 Need help .. Stuck on this darn MSD box |
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| mb911 |
 Sep 15 2019, 06:11 PM
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#1
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914 Guru  Group: Members Posts: 7,614 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest 
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So here is the deal.. Customer car has 4cyl with points and MSD box.
I remove the 4 cyl and put a -6 engine with pertronix in it. I re connect one of the cut wires from the msd box and do a resistance test.. All is good.. Engine runs funky with the MSD connected so I decide to run it with just the pertronix and disconnect the msd.. Engine runs great.. The harness was made by Perry and double checked everything and dont see any issues.. Also note the tach with the msd tach adapt is not accurate so assuming it is running 4cyl signal still? Any idea's? |
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| sportlicherFahrer |
Sep 15 2019, 07:23 PM
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Nothing to see here. Group: Members Posts: 1,123 Joined: 18-April 05 From: Tacoma, WA Member No.: 3,945 Region Association: Pacific Northwest
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I'd try it with the tach adapter wiring completely disconnected just to see if it changes(grey wire from box not connected at all), and then maybe try to get another box to plug in and test. Maybe test that box in a different known good car running a similar setup. Sounds like the other components are good.
I'm assuming the wires you reconnected for the cylinder select were matching colors? |
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Posts in this topic
mb911 Need help .. Stuck on this darn MSD box Sep 15 2019, 06:11 PM
sportlicherFahrer Which pertronix is it? (1,2, or 3) Is the MSD box... Sep 15 2019, 06:25 PM
mb911
Which pertronix is it? (1,2, or 3) Is the MSD bo... Sep 15 2019, 06:37 PM sixnotfour MSD Digital 6A and 6AL Ignition Control
6A - PN 62... Sep 15 2019, 06:37 PM mb911 @sixnotfour I am with you on this but I resoldere... Sep 15 2019, 06:44 PM sportlicherFahrer What tach is being used? Does it read correctly wi... Sep 15 2019, 06:51 PM mb911 Its. 4cyl tach currently. Could that be the issue... Sep 15 2019, 06:58 PM mb911 Oh and no does not read correctly but could not te... Sep 15 2019, 06:58 PM orthobiz I took out a Pertronix I recently and the little b... Sep 15 2019, 07:01 PM mb911
I took out a Pertronix I recently and the little ... Sep 15 2019, 07:04 PM orthobiz It's the little induction box thing that mount... Sep 15 2019, 07:20 PM sportlicherFahrer What plug wires are on the engine? MSD is incompat... Sep 15 2019, 07:09 PM mb911
What plug wires are on the engine? MSD is incompa... Sep 15 2019, 07:11 PM sportlicherFahrer How is it all wired up? Should look something lik... Sep 15 2019, 07:16 PM mb911
How is it all wired up? Should look something li... Sep 15 2019, 07:17 PM mb911 Sounds like a good plan.. And yes matching color f... Sep 15 2019, 07:27 PM sportlicherFahrer Also check and see if the rotor has a resistor in ... Sep 15 2019, 07:40 PM Retroracer Ben - couple of things to try:
1) maybe the Petro... Sep 15 2019, 07:47 PM mb911 I will check all those things.. Wiring is all new ... Sep 15 2019, 07:53 PM mb911 Called MSD this morning.. They feel I should isola... Sep 16 2019, 07:28 AM sportlicherFahrer It would be interesting to see if that makes a dif... Sep 16 2019, 07:33 AM mb911
It would be interesting to see if that makes a di... Sep 16 2019, 07:58 AM Retroracer ..kind of what I was suggesting? Temporarily take... Sep 16 2019, 08:55 AM mb911 I suppose it is. I will report back. Sep 16 2019, 04:26 PM sixnotfour I dont think its a pertronix problem, its the bund... Sep 16 2019, 04:33 PM mb911 So made home runs with the MSD harness and everyth... Sep 23 2019, 04:22 PM sportlicherFahrer Sounds like it was interference from having them a... Sep 23 2019, 04:26 PM sixnotfour :beer2: :first: Sep 23 2019, 04:26 PM mb911 I guess so.. Probably is to make it look nice now. Sep 23 2019, 06:52 PM sportlicherFahrer That's the fun part! :D :beer2: Sep 23 2019, 07:09 PM Retroracer Good to know you got to root cause though.
- Tony Sep 23 2019, 07:49 PM |
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