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My Mercruiser Horizon 8.1 stalls after running at slow speed
My Mercruiser Horizon 8.1 stalls after running at slow speed for extended time. It will restart after sitting 25-30 minutes and run fine. This motor has the 'cool fuel' pump that cools the fuel using … read more
Jason
Jason
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Vocational, Technical or Trade Scho
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I have carbon plume at start up and the engine smells. My
Second opinion] I have carbon plume at start up and the engine smells rich… read more
Matthew John
Matthew John
Cert II Electronic Engineering
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RPM loss cannot go WOT. Mercruisers 8.1S HO, I need to know
boat was running great. I just had a transmission replaced on starboard but it seems to be running great. I also see white steam coming out on the back but I think I always had that, strainers are clean… read more
Jason
Jason
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Vocational, Technical or Trade Scho
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I have a 2014 Formula 350cbr with twin Mercruiser 8.1 I/Os.
I have a 2014 Formula 350cbr with twin Mercruiser 8.1 I/Os. A few days ago Starboard engine cut out while at cruising speed and won't restart. It cranks fine, sounds like it's not getting any gas. I w… read more
Jason
Jason
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Vocational, Technical or Trade Scho
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I have a cruisers yacht with two d9-575 Volvo penta diesels. The starboard engine is runn
I have a cruisers yacht with two d9-575 Volvo penta diesels. The starboard engine is running hotter than the other. This began at the end of last season in conjunction with a starting problem. At the … read more
Jason
Jason
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Vocational, Technical or Trade Scho
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2004 cruisers yachts 340 express with mercruiser 8.1s Horizons.
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Jason
Jason
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Vocational, Technical or Trade Scho
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Hi there. Im trying to figure out why I cant get my starboard
Hi there. I'm trying to figure out why I can't get my starboard engine (my boat is powered by twin merc 4.3L EFI's) running up to 3000+ RPM's to get on plane-my boat is a Regal 2860 Express cruiser (a… read more
Jason
Jason
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I have a 1979 Bertram 28 Flybridge Cruiser with original twin
I have a 1979 Bertram 28' Flybridge Cruiser with original twin Mercruiser/Chevy Model 350(228 hp) straight shaft eight cylinder engines. Please answer the following questions: 1. I seem to have old se… read more
Jason
Jason
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Vocational, Technical or Trade Scho
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I have twin mercruiser engines in my 32 boat. At idle and
I have twin mercruiser engines in my 32' boat. At idle and low rpms the engines run smoothly and seem fine. As the rpms increase to 3000 and above the starboard engine lags behind and won't make 4000 … read more
Ted G.
Ted G.
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Hi, I have a 2006 Searay Amberjack 290 with twin T-VD-350 Mercruiser
Hi, I have a 2006 Searay Amberjack 290 with twin T-VD-350 Mercruiser Marnum MPI Horizon engines (T-300 hp). It is inboard/v-drive, fuel injected, and has the Mercruiser Smart Craft System. The engines… read more
Ted G.
Ted G.
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Vocational, Technical or Trade Scho
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I have twin Mercruiser 8.1s Horizon on my Sundancer 370 and
I have twin Mercruiser 8.1s Horizon on my Sundancer 370 and recently I got problems (engine died) when running in Idle Speed for more than 15 minutes. After wait for 30 minutes, the engine started nor… read more
Jason
Jason
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Vocational, Technical or Trade Scho
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I have a 2001 8.1 L Horizon MerCruiser. My Starboard engine
I have a 2001 8.1 L Horizon MerCruiser. My Starboard engine will start them shut down. To get it to continue running I need to adavance the throtle. Anything above an idle the engine seems to run fine… read more
Whitecap36
Whitecap36
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Vocational, Technical or Trade Scho
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I have a 2005 34 SeaRay Sundancer. The boat is equipped with
I have a 2005 34' SeaRay Sundancer. The boat is equipped with twin MerCruiser, MIE 8.1 S Horizon gasoline powered engines. At 370 hours, the starboard engine had a catastrophic failure throwing a rod … read more
Jason
Jason
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Vocational, Technical or Trade Scho
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Hello. I have twin mercruiser 7.4 mags (380hp) horizon. The
Hello. I have twin mercruiser 7.4 mags (380hp) horizon. The starboard engine bogs at 2500 rpm. Three different companies/mechanics have worked on the issue with no resolve. 1) replaced fuel pump and r… read more
Jeremy R.
Jeremy R.
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i replaced the water rails on my 2001 horizon inboards cruisers
i replaced the water rails on my 2001 horizon inboards cruisers yachts they were solid with salt should i be concerned with the manifolds and risers they looked very clean the previous owner put only … read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
I have a 2004 Rinker 342 Fiesta Vee cruiser with twin 350 Mercruiser
I have a 2004 Rinker 342 Fiesta Vee cruiser with twin 350 Mercruiser Horizon EFI engines and Bravo 3 outdrives. The starboard engine is running a little rough and is putting out a lot of raw gasoline … read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
I have twin 8.1S inboard MerCruiser engines and after the
I have twin 8.1S inboard MerCruiser engines and after the winter, I went for a test drive and my rpms would only reach 3500 rpms. I found water in the fuel filters and put an additive in the fuel and … read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 satisfied customers
Hello I have a 2002 248 vista Four Winns express cruiser ...
Hello I have a 2002 248 vista Four Winns express cruiser with a 350 mag mercruiser. Recently purchased and ran like a top on sea trial and the first time out after purchase. Started it this past weeke… read more
Ted G.
Ted G.
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Meet the Experts:

Dominick

Dominick

Marine Mechanic

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25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified

Ted G.

Ted G.

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40 years boating, Safe boating instruct., Offshore Race promoter, Failure Analysis, Expert Witness

John White

John White

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Jason

Jason

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Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

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Jeff G.

Jeff G.

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Captain Dave

Captain Dave

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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