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'94 SN 351 ProTec with carb backfiring? |
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MourningWood 
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Joined: June-13-2014 Location: NorCal Status: Offline Points: 917 |
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 Topic: '94 SN 351 ProTec with carb backfiring?Posted: July-09-2023 at 2:59pm |
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'94 351 SN carbureted with ProTec.
So, went to start after winter indoor storage. Battery fully charged, good grounds on batt cable. Backfiring out carb, won't run. From just sitting? Is this the beginning of the end for the ProTec?
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1964 Dunphy X-55 "One 'N Dun"
'I measured twice, cut three times, and it's still too short!" |
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MrMcD
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Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3750 |
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Posted: July-09-2023 at 6:10pm |
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Any chance moisture got into the electrical system? A little moisture can make the spark jump and cause misfires.
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MourningWood
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Posted: July-10-2023 at 10:47am |
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It stays indoors, covered. But I guess moisture is possible.
Before I rip out the ProTec and buy and install a conventional ignition system, are there any troubleshooting procedures that I can perform before tossing money and parts it? Thanks
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1964 Dunphy X-55 "One 'N Dun"
'I measured twice, cut three times, and it's still too short!" |
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MrMcD
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Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3750 |
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Posted: July-10-2023 at 1:38pm |
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I have zero Pro Tec experience to share. We may need to wait for Ken to catch this one.
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MourningWood
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Joined: June-13-2014 Location: NorCal Status: Offline Points: 917 |
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Posted: July-12-2023 at 1:15pm |
Fingers crossed on that. Also, JQ you have a PM-thanks.
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1964 Dunphy X-55 "One 'N Dun"
'I measured twice, cut three times, and it's still too short!" |
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KENO
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Joined: June-06-2004 Location: United States Status: Offline Points: 11116 |
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Posted: July-12-2023 at 4:08pm |
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ProTec and troubleshoot don't seem to belong in the same sentence here on CCF
People just wimp out and put a distributor in. If you e mail me at keno439@gmail.com I can send you a couple things I have that may or may not be useful A JQ PM, you must be wanting the RED DUI sales pitch
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MourningWood
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Joined: June-13-2014 Location: NorCal Status: Offline Points: 917 |
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Posted: July-17-2023 at 9:20pm |
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RESOLVED.
Cleaned a few grounds and ran the voltmeter around. Finally got around to battery test-50% charge. Charged fully-started right up-runs (on trailer) perfectly. In the end, I think it was a simple matter of low voltage causing spark scatter. To the Delta we go-thanks.
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1964 Dunphy X-55 "One 'N Dun"
'I measured twice, cut three times, and it's still too short!" |
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Jonny Quest
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Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 2979 |
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Posted: July-17-2023 at 9:42pm |
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Let's hope she holds together!
JQ
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Current
2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
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KENO
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Posted: July-18-2023 at 6:51am |
Since it was a "simple" matter, there must be a simple explanation of how low voltage causes spark scatter, in simple words for my simple mind
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MourningWood
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Joined: June-13-2014 Location: NorCal Status: Offline Points: 917 |
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Posted: July-18-2023 at 10:50am |
Sorry, if there is a simple explanation, I simply don't know what it is. I was led to this conclusion by comments in this old thread I came across... Also, much thanks for the excellent ProTec wiring diagram which helped me test the 'hot' pins for voltage, etc. https://www.speed-talk.com/forum/viewtopic.php?t=45017 |
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1964 Dunphy X-55 "One 'N Dun"
'I measured twice, cut three times, and it's still too short!" |
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MourningWood
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Joined: June-13-2014 Location: NorCal Status: Offline Points: 917 |
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Posted: July-24-2023 at 12:12pm |
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Great weekend on the Delta (HOT!). Boat performed perfectly.
I'll be keeping the battery fully charged! Thanks for all the help.
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1964 Dunphy X-55 "One 'N Dun"
'I measured twice, cut three times, and it's still too short!" |
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MrMcD wrote: