i have a 61 CJ5 that has the stock motor with a t-18 behind that. not good enough......i am goin to swap a TBI 4.3 in
Objective #1
i am goin to buy a wrecked full S10 pickup or blazer that has a 5 speed, TBI or Vortec. and use the 5speed bellhousing and clutch and just adapt to my T18

being that i am goin to adapt to my T18 from the stock five speed, will they're be any electrical prblems? (sensors and ect.)
any advise on this swap, or warnings i should be aware of??

*warning* you will soon wish you had chossen a v-8.



i swaped a 4.3 and wish i had just done a 350.

Originally posted by camo
*warning* you will soon wish you had chossen a v-8.



i swaped a 4.3 and wish i had just done a 350.

but you got NOS so its all good:flipoff2:

Originally posted by Brad


but you got NOS so its all good:flipoff2:

i had to compensate somehow. :D

Originally posted by camo


i had to compensate somehow. :D
bet the nos woulda fixed your tranny and gotten you up the hill despite your toyota axle at carnage:D

or at least made me laugh :D

As far as the TBI computer stuff goes, I can't see any reason you'd have trouble swapping the 5 spd for the T18. Shouldn't make any difference, you'll just have to use an aftermarket VSS that goes inline on the speedo cable (~$85).

If you're going V6 though, I would seriously consider the 4.3 Vortec; more work to install but I think the difference would be worth it. From what I understand, the '92-early '95 motors/pluters/harnesses are easier to work with when swapping.

Pete

a 4.3 tbi swap is a snap. i highly recomend getting a painless wiring harness. the latter model mpi vortect put out more power but are more complicated.


fyi. with a cam change and a new manifold you can get nearly the same power as a newer mpi. with simplicity of the tbi.

if you do the swamp and need the vss let me know cause i have a new one that i didn't use. ( you don't need it on a trail rig )


the 4.3 is a good motor and makes good power for rock crawlin but i think it comes up short for muddin and dunes. also my buddy has one in his street driven cj7 with a sm420 and it suffers on the street.

If you want to save a few bucks, you can make the factory TBI wiring harness and computer work without having to buy the painless stuff. Just undo the harness and find the ~6 magic power and ground wires which are needed for the computer to work and everything will be fine.

Like camo said, for a trail rig or just an occassional driver, the VSS is not needed. This is mainly used for EGR operation. I have swapped in 3 TBI 350's into other trucks and each one still runs great. The only code that they will throw is the missing VSS and that only comes up after cruising down the road for a while. On the trail, no codes :)

BTW, when getting a fuel pump for this setup, either get a factory in tank unit or get the GOOD aftermarket in line one. It costs ~$110 instead of ~$30 but has not let any of my trucks down :)

what aftermarket pump are you using on your swaps ?

- jack

i am currently using one from turbo city. it is terrible. it is not self priming and when ever i get on an angle with less than 1/2 a tank of fuel i suck air and it is an ordeal. i am currently looking for a SELF PRIMMING 15 PSI PUMP.

Originally posted by camo
i am currently using one from turbo city. it is terrible. it is not self priming and when ever i get on an angle with less than 1/2 a tank of fuel i suck air and it is an ordeal. i am currently looking for a SELF PRIMMING 15 PSI PUMP.

Carter makes a fuel pump specifically for TBI swaps in vehicles that originally came with a carb. It's frame rail mounted and looks exactly like the pump used by the Holley projection system. Cost me about $160 CAN (so cheap in that monopoly money you guys use). It's in the back of the Carter catalog.

I won't say %100 for sure that it self primes but my system did fire right up dry when I swapped my TBI 350 in.

I agree that if going TBI, the factory harnesses are not too bad to work with, I did mine that way and also helped my brother out on his, both our harnesses were out of '87-'89 V series, but it shouldn't matter too much what its out of.

I used a factory tank out of a FI truck, with the baffles for the fuel pump. However, I have helped a couple guys (including my brother) add in-tank pumps to carb tanks, and they seem to work quite well. Its a bit of a pain making the pump/sender assy fit through the smaller openings in the older style tanks, but it can be done. The TBI in-tank pumps also seem to work well for the Holley Systems, at least the older ProJections (don't have any experience w/the newer setups).

As for external pumps, I have seen some successful setups using 2 pumps inline; the first one being a self priming one intended for a carb application, feeding a FI pump.

Pete

I hate to say it, but the fuel pump that i am talking about is from Autozone :) If you go in ask for the in frame replacement pumps and there is a cheap one and then there is the expensive one. The cheap ones last until you get out of the parking lot :flipoff2: The expensive one is lifetime warrantied and I think that it is only listed in the catalog. (NOT in there infamous computer) I have the part number around here somewhere if you really want it.

I have never had any problems with mine not priming. It always goes. If I have run the system dry or on initial startup, I just cycle the key twice and listen for the magic blooop coming from the TBI and then hit the key :)

Mnstr_fx about the computer and wiring harness, I have a 1999 that was bolted up the a 4L60E (which i'd like to sell). I'm putting on a SM 420 and i'd like to use the original computer and wiring harness but loose all the stupid sensors it has. All i realy want to run is the TBI. If i run just the 6 wires you were talking about to the TBI it should work? I called Painless, Howell, and Centech but that was going to cost me between $700- $1000 :eek: And id like to avoid that and use what i have (just modified)

Walbro external pump from Howell has worked fine for me for
11 years. Bought another one for the new engine and will
keep the old one as spare.

If using the 1227747 ECM you need to stick to the older...
maybe pre 1993 harnesses. The plugs changed on the later model ECMs.

Jay

Brad,

The 99' engine is a Vortec engine. This is a good thing in that it has LOTS of power and some really good heads on it. The bad thing is that it does not run the same as the good old TBI. In fact the TBI manifold is not even a direct replacement for the Vortec intake either. You are going to use the stock computer and wiring harness to get it running or change over to a Painless / Howell etc... setup.

The other thing which would make this a little more of a headache is that it is an OBD II engine. Read that as twice as much BS to make it work properly. I have lots of experience with the TBI, TPI, and LT1 OBDI setups. The OBD II setups I have only read about, and it gets messy pretty quick :flipoff2: :eek:

Originally posted by camo
... i am currently looking for a SELF PRIMMING 15 PSI PUMP.

AC Delco used to make a self-priming motor-driven pump that made most others look silly. They're about 7" long by 5" wide and 3" thick; have a motor on one end about the size of a heater fan motor, and a rebuildable pump unit. The axis of the electric motor was actually perpendicular to the pump body and had a gear drive. These would do 15 psi and 150 gph; very popular in motorsports because they were incredibly reliable. They quit making them back in the 80's and the last two I knew of went to the junkyard on the rigs they were attached to. :mad: