 TPS replacement, 1971 1.7L |
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| falconfp2001 |
 Apr 2 2011, 08:06 PM
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#1
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Pancho Pantera  Group: Members Posts: 451 Joined: 5-December 10 From: Downey, CA Member No.: 12,456 Region Association: Southwest Region  |
I was having problems with the Throttle and my TPS. Way to much slack and the circuit board was grooved.
So I decided to replace. Here is a a 73 on the left and a 71 on the righ 73 has 5 terminals and the 71 has 4. the 73 also has a different location for the return spring than the 71. Attached thumbnail(s) 
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| falconfp2001 |
Apr 2 2011, 08:07 PM
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#2
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Pancho Pantera Group: Members Posts: 451 Joined: 5-December 10 From: Downey, CA Member No.: 12,456 Region Association: Southwest Region |
When I popped the covers off you can tell there is a little more thought put into the 73. Technically both switches only use two terminals but which on is the key.
Attached thumbnail(s) 
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| falconfp2001 |
Apr 2 2011, 08:09 PM
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#3
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Pancho Pantera Group: Members Posts: 451 Joined: 5-December 10 From: Downey, CA Member No.: 12,456 Region Association: Southwest Region |
71 now on the left and 73 on the right
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| falconfp2001 |
Apr 2 2011, 08:11 PM
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#4
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Pancho Pantera Group: Members Posts: 451 Joined: 5-December 10 From: Downey, CA Member No.: 12,456 Region Association: Southwest Region |
You can tell that the 73 TPS is more serviceable. I was stunned by how clean it looked.
Attached thumbnail(s) 
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| falconfp2001 |
Apr 2 2011, 08:16 PM
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#5
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Pancho Pantera Group: Members Posts: 451 Joined: 5-December 10 From: Downey, CA Member No.: 12,456 Region Association: Southwest Region |
Here is a shot of the bottom of the 73 TPS. You can see it is numbered according to the schematic. 14 is not used but 9 and 20 are. IF you are using a 4 pin connector from an early FI harness. connect from 9 over and it should be fine.
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| falconfp2001 |
Apr 2 2011, 08:19 PM
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#6
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Pancho Pantera Group: Members Posts: 451 Joined: 5-December 10 From: Downey, CA Member No.: 12,456 Region Association: Southwest Region |
Heres a shot of the TPS connected. You can make out the numbers from this side as well. Remember, 14 is not used.
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| falconfp2001 |
Apr 2 2011, 08:25 PM
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#7
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Pancho Pantera Group: Members Posts: 451 Joined: 5-December 10 From: Downey, CA Member No.: 12,456 Region Association: Southwest Region |
Test drive with the 73 TPS was a success. Seems to have more acceleration and definately steady when partial load is on gas.
The Slack in the 73 TPS throttle body shaft and butterfly was almost non-existent. I was told that the serrations on the boards are different but I surmised that the serrations were for extra pulses during acceleration and not for any value for the ECU. Operation is smooth and now I'm gonna find me a back up for the future. |
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