Tbi conversion help

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

yevgenievich

Full Access Member
Joined
Mar 1, 2014
Posts
4,781
Reaction score
3,300
Location
Texas
First Name
Viktor
Truck Year
sad
Truck Model
very sad
Engine Size
less sad
I have a wiring harness for the 747 as well if you want to try that route. Will pm
 

Tonyorlo

Member
Joined
Nov 11, 2016
Posts
35
Reaction score
0
Location
Glen dale
First Name
Tony
Truck Year
1979
Truck Model
K20
Engine Size
350
I like that much better than trying to mess with burning proms and sourcing the correct ecu. Should the ignition and everything else plug into the current engines components?
 

1987 GMC Jimmy

Automobile Hoarder
Joined
Jan 23, 2016
Posts
5,848
Reaction score
2,387
Location
Mississippi
First Name
Jesse
Truck Year
1987
Truck Model
V1500 Jimmy
Engine Size
350
I like that much better than trying to mess with burning proms and sourcing the correct ecu. Should the ignition and everything else plug into the current engines components?

I like that idea better, too. Everything's gonna be the same, I think. I doubt you'd have the round style TPS sensor so that should be okay. The 7747 is a much better option. If the ESC ever fails, you don't have to replace the whole computer, it's easy to tune, and there's a lot of support out there. Plus, if you want, you can make your own ALDL to USB cable and do system checks, data logging, and tuning. I hope it works out. Here's a great thread by @Georgeb. Inspired me to do the same thing. http://www.gmsquarebody.com/forum/showthread.php?t=13194
 
Last edited:

Tonyorlo

Member
Joined
Nov 11, 2016
Posts
35
Reaction score
0
Location
Glen dale
First Name
Tony
Truck Year
1979
Truck Model
K20
Engine Size
350
Viktor is going to hook me up with a harness and ecu. I'll check everything out on the stand before I drop the engine in. The engine has sat for 10+ years in a garage. I will pull the valve covers and oil pan just to check it out. I considered buying a throttle body, viktor recommended I freshen the one I have up so I will definetly do that.

I really like the idea of being able to data log and make adjustments myself too. I would like to maybe throw a set of headers on the engine someday. Being that I won't have catalytic converters will that throw a code?
 

1987 GMC Jimmy

Automobile Hoarder
Joined
Jan 23, 2016
Posts
5,848
Reaction score
2,387
Location
Mississippi
First Name
Jesse
Truck Year
1987
Truck Model
V1500 Jimmy
Engine Size
350
Viktor is going to hook me up with a harness and ecu. I'll check everything out on the stand before I drop the engine in. The engine has sat for 10+ years in a garage. I will pull the valve covers and oil pan just to check it out. I considered buying a throttle body, viktor recommended I freshen the one I have up so I will definetly do that.

I really like the idea of being able to data log and make adjustments myself too. I would like to maybe throw a set of headers on the engine someday. Being that I won't have catalytic converters will that throw a code?

Nope. The O2 sensor is pre-cat.
 

yevgenievich

Full Access Member
Joined
Mar 1, 2014
Posts
4,781
Reaction score
3,300
Location
Texas
First Name
Viktor
Truck Year
sad
Truck Model
very sad
Engine Size
less sad
Viktor is going to hook me up with a harness and ecu. I'll check everything out on the stand before I drop the engine in. The engine has sat for 10+ years in a garage. I will pull the valve covers and oil pan just to check it out. I considered buying a throttle body, viktor recommended I freshen the one I have up so I will definetly do that.

I really like the idea of being able to data log and make adjustments myself too. I would like to maybe throw a set of headers on the engine someday. Being that I won't have catalytic converters will that throw a code?

Sitting for so long, also test the injectors. Soak them for some time, then can comnect one pin to 12 v and tap ground wire on the other pin. Should hear a click. But do not hold power applied, just tap very quickly. If no click, tap on inject with a screwdriver handle or the like and try again.
 

Tonyorlo

Member
Joined
Nov 11, 2016
Posts
35
Reaction score
0
Location
Glen dale
First Name
Tony
Truck Year
1979
Truck Model
K20
Engine Size
350
Ok, I haven't priced out injectors, are they expensive? I'm going to use a inline fuel pump for now, when I switch to in tank pumps is there a factory switch option for the dual tanks?
 

yevgenievich

Full Access Member
Joined
Mar 1, 2014
Posts
4,781
Reaction score
3,300
Location
Texas
First Name
Viktor
Truck Year
sad
Truck Model
very sad
Engine Size
less sad
All parts from 87 trucks with dual tanks will swap over. Injector prices vary, yours might be good after cleaning.(new/rebuilt $80-$150 range) you might consider getting one tank replaced with 87 one and run intank fuel pump from the start. Then later get the other one switched over.
 

1987 GMC Jimmy

Automobile Hoarder
Joined
Jan 23, 2016
Posts
5,848
Reaction score
2,387
Location
Mississippi
First Name
Jesse
Truck Year
1987
Truck Model
V1500 Jimmy
Engine Size
350
If you want to do like an ultrasonic type cleaning, WitchHunter performance does that and flow tests them for $22 a pop. It's a gamble, but it'd be a little less than half of what you'd pay for new ones. I've never used them, but I know folks on here have.
 

Tonyorlo

Member
Joined
Nov 11, 2016
Posts
35
Reaction score
0
Location
Glen dale
First Name
Tony
Truck Year
1979
Truck Model
K20
Engine Size
350
I think for now I will take the gamble with the injector. That is above option rather than buying a new one if I honk it's just clogged.

Can I drop a later sending unit in the early tank?
 

yevgenievich

Full Access Member
Joined
Mar 1, 2014
Posts
4,781
Reaction score
3,300
Location
Texas
First Name
Viktor
Truck Year
sad
Truck Model
very sad
Engine Size
less sad
I think for now I will take the gamble with the injector. That is above option rather than buying a new one if I honk it's just clogged.

Can I drop a later sending unit in the early tank?

Better to swap tanks because efi tank has a baffle, while ofiginal carb tank does not.
 

Tonyorlo

Member
Joined
Nov 11, 2016
Posts
35
Reaction score
0
Location
Glen dale
First Name
Tony
Truck Year
1979
Truck Model
K20
Engine Size
350
Ok. Well I really have no use for 2 tanks, so I will most likely eliminate a tank when I do this. A quick glance at rockauto looks like I will have about $120-$150 in a new tank, sending unit, and pump.
 

4WDKC

Full Access Member
Joined
Jan 27, 2016
Posts
2,366
Reaction score
1,090
Location
Southern Florida
First Name
Kacy
Truck Year
1987
Truck Model
V10
Engine Size
350
Ok. Well I really have no use for 2 tanks, so I will most likely eliminate a tank when I do this. A quick glance at rockauto looks like I will have about $120-$150 in a new tank, sending unit, and pump.

I would recommend you look around for a pump that can withstand higher PSI, I put a stock replacement in mine and now to increase the HP I need higher pressure pump.
 

Tonyorlo

Member
Joined
Nov 11, 2016
Posts
35
Reaction score
0
Location
Glen dale
First Name
Tony
Truck Year
1979
Truck Model
K20
Engine Size
350
Will you need to run a regulator with a aftermarket pump?
 

Latest posts

Forum statistics

Threads
41,857
Posts
903,628
Members
33,370
Latest member
mitchell1128
Top