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> Throttle position switch (TPS) repair, Contact surfaces are worn
rjames
post Jul 1 2009, 01:36 PM
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I'm wishing my Seattle teener was in Portland to be a guinea pig for you. I'll be looking into whether the TPS is the root of some hesitation issues soon. At least I know where to get one if needed.

Great job making this part available again! (IMG:style_emoticons/default/beer.gif)


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davesprinkle
post Jul 6 2009, 09:29 PM
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Jeff Bowlsby installed the board on his 2.0liter. His initial report is that the car runs as intended with the replacement board.

I've still got a tentative 2nd validation car lined up in Seattle this week. I'm getting close to releasing these for purchase.
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sixnotfour
post Jul 6 2009, 09:45 PM
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QUOTE
I've still got a tentative 2nd validation car lined up in Seattle this week.


Thanks for helping Mark . Jeff
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Mikey914
post Jul 6 2009, 09:55 PM
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I have a 76 2.0 that is local. Unfortunately, I still have some issues that I'm trying to work out. It runs, but after it gets warm the idle drops down. If you just want to check function it could work for you.

Just PM me.
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RoadGlue
post Jul 19 2009, 12:08 AM
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Bump! I REALLY want two of these ASAP. (IMG:style_emoticons/default/smile.gif) Any progress? Taking the 914 from Santa Rosa to San Diego and back in mid-august and I'd love to have at least one before I leave. My other 914 could use one too! Both are 2 liter cars with stock FI.
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davesprinkle
post Aug 24 2009, 10:53 PM
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OK everybody, sorry for the delay. I've completed the testing of the boards. $35.00 each. Ready to ship.
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RoadGlue
post Aug 24 2009, 11:49 PM
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Hooray! How do we order?
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davesprinkle
post Aug 25 2009, 08:42 AM
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QUOTE(RoadGlue @ Aug 24 2009, 10:49 PM) *

Hooray! How do we order?


You can either send me a Paypal (contact me via PM for address) or you can order through BRAG via the other site.
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RoadGlue
post Aug 25 2009, 03:35 PM
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I ordered two! Who's next?

*bump*
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davesprinkle
post Aug 25 2009, 06:37 PM
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QUOTE(RoadGlue @ Aug 25 2009, 02:35 PM) *

I ordered two! Who's next?

*bump*

Randy, I sent out your boards today. Thanks for the order.
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davesprinkle
post Jan 28 2010, 09:15 PM
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I just received the boards for the late 1.7liter cars. (Please note that these boards will not work on the early 1.7 cars. Completely different switches.) Sorry that this has taken so long. Here's a pic:


Attached thumbnail(s)
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pbanders
post Jan 29 2010, 10:44 AM
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Dave, this is all great stuff! Awesome engineering, planning, and implementation, too!

One other suggestion I would recommend to people who are replacing their TPS boards, and to owners who have board that are still working well, is to consider using a contact lubricant to reduce wear on the wiping trace. Two products are Deoxit D-5 and Stabilant 22. Both should extend the life of the TPS by reducing trace wear.

Note that because most of the wear happens near the start of the trace, because this is the area where you spend most of the time at part-load with a small throttle opening, while cruising.

Dave, I'll update my parts page with info on your board replacement.
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Rod
post Jan 29 2010, 12:29 PM
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QUOTE(davesprinkle @ Jan 29 2010, 03:15 AM) *

I just received the boards for the late 1.7liter cars. (Please note that these boards will not work on the early 1.7 cars. Completely different switches.) Sorry that this has taken so long. Here's a pic:



Mines a March 1973 1.7l, would this be correct for your new tps? Mine is filthy, so If correct I would love one..

Please let me know... rodsrugs(at)me.com
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davesprinkle
post Jan 29 2010, 07:12 PM
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QUOTE(Rod @ Jan 29 2010, 10:29 AM) *

QUOTE(davesprinkle @ Jan 29 2010, 03:15 AM) *

I just received the boards for the late 1.7liter cars. (Please note that these boards will not work on the early 1.7 cars. Completely different switches.) Sorry that this has taken so long. Here's a pic:



Mines a March 1973 1.7l, would this be correct for your new tps? Mine is filthy, so If correct I would love one..

Please let me know... rodsrugs(at)me.com


Yes, this board will work for your car.
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McMark
post Feb 3 2010, 11:29 PM
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Dave, could you add something in the Member Vendor forum? You'll probably sell more. (IMG:style_emoticons/default/wink.gif)
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johnwmrvw
post Feb 10 2010, 09:44 PM
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Hello, I'm interested in your circuit board. I live in Vancouver and work in Portland
(Gladstone to be exact) please reply and I can give my contact info!
thank you, John
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mikeg4
post Feb 16 2010, 08:31 PM
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[quote name='davesprinkle' date='Jun 15 2009, 05:14 PM' post='1181084']
I have a board house manufacturing these circuit boards right now. I expect the shipment on 22 June 09.
[/quote
I'd like to purchase a few of your boards.Are they still available?Do you have a 2 liter version?
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davesprinkle
post Feb 16 2010, 09:02 PM
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QUOTE(mikeg4 @ Feb 16 2010, 06:31 PM) *

QUOTE(davesprinkle @ Jun 15 2009, 05:14 PM) *

I have a board house manufacturing these circuit boards right now. I expect the shipment on 22 June 09.

I'd like to purchase a few of your boards.Are they still available?Do you have a 2 liter version?


Yes, I've got boards available for both the 2.0liter and late 1.7liter cars. $35/each. Send me a PM to discuss purchasing.
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ericread
post Feb 17 2010, 05:19 PM
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I purchased and installed the new TPS, but I'l having some difficulty in adjustment. Using the following adjustment guide, I tried to perform as directed:

Attached Image

But I just can't seem to get the Ohm Meter to go to zero.

Now, please take a look at my TPS:

Attached Image

Should the wires "C" between post "A" and post "B" always short between these posts, or is there an offset where the wire only either contacts post "A" or post "B", but never both at the same time?

In looking at my TPS, can you see anything else which my be causing my problems?

I drive a 1974 2.0L stock FI engine.

My thanks in advance.

Eric Read
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davesprinkle
post Feb 17 2010, 10:52 PM
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QUOTE(ericread @ Feb 17 2010, 03:19 PM) *

I purchased and installed the new TPS, but I'l having some difficulty in adjustment. Using the following adjustment guide, I tried to perform as directed:

Attached Image

But I just can't seem to get the Ohm Meter to go to zero.

Now, please take a look at my TPS:

Attached Image

Should the wires "C" between post "A" and post "B" always short between these posts, or is there an offset where the wire only either contacts post "A" or post "B", but never both at the same time?

In looking at my TPS, can you see anything else which my be causing my problems?

I drive a 1974 2.0L stock FI engine.

My thanks in advance.

Eric Read

Eric, the switch is designed with hysteresis (backlash) so that contact C is shorted either to post A OR to post B, but never to both simultaneously. In this way, the ECU can detect an opening throttle vs. a closing throttle.

But here is the problem with your TPS -- you've got a 2.0 liter board mounted in a 1.7 liter sensor plate. The 1.7 liter throttle rotates the opposite direction, so your mismatched sensor will never detect idle.
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