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There are different Igniter Part Numbers for the different year Celica Supra Igniters. The main differences are the cable connections and the bottom mounting plate.
The core electronic module is the same.
This is a comparison between the 89620-22360 from the 08/1984-07/1988 MX7X Cressida and the 89620-14361 from the 08/1983 - 11/1985 Supra. I strongly suspect that the same is true for the 89620-14430 01/86-04/93 Supra, 89620-14430 08/88-06/92 Supra, and the 89620-22480 08/88-07/90 MX8x Cressida, 7MGE non-turbo Igniters but I have not seen the internals of these so I could be wrong.
The normal way of changing these Igniters is to change the base over and then cut the Cressida Igniter plugs off of the wiring harness and to graft it onto the Supra harness.
This certainly works, but is not the neatest approach.
The cable connectors were attached with crimps and covered in heat shrink tubing
The alternate and cleaner approach is to change the entire wiring harness in the Igniter from the Supra and attach it to the Cressida Igniter.
The result is a cleaner conversion. In fact one can remove the electronic module from the Cressida upper housing, exchange the harness and install the module and harness into the existing Supra upper housing. The result looks like the stock Igniter. When you change the electronic module you can clean the rear of the module of the old heat sink compound and apply new.
Remove the 4 Phillips head screws. These are extremely difficult to remove. Apply a LOT of downward pressure to prevent the screwdriver from damaging the screw head.
Once the base is removed you can see the electronic module. It is attached with the 3 Phillips head screws. Once removed the module lifts out. The heat sink compound is underneath and ensures good thermal contact with the upper Igniter housing.
89620-22360 Cressida vs 89620-14361 Supra Igniter Wiring Comparison - Detail
One can see the module connectors are identical. The labels embossed on the black potting material are the same. The wire colours on the two modules are the same.
The wire connector can be removed from the module with adequate heat from a soldering iron. Once hot the connector can be lifted off.
One should not apply too much heat for too long or you risk damaging the potting material and the electronic module.
I would like to see a 7MGE Igniter. I believe that the connections are identical and can be modified in the same way.
Dale
The core electronic module is the same.
This is a comparison between the 89620-22360 from the 08/1984-07/1988 MX7X Cressida and the 89620-14361 from the 08/1983 - 11/1985 Supra. I strongly suspect that the same is true for the 89620-14430 01/86-04/93 Supra, 89620-14430 08/88-06/92 Supra, and the 89620-22480 08/88-07/90 MX8x Cressida, 7MGE non-turbo Igniters but I have not seen the internals of these so I could be wrong.
The normal way of changing these Igniters is to change the base over and then cut the Cressida Igniter plugs off of the wiring harness and to graft it onto the Supra harness.
This certainly works, but is not the neatest approach.
The cable connectors were attached with crimps and covered in heat shrink tubing
The alternate and cleaner approach is to change the entire wiring harness in the Igniter from the Supra and attach it to the Cressida Igniter.
The result is a cleaner conversion. In fact one can remove the electronic module from the Cressida upper housing, exchange the harness and install the module and harness into the existing Supra upper housing. The result looks like the stock Igniter. When you change the electronic module you can clean the rear of the module of the old heat sink compound and apply new.
Remove the 4 Phillips head screws. These are extremely difficult to remove. Apply a LOT of downward pressure to prevent the screwdriver from damaging the screw head.
Once the base is removed you can see the electronic module. It is attached with the 3 Phillips head screws. Once removed the module lifts out. The heat sink compound is underneath and ensures good thermal contact with the upper Igniter housing.
89620-22360 Cressida vs 89620-14361 Supra Igniter Wiring Comparison - Detail
One can see the module connectors are identical. The labels embossed on the black potting material are the same. The wire colours on the two modules are the same.
The wire connector can be removed from the module with adequate heat from a soldering iron. Once hot the connector can be lifted off.
One should not apply too much heat for too long or you risk damaging the potting material and the electronic module.
I would like to see a 7MGE Igniter. I believe that the connections are identical and can be modified in the same way.
Dale