Engine Swap Everything about swapping an engine into your Third Gen.....be it V6, V8, LTX/LSX, crate engine, etc. Pictures, questions, answers, and work logs.

Standard O.P.

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Old

Dec 9, 2010 | 06:46 PM

#1

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Standard O.P.

When you swap a motor into another later model vehicle is it common to swap the harness and computer with it?

Old

Dec 9, 2010 | 07:34 PM

#2

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From: Mercedes Norte, Heredia, Costa Rica

Car: 1984 Z28 Hardtop

Engine: 383 Carb

Transmission: 4L60

Axle/Gears: 3.54 Dana 44

Re: Standard O.P.

It depends what the original engine was, what the new one is, and how much you're swapping.

Old

Dec 10, 2010 | 02:41 PM

#3

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Re: Standard O.P.

I am pulling an 83 CFI engine and tranny together and am Putting it into a 92 F body

Old

Dec 10, 2010 | 04:48 PM

#4

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Joined: Jan 2000

Posts: 20,981

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From: Mercedes Norte, Heredia, Costa Rica

Car: 1984 Z28 Hardtop

Engine: 383 Carb

Transmission: 4L60

Axle/Gears: 3.54 Dana 44

Re: Standard O.P.

How much of it are you swapping? Just the short block? Long block? Intake too?

Old

Dec 10, 2010 | 05:12 PM

#5

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Re: Standard O.P.

Im swapping all of it engine and tranny complete and dropping it into the 92 body.

Old

Dec 10, 2010 | 05:17 PM

#6

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From: Mercedes Norte, Heredia, Costa Rica

Car: 1984 Z28 Hardtop

Engine: 383 Carb

Transmission: 4L60

Axle/Gears: 3.54 Dana 44

Re: Standard O.P.

If you're swapping the CF induction system too, then absolutely you'll need the harness and ECM to make it work.

Old

Dec 10, 2010 | 05:20 PM

#7

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Re: Standard O.P.

yes I thought so. So ive begun pulling the harnesses. The c100 pinouts are of corse different any idea where to get an 83 CFI c100 c207 pinout diagram? Thanks for responding by the way.

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Old

Dec 10, 2010 | 05:35 PM

#8

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Joined: Jan 2000

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From: Mercedes Norte, Heredia, Costa Rica

Car: 1984 Z28 Hardtop

Engine: 383 Carb

Transmission: 4L60

Axle/Gears: 3.54 Dana 44

Re: Standard O.P.

Check an 83 factory service manual.

Old

Dec 10, 2010 | 05:49 PM

#9

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Re: Standard O.P.

ok will do can I just swap the prom itself or do I need to swap the whole ECM?

Old

Dec 10, 2010 | 06:05 PM

#10

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Posts: 20,981

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From: Mercedes Norte, Heredia, Costa Rica

Car: 1984 Z28 Hardtop

Engine: 383 Carb

Transmission: 4L60

Axle/Gears: 3.54 Dana 44

Re: Standard O.P.

The whole thing. The ECMs are completely different.

Old

Dec 10, 2010 | 08:28 PM

#11

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Re: Standard O.P.

Yep thats what I thought now I am planning to repin the 92 c100 to accept the 83 harness and then on down the line to the ECM. Am I missing any thing?

Old

Dec 10, 2010 | 08:30 PM

#12

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From: Mercedes Norte, Heredia, Costa Rica

Car: 1984 Z28 Hardtop

Engine: 383 Carb

Transmission: 4L60

Axle/Gears: 3.54 Dana 44

Re: Standard O.P.

Why repin when you could replace the harness on both sides?

Old

Dec 10, 2010 | 08:38 PM

#13

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From: Cincinnati, Ohio

Car: '89 GTA

Engine: 5.7L LS1

Transmission: 4L60E

Axle/Gears: 9 bolt 3.27

Re: Standard O.P.

Quote:

Originally Posted by Apeiron

Why repin when you could replace the harness on both sides?

Indeed you could just replace the dash harness as well, but I believe you would have to also swap the cluster and mechanical speedo stuff?

Old

Dec 10, 2010 | 08:40 PM

#14

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Re: Standard O.P.

Quote:

Originally Posted by Apeiron

Why repin when you could replace the harness on both sides?

Both sides? you mean all the wiring or what.

Old

Dec 10, 2010 | 08:42 PM

#15

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Re: Standard O.P.

Quote:

Originally Posted by White'89

Indeed you could just replace the dash harness as well, but I believe you would have to also swap the cluster and mechanical speedo stuff?

Yeah I would think that would be much more intensive, Right?

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