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Discussion Starter #1
i did a swap today (5mge to a 6m) and when i was plugging in the injector harness, as i went to plug in the TPS plug the plug had 4 prongs but the 6m TPS had only 3. which i just figured it was because of the engine difference but then it dawned on me that the car that i pulled the 6m out of was an '84 that had a 5mge that i pulled out of it. I don't understand why the '84 had a 3 prong plug but then one that got the transplant today had a 4 prong plug.

what (if any) is the difference between the 2 TPS models?
 

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There are a ton of differences between the 3 prong (square) and 4 prong (round) TPS's. The only way you can swap them over is by swapping the whole throttle body.

The square TPS is more like a on/off/on switch and the round TPS is more like a rheostat.
 

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Discussion Starter #5
i ended up switching out the whole TB, just wanted to make sure that it wasn't going to effect the way the car ran. Thanx guys.
 

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iirc, 85 5mg tps (round) requires 85 ecu and 84 tps (square) requires 84 ecu
 
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