JUNKYARD TBI UPGRADE
So after a few days of driving the heep around, I'm fed up with adjusting the timing/carburetor. It seems like when she's cold, she sputters to lie and runs really rough. After she warms up, you can smell gas and she'll crackle and pop when down shifting. I'll advance the timing and it'll run better but still smell like gas and "load up". I'll thin it out (I have the Carter 2bbl by the way, no choke hooked up) and then it'll want to die at stop lights and won't want to start. I've always been adjusting it back and forth since I've owned it, and I've gotten it close, but this weekend I just had enough of it. So here I start the GM TBI swap in hopes that the computer will take control and it'll run smoother. Another reason I'm doing this swap is for the dependability of fuel injection, not worrying about loading up while putting around, off camber situations, MPG, and TB are pretty much carburetors and don't get all crazy with an injector per cylinder etc, etc, etc.
So parts and cost:
4.3L Throttle body
4.3L ECM ( 1227747 or 1228746)
ECM plastic case (if you care about making it look factory or keeping it clean. It provides an excellent mounting case and provides extra protection) (Found in Astro vans, passenger side)(Leave ECM in case when purchasing to save a few denaro)
4.3L wiring harness from fuse block to ECM from donor car (pre 94 S10, gm van, blazer etc) (if you leave the sensors, plugs, relays, and anything else still connected, you can get away with being charged just for the wiring harness. I think for everything(ECM,TB,harness, sensors) I paid $70 from a pick and pull). (Don't get the GM air cleaner if you want to do a cold air intake. Refer to parts list for better option)
GM coolant temp sensor ($5 pick and pull)
O2 sensor ($5 pick and pull)
TB fuel lines from TB (off donor)
Throttle positioning sensor (TPS)
Throttle Body Plate (make for easiest option, 6"x 6" 3/4" aluminum off ebay, $18)
Electric fuel pump ($26 shipped, lifetime warranty off ebay. E2000 model)
Dorman 800-119 3/8 quick disconnect (http://www.summitracing.com/parts/rnb-800-119
7 or 8 pin ignition module (will update when I get mine) ( I used 7 )
Knock sensor (from donor, also optional)
Clear fuel filter (glass/aluminum) $10 Pep boys
Generic fuel filter, metal $5 pep boys
10' 3/8" fuel line $20
Vacuum tube caps, $2.50 pep boys
I converted to all weather pack connectors, $30 off ebay
Save coil holder from old ignition coil, used to hold fuel pump!!!!
Cadillac air cleaner/plenum thingy off late 90's vehicle (pic to come)
!!!!!!!!Again, Try and get as much off the donor as possible, leave everything connected and if you can, connect parts from other donor cars, and go on a half off day and you'll be able to get everything for super cheap!!!!!!!!!
Website guide list for part info, wiring diagrams, and additional options (depending on distributor configuration and personal preferences. This write up will be on the rout I'm going and what I've previously discussed in the thread).
This is all I could remember for now. I will update anything I forget as I go. I am also going to do the GM throttle body mod which will allow the TB to breath better. Since I'm waiting on some parts I didn't get out of the pick and pull, I'll be doing this first; Idle hands and all..........