 TPS Testing |
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| cabrioartie |
 Mar 18 2026, 05:09 PM
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#1
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Newbie  Group: Members Posts: 19 Joined: 8-October 24 From: Las Vegas, NV Member No.: 28,400 Region Association: None 
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The car is a '74 2.0l, trying to fix all the items wrong after purchase.
Have found the following items bad and have replaced them: - MPS - AAR - Decel Valve - CHT - Spark plugs and wires I have a bogging/lack of power at about 3000 RPMs, I assumed it was the TPS. But, testing it with the 20 click method I get all 20 clicks consistently. My question is, is this a valid test to ensure the TPS is good? And if no, how else should I test it? And if yes, what else could be wrong to cause the problem? |
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| bdstone914 |
Mar 18 2026, 05:27 PM
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#2
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bdstone914 Group: Members Posts: 5,274 Joined: 8-November 03 From: Riverside CA Member No.: 1,319 |
QUOTE(cabrioartie @ Mar 18 2026, 04:09 PM)  The car is a '74 2.0l, trying to fix all the items wrong after purchase. Have found the following items bad and have replaced them: - MPS - AAR - Decel Valve - CHT - Spark plugs and wires I have a bogging/lack of power at about 3000 RPMs, I assumed it was the TPS. But, testing it with the 20 click method I get all 20 clicks consistently. My question is, is this a valid test to ensure the TPS is good? And if no, how else should I test it? And if yes, what else could be wrong to cause the problem? Pull the cover and inspect the traces on the circuit board. They can get worm. Sometins the arms can be bent to get the points to contact solid traces. |
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| emerygt350 |
Mar 18 2026, 05:47 PM
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#3
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Advanced Member Group: Members Posts: 3,483 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
The clicks are a good method. If the TPS is shot you can get a complete cut at cruise or the loss of clicks. Is the bog you mention like a carb or does it feel like a complete engine wide miss?
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| mgphoto |
Mar 18 2026, 07:00 PM
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#4
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"If there is a mistake it will find me" Group: Members Posts: 1,418 Joined: 1-April 09 From: Los Angeles, CA Member No.: 10,225 Region Association: Southern California |
QUOTE(cabrioartie @ Mar 18 2026, 03:09 PM) The car is a '74 2.0l, trying to fix all the items wrong after purchase. Have found the following items bad and have replaced them: - MPS - AAR - Decel Valve - CHT - Spark plugs and wires I have a bogging/lack of power at about 3000 RPMs, I assumed it was the TPS. But, testing it with the 20 click method I get all 20 clicks consistently. My question is, is this a valid test to ensure the TPS is good? And if no, how else should I test it? And if yes, what else could be wrong to cause the problem? I’ve found that the bog down at 3k is a distributor issue. Swooped in a 123 problem solved. |
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