 TPS variations - has anyone else noticed this ?, trouble shooting and comparing 2 with same part numbers but different stop tabs etc |
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| DRPHIL914 |
  Jun 8 2020, 09:52 AM
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Dr. Phil  Group: Members Posts: 5,819 Joined: 9-December 09 From: Bluffton, SC Member No.: 11,106 Region Association: South East States 
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i will post a picture here of 2 OE TPS with part number that cross references to the 75-76 2.0 D-jet cars.
i recently pulled mine due to it bucking badly @ 2800-3400 rpm on part load or mild acceleration. i also have one from Gatornapper to test for him and he is sorting out his D-jet parts and prepping to eventually going back from carbs to FI. What i found was that the stop peg is located on a different place. his essentially stops the tps from going all the way to the bottom at idle but not at the top on acceleration. mine on the right. stops the pivot of the shaft from going all the way on the top and keeps it from being able to go off track on max, his would not. they have the same part number. neither had been tampered with. also i bought mine as an NOS part 7-8 years ago and now may need to be replaced. his on the left has much more wear, actually live testing it causes same bucking but at a different lower rpm, due to wear pattern. any thoughts? i will be putting a new board on mine as soon as it arrives Right now i am running with it unplugged and no skip buck or hesitation now. i had been thinking it may have been an issue with my rebuilt MPS or developers valve set up or a wire shorting somewhere else, but it’s the TPS. Attached thumbnail(s)  
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| JeffBowlsby |
Jun 16 2020, 10:08 AM
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914 Wiring Harnesses & Beekeeper Group: Members Posts: 8,890 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None
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Using the decel valve is said to reduces stress on the MPS diaphragm.
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| DRPHIL914 |
Jun 16 2020, 10:23 AM
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#3
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Dr. Phil Group: Members Posts: 5,819 Joined: 9-December 09 From: Bluffton, SC Member No.: 11,106 Region Association: South East States
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QUOTE(JeffBowlsby @ Jun 16 2020, 12:08 PM)  Using the decel valve is said to reduces stress on the MPS diaphragm. yes I have heard that so was reluctant to do this but looking at the set up I don't see how directly it would do that , its not like the MPS vac is hooked up to the decal directly , so other than just only allowing a slightly slower decel to minimize a sudden pull down or back pressure , I don't see how it would really protect it. that last MPS disc that gave out back a few months ago with the decel hooked up properly. BTW Jeff, I am ready for you to rebuild that MPS I sent you !!! @jeffbowlsby |
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Posts in this topic
DRPHIL914 TPS variations - has anyone else noticed this ? Jun 8 2020, 09:52 AM
SirAndy The part number printed on the boards is different... Jun 8 2020, 10:22 AM
DRPHIL914
The part number printed on the boards is differen... Jun 8 2020, 10:26 AM
DRPHIL914
The part number printed on the boards is differen... Jun 8 2020, 10:40 AM Nojoah Hmm interesting. The TPS I pulled off of my stock ... Jun 8 2020, 10:50 AM DRPHIL914
Hmm interesting. The TPS I pulled off of my stock... Jun 8 2020, 12:18 PM Nojoah
Interesting, that is really worn bad!! sa... Jun 8 2020, 04:24 PM bdstone914 Try a pencil eraser to clean it up. If the metal i... Jun 8 2020, 04:30 PM nordfisch You won't have to replace the board.
Just cle... Jun 11 2020, 12:10 PM DRPHIL914
You won't have to replace the board.
Just cl... Jun 11 2020, 12:45 PM nordfisch
231 is the number on mine, you are saying that t... Jun 11 2020, 01:23 PM DRPHIL914
231 is the number on mine, you are saying that ... Jun 11 2020, 01:30 PM nordfisch
[quote name='nordfisch' post='2824128' date='Jun ... Jun 11 2020, 02:25 PM DRPHIL914 ok update:
took advice here and i cleaned the sur... Jun 13 2020, 02:30 PM DRPHIL914 thought i’d post a picture after cleaning up the... Jun 15 2020, 06:19 AM nordfisch Hi,
the cold engine needs extra fuel AND extra air... Jun 15 2020, 12:28 PM DRPHIL914
Hi,
the cold engine needs extra fuel AND extra ai... Jun 16 2020, 07:23 AM Gatornapper Phil -
"disconnecting the decel allows the r... Jun 16 2020, 09:57 AM JeffBowlsby
"...so other than just only allowing a slig... Jun 16 2020, 10:43 AM |
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