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Originally Posted by getrdunn
(Post 4655441)
Ground straps and all connections and including main Mercury plug all good. As mentioned possible cracked plugs. Fire it up in the dark and check for any arcing etc. just a thought. I've identified some electrical issues in the dark. I have a new DUI with plug wires if your interested in purchasing or just to try. Just pay shipping. Process of elimination. New plugs and believe it or not it wouldn't be the first time even fuel at the pump can be contaminated with water. Happened up north here and cost the station a brand new Diesel engine. |
Maybe try some brake cleaner and some electrical grease. Might be a long shot but worthy. These kind of issues can drive you nuts. Many of us been there and in some cases it's the simple things we over look. Let me know if you'd like to throw the flame thrower in I have. I'd be happy to ship out for you to try. |
I go with contact cleaner instead of brake cleaner. Brake cleaner is most likely gonna wreak havoc with the rubber/plastic materials of the plug. It is also very flammable if you decide to use getrdunns flame thrower. 😂 |
I use battery cleaner, then blow out. Awesome for trailer plugs too...just sayin. Do decent of snowmobile trailing and those plugs get nasty.:)Then my carburetor files for the female part. Male parts usually okay,but if not some emery cloth or fine grit sand paper small strips and use like polishing a crank. Slightly split male prongs. Slightly ! I've pilled some boats harness plugs apart and some people over did it. Doh !
Oh, pet peeve of mine: Do not put Dielectric grease on contact part of electrical plugs. Why do people do this ? Ugggh. It does not pass electricity. uggghh. It helps seals out the elements.:) |
Originally Posted by SB
(Post 4655524)
I use battery cleaner, then blow out. Awesome for trailer plugs too...just sayin. Do decent of snowmobile trailing and those plugs get nasty.:)Then my carburetor files for the female part. Male parts usually okay,but if not some emery cloth or fine grit sand paper small strips and use like polishing a crank. Slightly split male prongs. Slightly ! I've pilled some boats harness plugs apart and some people over did it. Doh !
Oh, pet peeve of mine: Do not put Dielectric grease on contact part of electrical plugs. Why do people do this ? Ugggh. It does not pass electricity. uggghh. It helps seals out the elements.:) |
Sounds to me like a firing order issue. Double check your plug wire routing. Std firing order is 1-8-4-3-6-5-7-2 . Clockwise rotation.
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Originally Posted by MILD THUNDER
(Post 4655533)
Sounds to me like a firing order issue. Double check your plug wire routing. Std firing order is 1-8-4-3-6-5-7-2 . Clockwise rotation.
I guess about as good as having two bad cannon plugs. 🤷🏼*♂️ |
Originally Posted by payuppsucker
(Post 4655538)
But it’s common to both motors.....what’s the chances of Focking it up twice? I guess about as good as having two bad cannon plugs. 🤷🏼*♂️ |
When i built my 598 CI for my Daytona - on first fire up it wouldn't idle and ran like crap. Turns out I wired the plugs for normal firing order.
Checked the cam card and it didn't say anything about 47 swap. BUT there was a 47 on it so I did the swap. Ran great. |
Originally Posted by payuppsucker
(Post 4655538)
But it’s common to both motors.....what’s the chances of Focking it up twice? I guess about as good as having two bad cannon plugs. 🤷🏼*♂️ |
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