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Thread: Spark Plug Question
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09-02-2015, 04:09 PM #1Senior Member
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Spark Plug Question
I replaced my plugs a few weeks ago (AC Delco, not sure of the part nubmer, I think I got it out of the manual, will need to double check).
The boat immediately started running kind of rough. Like it has a slight miss. It is only noticeable at idle or barely cruising below about 10 mph. If you throttle up to wakeboard speeds you cant feel it. it may still be happening, but it isnt noticeable like at idle.
When I had the boat weighted heavily for surfing, it was extremely noticeable! I could hear it cutting out while surfing.
Any ideas what could cause this? I did not replace the plug wires. Could it be the plugs?
Which plug is everyone else using?2003 Mobius LSV GG Edition - Sold!
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09-02-2015, 06:09 PM #2Senior Member
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What gap did you set?
2007 Mobius LSV
1989 Sanger Skier DX - sold
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09-02-2015, 06:11 PM #3Senior Member
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I did not change the gap. The plug specs were the same as what the manual calls for. I realize that they could be off from the factory. I didn't check them. Could this be the issue?
2003 Mobius LSV GG Edition - Sold!
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09-02-2015, 06:18 PM #4Senior Member
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My experience with regular plugs is that the gap is not set by the manufacturer. I guess I don't know for these. I never install new plugs without checking.
Also, were the new plugs the same length as the old plugs?Last edited by gregski; 09-02-2015 at 06:20 PM.
2007 Mobius LSV
1989 Sanger Skier DX - sold
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09-02-2015, 07:18 PM #5
If you made sure the same gap was used for the new plugs as the boat manual calls for but you now have missing, you might have a damaged plug wire. This happens quite a bit when replacing them. If any of them were hard to remove, you might have broke the connection point from the wire to the connector on the plug.
My bet would be to replace the wires as well.Malo <--- Means--Evil or Mean One. This explains a lot.
2013 Mojo 2.5 Skylon Tower. Bestia < Beast >
[COLOR="#696969"]
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09-02-2015, 07:38 PM #6
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09-02-2015, 09:17 PM #7
+1 on the broken wire. It may be arcing inside the boot or cable if broken. It may also be that the boot didn't go on all the way or not correctly. The top of plug can go between the metal piece and the boot. Check the gaps as mentioned.
Be sure the top of the plug is screwed on fully. I had one back out once and was arcing. It ran but really rough. Let us know what you find.2007 XLV Gravity Games
Full Wake Makers upgraded ballast and pumps
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OJ 1435 prop, 325 EFI Indmar Assult.
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Bunch of other crap
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09-02-2015, 09:34 PM #8Senior Member
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Some caps were extremely hard to remove. I did check to make sure the caps were pressed on firmly. They all seemed to be good. I'd like to replace the plug wires. I had planned to do it at the end of the season anyways. Close enough I guess. Where is the best place to buy? Brands? Links?
2003 Mobius LSV GG Edition - Sold!
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09-02-2015, 09:35 PM #9Senior Member
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Plug wires are blue and have numbered stickers on them. Not sure if original or not. Thanks for the replies everyone.
2003 Mobius LSV GG Edition - Sold!
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09-02-2015, 10:44 PM #10Senior Member
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http://www.skidim.com/mobile/WIRE-SE...nfo/75%2D6002/
is this what I need? If so is there a napa cross reference part number?2003 Mobius LSV GG Edition - Sold!