Engine Swap Chevy 4.3L v6 – Need TBI info

[John]

Greetings Everyone, first post here.

I’m swapping a chevy 4.3L v6 from an 86 el camino. The donor vehicle is a 94 chevy 1500 with a 4.3L v6 vortec. I was wondering if I needed to completely swap the tbi harness and ecu. Or if I can just swap the connector for the throttle position sensor and the EGR solenoid. Everything I’ve read the two systems are nearly identical with maybe a few tweeks to the coding for the 94 but the voltages and sensors should read out the same. I know the throttle position sensor has a different connector but I think it’s more for ease of assembly. The older map sensor and throttle position sensor were using the same connector, slightly confusing. Other then that I noticed the evap can might be different between the two. The 94 doesn’t have a vacuum boost line. But since the lines are all cracked and leaking I don’t think it’ll really notice the difference.

Thank you in advance for any help and advice.

Topic

[college man]

I would swap everything this way all connectors,sensors and ecu will work correctly.
Plug and play.

[Douglas Haynes]

Is the motor in the truck a TBI or CPI motor?

If it is TBI everything should work if not nothing will work.

If it is a TBI/TBI swap I would use the sensor with the correct plug for your harness instead of cutting up the harness but other than that it should work.

[John]

It’s a tbi to tbi swap. For some reason the wiring harness matches from 87 to 93 then changes for the last 2 years. I was planning to swap out sensors but noticed the throttle position sensor was completely changed, both bolt in pattern and wiring connector. The other thing I’ve been researching is if the vortec motors have a different vacuum that might throw off the map sensor to my ecu.

[Douglas Haynes]

Can you just swap the older throttle body on?

If the sensor range is the same it should work fine.

[Allan]

hello 🙂 both tps work the same.. signal around 0.5 v at closed trottle and around 4.5 v WOT..

[Author]

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