This has been an on-going problem ever since I installed a Delco Voyager ignition system on my starboard engine last fall. I check the wires before I leave the dock and all are properly seated on the spark plugs. After running about 10 or 20 minutes, I hear the starboard engine loose synchronization, dropping about 10 rpm. I check the spark plug wires and find that one, usually the #7 or #8, has slipped off of its plug. The wires seem to be securely attached to the plugs, requiring a good bit of effort to pull them off.
Any ideas what might be going on here?
Spark plug wires coming loose
Moderators: CaptPatrick, mike ohlstein, Bruce
Spark plug wires coming loose
Peter Schauss
Water-Lou
1978 B31 SF (BERG 1727M781-314)
Water-Lou
1978 B31 SF (BERG 1727M781-314)
Re: Spark plug wires coming loose
Try carefully snugging the metal fitting with a pair of pliers
Rawleigh
1966 FBC 31
1966 FBC 31
Re: Spark plug wires coming loose
Also try working the rubber boot down as far as you can.
Re: Spark plug wires coming loose
SP wires on your typical plug should snap on as the tip of the plug goes into boot metal female connector.
If they do not the boot is bottoming out on the plug shoulder or the connector needs a slight crimp.
If they are straight boots, pull the boots back and see if the connector will snap on and push the boot up onto plug.
Dielectric grease works well as a lube
If they are 45 or 90 boots, pull wire back out of boot and try connector on plug tip.
If they do not the boot is bottoming out on the plug shoulder or the connector needs a slight crimp.
If they are straight boots, pull the boots back and see if the connector will snap on and push the boot up onto plug.
Dielectric grease works well as a lube
If they are 45 or 90 boots, pull wire back out of boot and try connector on plug tip.
Re: Spark plug wires coming loose
The plug wires on my C115 Yamaha are very "lightly" attached to the plugs. It's more of a design issue than anything else, so I snug the boots tight to the plugs with wire -tys for added insurance.
1963 Bertram 25
1973 Boston Whaler 13 - sold!
1998 Scout 172 SF - beach taxi
1973 Boston Whaler 13 - sold!
1998 Scout 172 SF - beach taxi
Re: Spark plug wires coming loose
I have found some need to be “burped” as they can trap air and it pops them off.
A small wire tie is an old racing trick.
A small wire tie is an old racing trick.
Re: Spark plug wires coming loose
I replaced the wires which came from my EST ignition systems and the problem went away. The new wires were a couple inches longer than the old ones, so it is possible they were under some tension and were being pulled loose.
Peter Schauss
Water-Lou
1978 B31 SF (BERG 1727M781-314)
Water-Lou
1978 B31 SF (BERG 1727M781-314)
Who is online
Users browsing this forum: Bing [Bot] and 408 guests