Engine Missing Causes.
#1
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Thread Starter
Engine Missing Causes.
I have a 79 Formula with a Merc 260. Went through the whole boat this past winter. The motor ran well last summer so I left that alone. It has 600 hrs on it and is in very good health. It has an edelbrock carb on it. I took it out for the first time today since the resto. I noticed going through the harbor, the idle missed a tiny bit. I just assumed from sitting. I warmed up then hit the gas. It ran well. Did 54mph on GPS @5000rpm with full fuel and a passenger. we then settled into a 3000-3500 rpm cruise. The boat developed a bad miss. Struggled to get on plane. It was also missing when idling in gear. Out of gear it seemed ok. I have brand new plugs in it. Also I swapped out the cap and no change. It ran great all last year. Any ideas?
#5
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Changed the cap an rotor. The plugs are also brand new. The wires are relatively new. It was also surging a bit idling back to the marina. I have heard that its a fuel delivery issue.
#6
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I had a miss in the mid range went thru my whole electrical. Thought for sure it was some kind of electrical causing it, bad plug, cap, rotor, wire, Ect. Nope it was the dam carb. Bought new carb(wanted a little bigger anyways) and was fine then two years later it did the same and was carb again, rebuilt and was fine. Ethanol gas sucks .
#9
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There are a couple threads on here about those carbs. Something about epoxying something in the bottom of them. The guy that I rent a shop from did this last year and cleared up all of his loading up and missing.
#10
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I went thru this a few times with Q-Jets. The ethanol anymore ruins rubber parts in Carbs...just know this and run either pure gasoline or learn how to go thru your carbs periodically. I am in the process of securing a new pair of Quick Fuel Double Pumpers which will help alot.
That $hit plays hell on everything rubber thats not designed for it. My 79 Formula is getting all new hoses in the fuel system because of it.
That $hit plays hell on everything rubber thats not designed for it. My 79 Formula is getting all new hoses in the fuel system because of it.