123 Distributor Install - post-mortum, MPS was “bad”? But it isn’t? |
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123 Distributor Install - post-mortum, MPS was “bad”? But it isn’t? |
FlacaProductions |
May 12 2024, 10:14 AM
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#1
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Senior Member Group: Members Posts: 1,733 Joined: 24-November 17 From: LA Member No.: 21,628 Region Association: Southern California |
Many of you followed and helped as I attempted to install a bluetooth 123 distributor in my 74 2.0 here:
http://www.914world.com/bbs2/index.php?sho...=368374&hl= I can’t thank everyone enough for all of their input. Car originally ran pretty well but I was installing the 123 to fix a running-warm situation due to a failed vacuum can on the stock distributor. (0231174011 with Pertronix Igniter II) MPS was a clearly opened/modified 0280100041 (done by PO). The install proved difficult/frustrating (would NOT start) and everything from a bad 123 unit to not accurately finding TDC was suspected. Luckily, I had recently picked up a stock/unopened 0280100043 MPS and after installing and re-installing the 123 multiple times, confirming TDC, etc, etc, I was desperate. I know you’re not supposed to just “throw” parts at a problem, but in a last-ditch effort I dropped in the “new” 043 MPS and it immediately fired up. Runs GREAT. This is where things get confusing: The 041 tests ok out of the car - 15lbs of vac for 30 mins and I get 95 ohms across 7 and 15 and 345 ohms across 8 and 10. The 041 had obviously been opened and I assume modified/repaired - but again - it ran fine in conjunction with the stock distributor w/Pertronix. Why would it run just “fine” (outside of the conditions caused by the failed distributor vacuum can) with the stock distributor/041 MPS and yet not even come close to starting with the 123/041 combo, and then run great with the 123/043 setup? Now i’m on to dialing in/playing with curves - I’ve found really nice performance with one that Pete Stout posted. Even though his is a 1.8, it made a noticeable difference to the point where my nephew remarked that it was really “snappy” now. Other than that, I think i’m going to pop the 2 female pins out of the wiring harness that the 123 yellow and white wires plug into and shrink wrap them for a more solid connection. That seems like a weak link. Additional questions: - does my original distributor with Pertronix have value to anyone? The Pertronix itself is $100+ new. I can’t see needing to keep it as a backup when the vacuum can has tested bad and the 123’s are seemingly bulletproof once properly installed. - does my 041 MPS have value? Should I open it up or have it tested and potentially rebuilt? As it sits, it totally immobilizes my 914 when installed. Is there potential to have it turned into a viable backup? Again - thanks to The World. I learned a lot during this process and could NOT have gotten to the other side without all the input here! |
FlacaProductions |
May 12 2024, 11:38 AM
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#2
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Senior Member Group: Members Posts: 1,733 Joined: 24-November 17 From: LA Member No.: 21,628 Region Association: Southern California |
Yes - My Mityvac is in Indiana so I won't be able to do it until July but I will map it out to the best of my ability and that of my tools/meter.
I'd love to tear it down - yes - maybe a Tangerine MPS kit will bring it back to life depending on what I find. Still curious as to why the 041/123 combo was DOA and the 043/123 is magic. |
Superhawk996 |
May 12 2024, 11:59 AM
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#3
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914 Guru Group: Members Posts: 6,469 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch |
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