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Old 05-18-2010, 04:16 PM   #1 (permalink)
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Electronic vs vacuum/mechanical timing advance


I have a 1991 Metro with a vacuum advance distributor. I also have a junker 1992 Metro with an electronic advance distributor. Based on the assumption the elctronic control is better than the vacuum control, I would like to use the 1992 distributor. After looking at the wiring diagrams, it appears that I would have to swap out the ECU if I were to use the electronic distributor in the 1991 Metro.

Is this correct?

Are there any issues with swapping a 1992 ECU with a 1991 car? Will I have to swap any other components in order to make the ECU happy? Will I have to move wires around on the multiwire connectors?

- Peter

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Old 05-19-2010, 05:51 AM   #2 (permalink)
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You'll have to make a bunch of changes to the wiring. The '92 ECU won't plug into the '91 wiring harness.
Driving a 1991 Honda Civic Wagon and slowly building a 1994 Geo Metro XFi.
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Old 07-02-2010, 01:18 AM   #3 (permalink)
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Will it be that hard to do? I was thinking of swapping the distributor too but if it is too painstaking then I might change my mind instead.

Last edited by mikeross; 07-06-2010 at 01:49 AM..
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Old 07-09-2010, 01:23 PM   #4 (permalink)
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My experience with the Metro is very limited, but I've lots with some other cars that also went from Mech -> Elec on the distributor. And, the ones I know about, the swap would be very very hard to do. 99% of them do indeed require you to swap the ECU over, and most of these swaps involved a lot more than just plug-n-play. I can't think of one where all of the ECU Pins even matched. Granted, the Metro might not be as complex as others, but I think you'll be doing way more work than it's really worth. The gains will most likely not justify the work.

Not the answer your looking for I'm sure, sorry I couldn't offer more help.

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