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TOPIC: Engine runs ruff at idle and no wake speed

Engine runs ruff at idle and no wake speed 18 May 2017 15:58 #1

  • bcabanaw
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I have a 2006 Bayliner 175 BR and last year the marina rebuilt the carbs and did a tune up. The engine seems to run ruff at idle and no wake speeds any ideas what the problem could be?

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Engine runs ruff at idle and no wake speed 18 May 2017 16:54 #2

  • yachtman
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Check for vacuum leak .around gaskets and linkages or hose left off. Bad pvc valve if you have one.

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1989 Avanti 3450 Sunbridge twin 454's

1979 Bayliner Conquest 3150 hull#23

1979 Bayliner Conquest 3150 hardtop hull#24
Twin chevy 350's

Engine runs ruff at idle and no wake speed 18 May 2017 17:04 #3

  • Vic Stewart
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Take it back to the marina. You paid for a tune up... Pardon my french but most of today's so-called mechanics don't know diddly about carbs.

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Vic Stewart SN
Past Commander
Cape Fear Power Squadron
Ft Myers Power Squadron
1998 2859 7.4 L/B2
Raw water cooled

Engine runs ruff at idle and no wake speed 18 May 2017 17:13 #4

  • njosephson
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Fuel filter? I had something similar when I had a tank of gas that had sat over the winter, I got REALLY good at changing filters that summer. After that I switched fual docks to a place that sold gas without ethanol and didn't have problems.

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1998 Bayliner 2858
7.4L MPI / Bravo III
Harbour Village Marina - Kenmore WA

Engine runs ruff at idle and no wake speed 18 May 2017 18:39 #5

  • bkc914
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VIC is correct, if that doesnt work ,find an old time drag racer that did his own work on rat motors and mouse motors. good luck

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Engine runs ruff at idle and no wake speed 18 May 2017 18:57 #6

  • Apurpura
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I have a 3.0 litre in my boat. The carb was rebuilt by the previous owner, I had it tuned up, replaced the plugs, wires and it still ran run rough. I brought it to an older marine mechanic that knew what he was doing and I had to replace the intake manifold because it was leaking due to rust. Manifold had a bunch of tiny leaks because it was rusting away, never seen anything like it. I also had to empty the fuel tank because it had water in it. I have a filter and water separator in it but the previous owner never emptied the tank or replaced the filters. I emptied the tank the other day I got about a gallon of water out of 40 gallons of gas. I was shocked I thought the guy was kidding me when he said empty the fuel tank it will make a difference. I went to HomeDepot and bought 20' 1/2 vinyl hose and siphoned it out of the sending unit. Make sure you have enough empty gas cans around to take the gas.

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Engine runs ruff at idle and no wake speed 19 May 2017 10:41 #7

  • bcabanaw
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My boat is a 2006 175 BR. I bought the boat off a guy last year that never used it. When I took it to the marina they said the carbs were gumed up and water in the tank. They rebuilt the carbs, changed the plugs and oil and put something in the gas tank to eat up the water. The boat runs fine just feels ruff when your at no wake speed. Also I don't have an hours meter on my dashboard and cant find one on the engine is there anyway to tell how many hours is on the engine it cant be much cause the engine looks brand new as its been hardly used in the last 11 years no rust or dirt and grim.

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Engine runs ruff at idle and no wake speed 19 May 2017 12:46 #8

  • Clirry
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Yuck! This thread makes me nervous to start up my 2005 175... but, heck gotta do it. Probably tomorrow morning.

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2005 Bayliner 175

Engine runs ruff at idle and no wake speed 19 May 2017 13:29 #9

  • Chief Alen
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Original poster what engine or outboard ?

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Be good, be happy, for tomorrow is promised to no man !

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Engine runs ruff at idle and no wake speed 19 May 2017 19:04 #10

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2006 Mercruiser 3.0

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Engine runs ruff at idle and no wake speed 19 May 2017 22:56 #11

  • 360 mafia
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Could be carb or crossed spark plugs.Take it back to marina.Don't expect them to confess they made a mistake.Its friday,not sunday

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Engine runs ruff at idle and no wake speed 20 May 2017 03:26 #12

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TKS - ites ?

Solenoid hanging up ?

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Be good, be happy, for tomorrow is promised to no man !

1994 2452, 5.0l, Alpha gen. 2 drive. Sold ! Sold ! Sold !

'86 / 19' Citation cuddy, Merc. 3.0L / 140 hp 86' , stringer drive. Sold ! Sold ! Sold !
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