91 Celica GTS rebuild update

1188 Views 4 Replies 3 Participants Last post by Burnt91CelicaGT-S, 2 mo ago

Burnt91CelicaGT-S

Discussion Starter · 2 mo ago

So i managed to find a 93 GT convertible for parts and I've already taken off a few components. I noticed that the 93 distributor does not have a 5th cable that my 91 GTS had connected to an ignition coil? On the firewall. What would be the next best option i should take?

1. Use the 93 distributor on my 91 GTS
2. Find another distributor cap with all 5 plug wires
3. If i go with any of these 2 options, would i need to switch out the ECU? Or will my 91 ECU work with the 93 wiring harness? (I noticed they both have same plugs 2 small 2 larger plugs)

Open to all suggestions or comments. Thank you for your time. 👍

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sefiro

· #2 · 2 mo ago

From 91 to 93, toyota

moved the ignition coil to the distributor (thus eliminating the 5th wire
added a knock sensor on the firewall side of the engine block
other minor

The coil update changed the program in the ecu as it contains calculations for when to tell the igniter to release the coil's primary field for spark. These calculations include the length of time for signals to travel on wires.

You should either
- user 93 wire harness, distributer, igniter and ecu
...or....
- use the 91 write haness, distributed, igniter, ecu and external coil. Leave the 93 knock sensor installed but no wire attached to it.

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93celicaconv

· #3 · 2 mo ago

Burnt91CelicaGT-S, it sure looks like you had an engine bay fire in your 91 Celica. What was the cause of the fire? Are you looking to keep your original engine, but replace everything that was damaged by the fire? Was there a 1990 or 1991 salvage Celica available for your to grab parts from? Looks like you need a lot more than a distributor.

In addition to the differences pointed out by sefiro, there also was a difference in the intake manifold, your engine has a cold start injector where the 1993 5S-FE does not, the cams were slightly different, and, as sefiro stated, the ECU tuning was a bit more aggressive on the 93 engine (due to its ability to utilize the knock sensor). The 93 5S-FE is rated at 135HP, while your 1991 5S-FE is rated at 130HP.

I think you have a lot of parts and wiring to deal with if your intent is to repair your fired damaged components to maintain your 1991 engine & drivetrain.

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Burnt91CelicaGT-S

Discussion Starter · #4 · 2 mo ago

Thanks sefiro,

sefiro said:
From 91 to 93, toyota

moved the ignition coil to the distributor (thus eliminating the 5th wire

added a knock sensor on the firewall side of the engine block

other minor

The coil update changed the program in the ecu as it contains calculations for when to tell the igniter to release the coil's primary field for spark. These calculations include the length of time for signals to travel on wires.

You should either
- user 93 wire harness, distributer, igniter and ecu
...or....
- use the 91 write haness, distributed, igniter, ecu and external coil. Leave the 93 knock sensor installed but no wire attached to it.

Sent from my Pixel 5 using Tapatalk
[/QUOT

sefiro said:
From 91 to 93, toyota

moved the ignition coil to the distributor (thus eliminating the 5th wire

added a knock sensor on the firewall side of the engine block

other minor

The coil update changed the program in the ecu as it contains calculations for when to tell the igniter to release the coil's primary field for spark. These calculations include the length of time for signals to travel on wires.

You should either
- user 93 wire harness, distributer, igniter and ecu
...or....
- use the 91 write haness, distributed, igniter, ecu and external coil. Leave the 93 knock sensor installed but no wire attached to it.

Sent from my Pixel 5 using Tapatalk

Thanks for the info sefiro, looks like my best option might be to use the 93 harness and ecu. The harness on the 91 GTS burned pretty good i may not be able to salvage much from it. I appreciate your input.

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Burnt91CelicaGT-S

Discussion Starter · #5 · 2 mo ago

93celicaconv said:
Burnt91CelicaGT-S, it sure looks like you had an engine bay fire in your 91 Celica. What was the cause of the fire? Are you looking to keep your original engine, but replace everything that was damaged by the fire? Was there a 1990 or 1991 salvage Celica available for your to grab parts from? Looks like you need a lot more than a distributor.

In addition to the differences pointed out by sefiro, there also was a difference in the intake manifold, your engine has a cold start injector where the 1993 5S-FE does not, the cams were slightly different, and, as sefiro stated, the ECU tuning was a bit more aggressive on the 93 engine (due to its ability to utilize the knock sensor). The 93 5S-FE is rated at 135HP, while your 1991 5S-FE is rated at 130HP.

I think you have a lot of parts and wiring to deal with if your intent is to repair your fired damaged components to maintain your 1991 engine & drivetrain.

Thanks 93celicaconv,
Yes unfortunately, It happened to my brother, I was not present when it caught on fire. It was most likely a gas leak as he told me that it smelled like gas right before it caught fire. Luckily he was at home and next to a water hose and was able to put it out only 5 minutes after.

Ive had no luck finding individual parts or a whole 90-91 Celica with the same 2.2 5sfe. I found this 93 GT and assumed the parts would be nearly identical. Aside from the distributor.

My game plan was basically that, replacing all burned hoses/wires/valve cover as well as the intake plus throttle body from the 93. It seems it may not be that simple. Thanks for the info

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91 Celica GTS rebuild update

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