as it could. The computer in stock form will be looking for imputs the 2f can't give so they need to be deleted from the program. I assume since you're in Wyoming smog is not an issue. I've never delt with a TBI/2f I just have some basic knowlege of the stuff. I would keep searching your on the right path. A stand alone harness sounds like it will be your best bet with EGR and VATS deleted from the system. That is something a tuner needs to do. If you buy a system from Affordable EFI or the like they will have tech support included for your money
 
The wire harnesses from the full size trucks is easier to work with and it has the same connectors as the 4.3. You want the spark control, computer, ingnition module (in the distributor) and knock sensor from a 4.3, a throttle body and harness from a full size truck with a 350. (Get the oil pressure switch from one or the other if you are going to use the stock harness.) That will get you the 55lb/hr injectors and and a harness with minimal extra junk to remove plus extra length to reach where you need it to. A custom chip is a must. This may sound daunting, but it really is fairly easy. I'm glad I used the stock harness because it helped me understand the overall system as I figured out each circuit and removed the ones I didn't need.
 
Thanks again guys this is a lot of useful info another question that I had was how does the a/c idle up work with the TBI!
 
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