convert to TBI

[Shamil]

Hello guys, i am planning to convert my chevy inline 292 to TBI, I did a lot of search and red some articles, I will be using the v8 305 or 350 TBI system. What parts I need to take off of the donor’s engine with TBI, wiring harness, the computer and fuel pump. Do I need sensors, which? Change the distributor?

[Shamil]

anyone... please

[tkeduk8r]

im doing the same thing..... heres what I found... Its best to find an 87 TBI system and grab EVERYTHING from the donor truck... the reason the 87 is desirable is they added the TBI as an add-on preparing fro 88's new body style so the harness/computer etc has its own seperate harness. I was planning on using an aftermarket 4bbl intake and making (i am a metals teacher) an adapter for the throtle body. you will also need an electric fuel pump unless you are going to retrofit a burb or blazer tank under the rear of the bed. I am planning on doing this to a 63 pu so I will have to add a return line from the TBI back to the tank... you should just be able to tie into your existing one. My only question yet is concerning the distributor and if there is a plug and play dist that can be used... not sure if the regular old HEI will work. Hopefully someone can answer that.... Hope that helps..
--Mike

[SCOTI]

Originally Posted by tkeduk8r

im doing the same thing..... heres what I found... Its best to find an 87 TBI system and grab EVERYTHING from the donor truck... the reason the 87 is desirable is they added the TBI as an add-on preparing fro 88's new body style so the harness/computer etc has its own seperate harness. I was planning on using an aftermarket 4bbl intake and making (i am a metals teacher) an adapter for the throtle body. you will also need an electric fuel pump unless you are going to retrofit a burb or blazer tank under the rear of the bed. I am planning on doing this to a 63 pu so I will have to add a return line from the TBI back to the tank... you should just be able to tie into your existing one. My only question yet is concerning the distributor and if there is a plug and play dist that can be used... not sure if the regular old HEI will work. Hopefully someone can answer that.... Hope that helps..
--Mike

GM's TBI set-up has a specific distributor so you can't use the older HEI units.

[C-10 simplex]

i would call these guys:

http://howellefi.com/


Complete kit for inline 6 for $1300 USD.

[rfmaster]

Originally Posted by tkeduk8r

im doing the same thing..... heres what I found... Its best to find an 87 TBI system and grab EVERYTHING from the donor truck... the reason the 87 is desirable is they added the TBI as an add-on preparing fro 88's new body style so the harness/computer etc has its own seperate harness. I was planning on using an aftermarket 4bbl intake and making (i am a metals teacher) an adapter for the throtle body. you will also need an electric fuel pump unless you are going to retrofit a burb or blazer tank under the rear of the bed. I am planning on doing this to a 63 pu so I will have to add a return line from the TBI back to the tank... you should just be able to tie into your existing one. My only question yet is concerning the distributor and if there is a plug and play dist that can be used... not sure if the regular old HEI will work. Hopefully someone can answer that.... Hope that helps..
--Mike

OLD 6 cylinder HEI distributor will have to be modified. Modification is rather simple - remove and lock out vacuum advance and replace 4 pin ICM with a 7 pin module - part number AC-Delco (D1948, D1952, D1956, D1963A, D1968, D1973) GM (1988500, 1977907, 1978617, 1987714, 1976908) and many others. Over the years I found that late 80's front wheel drive Cadies equipped with 4.1/4.5L TBI engines use large style HEI hat distributor which can be the source of ICM and wire harness.

You can use 1227747 ECM from V6 application (4.3L) common across multiple platforms C/K trucks, minivans, etc. The 292 is only slightly larger than 4.3L V6 - the 45lb-hr injectors used in V6 application will work just fine. To get things going stock V6 calibration will be enough to fire the 292, but expect to spend time tuning ECM parameters to get best performance and economy. Check the TBI conversion thread. Hence, I see EPROM tuning in your future.

//RF

[makman1297]

It depends on if you plan on running stock or aftermarket chip/computer. If you get a custom chip you can have the EGR and stuff turned off, which you would probably need since your I6 is different.

[D13]

Search over in the engine area, at least 4 threads on this topic.

[jchav62]

Try 'Affordable Fuel Injection'...

http://www.affordable-fuel-injection.com/

[D13]

$255 on evilflay buys a new billit 7 pin L6 distributor
or mod as above
or find the rare California ESC 7-pin distributor

[camaney]

how do you wire the 4 to 7 pin? do you have pics or diagram or is there a wire harness somewhere that I can buy? thanks

[rfmaster]

Originally Posted by camaney

how do you wire the 4 to 7 pin? do you have pics or diagram or is there a wire harness somewhere that I can buy? thanks

You'll need to go to a local JY and find either 4.1L or 4.5L cady with TBI. These late 80's front wheel drive cadies used full size HEI distributors. Pull the HEI hat off remove all the guts and make sure to grab everything. Cut pig tale from the harness - this way you'll have a mated connector pair. The wiring inside is very simple.



Depending on your HEI distributor vintage you may or may not have to replace reluctor coil - just swap in ignition module and harness in and see if it runs ok with TBI.


//RF