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Ticking sound at idle on GT40 (shorting plug wire) |
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Canuck-Surfer 
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Joined: September-14-2019 Location: Ontario, Canada Status: Offline Points: 222 |
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 Topic: Ticking sound at idle on GT40 (shorting plug wire)Posted: July-20-2022 at 1:19am |
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Tonight I noticed a faint ticking sound on port side of engine. I could not isolate it but its more noticable on side vs front of engine. Sounds erratic and not related to rpms. Any ideas? Easiest to hear in video during first second or two and then in last 5 seconds. Its there whole time but easiest to hear at end. |
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1996 Sport Nautique GT40 EFI
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GottaSki
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Joined: April-21-2005 Location: NE CT Status: Offline Points: 3363 |
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Posted: July-20-2022 at 8:01am |
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huh. Naturally im not there, but that sounds a lot like arcing to me. try that again at night, it might be...illuminating
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"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."
River Rat to Mole |
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Canuck-Surfer
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Joined: September-14-2019 Location: Ontario, Canada Status: Offline Points: 222 |
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Posted: July-21-2022 at 1:05am |
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Great recommendation.
So I found some serious issues in the dark test. One of the wires was burned through and was arcing to the block. I could also see faint light at each of the spark plug boots. A storm was about to hit hard so I didn’t get a chance to test/view other side. Ken and Gary, I’m wondering if this is related to my idle loping after the new dizzy or even why PIP failed in old dizzy. The 28 hr old (post rebuild) wires AND plugs are OEM from skidim. What would cause oem wires to fail this soon? Should I be looking from another root cause or ground issue? |
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1996 Sport Nautique GT40 EFI
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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-21-2022 at 2:14pm |
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Wires need to be carefully routed. They run right next to the exhaust, exhaust is very hot and can burn right through your wires if they are too close. They do not need to touch to burn if they run very close it causes issues. Your light show tells you the plug wires are not up to the job. Routing is also important, you want to avoid letting wires touch each other as much as possible to avoid wires sparking between each other.
Standard ignition makes and sells good OEM quality plug wires. Denso offers them, Bosch, Napa I believe still offers Belden Powerpath wires which are high quality, these brands I mention give you original equipment quality not Race type wires. Your engine should run 20 years on a good set of OEM quality wires. The hard part is finding the correct lengths to work around your manifolds. You can measure your old wires and find a set that works or there are some that are sold as a Cut to Fit, you route them, measure and cut then crimp on the proper end for each wire. I hope some here have part numbers to share and help.
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Canuck-Surfer
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Joined: September-14-2019 Location: Ontario, Canada Status: Offline Points: 222 |
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Posted: July-21-2022 at 3:43pm |
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Thanks man. I am trying to source a set. Routing will be an issue. looking closer, I think these were burnt by the manifold. Also, are you saying that the 8mm OEM PCM wires that are new from last year are poor wires?
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1996 Sport Nautique GT40 EFI
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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-21-2022 at 5:09pm |
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No, I am saying PCM does not make wires, they are buying from a supplier. What they offer is the correct lengths. Routing issues probably caused your fast failure of wires burned through.
You did say there was a light show at every plug location so the PCM wire set is not containing the spark. That would tell me to look at another brand.
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KENO
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Joined: June-06-2004 Location: United States Status: Offline Points: 11112 |
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Posted: July-22-2022 at 7:10am |
I doubt that the PIP or distributor issues were because of this. It's getting a little confusing with the same questions in this thread and you "starting issues" thread
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Canuck-Surfer wrote: