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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
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
I have a 2002 mercruiser 8.1 horizon in a cruisers yachts
I have a 2002 mercruiser 8.1 horizon in a cruisers yachts 3470 express. The starboard engine starts and idles fine but it will only reach 3500 rpm and in is sluggish. It does not pull as hard as it sh… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
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
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
I. Have a 2006 sea ray 340 sundancer with twin 8.1 horizon
I. Have a 2006 sea ray 340 sundancer with twin 8.1 horizon motors. The smart raft gauges displays where faded I bought a new set of 3 2-tach 1-speed same gauges no sea ray logo. Everything was plug an… read more
Charles
Charles
Certified Mercury Tech
5,471 satisfied customers
Sir, I have twin 2010 8.1S Mercruiser inboards in a 1997 Formula
Sir, I have twin 2010 8.1S Mercruiser inboards in a 1997 Formula PC34. The Port engine runs up to 4400 RPM which is perfect. The Starboard engine runs slowly to 3800 RPM. Asked my diver to check the p… read more
Noel Schembri
Noel Schembri
Marine mechanic
Diploma
1,804 satisfied customers
I have a 2004 Sea Ray 380 Sundancer. When I reach about 2800
I have a 2004 Sea Ray 380 Sundancer. When I reach about 2800 RPM, I have to push the starboard throttle lever significantly more forward than the port lever to get the RPM's to stay the same. The port… read more
Noel Schembri
Noel Schembri
Marine mechanic
Diploma
1,804 satisfied customers
I have a 2004 Sea Ray 390 Motor Yacht with Mercruiser 8.1 liter
I have a 2004 Sea Ray 390 Motor Yacht with Mercruiser 8.1 liter Horizons. I am only getting 4,000 RPM at max power. I had the props reconditioned and new 41-983 plugs installed. On the first run after… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
2001 Starboard 150HPDI engine ran smooth throughout the power
2001 Starboard 150HPDI engine ran smooth throughout the power ranges but faltered and quit. Returned home on Port engine. while at dock, the Starboard engine idles shakey between 300-400 rpm rather th… read more
orcamarine
orcamarine
Proprietor
Vocational, Technical or Trade Scho
7 satisfied customers
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.
Rigger, Diagnostician
Vocational, Technical or Trade Scho
1,074 satisfied customers
Good evening, I have a 2002 Silverton 352 with twin Mercruiser
Good evening, I have a 2002 Silverton 352 with twin Mercruiser 8.1 Horizons. 370 hours. Boat runs excellent. Port engine lately will not achieve rpm over 3700. Starboard will WOT at 4150. The throttle… read more
Ted G.
Ted G.
Rigger, Diagnostician
Vocational, Technical or Trade Scho
1,074 satisfied customers
I have a 2005 regal with twin mercruiser 496 mag 8.1 engines...
I have a 2005 regal with twin mercruiser 496 mag 8.1 engines... After running for about 30 minutes. The starboard engine start to cut out. It RPM eventually starts to swing you and down wildly. After … read more
Noel Schembri
Noel Schembri
Marine mechanic
Diploma
1,804 satisfied customers
I have a 2001 389 Aft Cabin with twin Mercruiser Horizon MPIs
I have a 2001 389 Aft Cabin with twin Mercruiser Horizon MPIs (454s) When the boat has been running for several hours, a rapid throttle down on my starboard engine frequently results in engine shut do… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
I have a 2003 Searay Amberjack with twin Mercruiser 5.7 Horizon
I have a 2003 Searay Amberjack with twin Mercruiser 5.7" Horizon 350's My starboard engine simply shut down as I was crusing back to my slip -- roughly 5- 5.5 knots (no Wake zone) and was not able to … read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
BOAT MOTOR - Yamaha 4 Stroke 40HP 2004 outboard boat motor.
BOAT MOTOR - Yamaha 4 Stroke 40HP 2004 outboard boat motor. I have aproblem with the engine transitioning from idle to higher RPMS and running at a fast idle speed. The engine starts readily and idles… read more
Jason Forsberg
Jason Forsberg
Outboard Marine Mechanic
Vocational, Technical or Trade Scho
531 satisfied customers
I have two 8.1 Horizon inboard engines in my 2001 34 foot Searay
I have two 8.1 Horizon inboard engines in my 2001 34 foot Searay Amberjack. When I raise the RPM speed to about 2400 the port engine starts to backfire, I changed the plugs and gaped them correctly. I… read more
ROCKET
ROCKET
MASTER CERTIFIED TECH
Vocational, Technical or Trade Scho
426 satisfied customers
I have a searay 360 with dual Horizon 8.1S engines. On third
I have a searay 360 with dual Horizon 8.1S engines. On third outing of season (approx total of 3-4 engine hours of no problems), took a trip of 24 miles this past weekend. After 20 miles at 3300 rpm,(… read more
gearheadII
gearheadII
Bachelor's Degree
138 satisfied customers
I have a new 2008 Tri-Toon Lowes boat that I just purchased,
I have a new 2008 Tri-Toon Lowes boat that I just purchased, and I am still in the process of breaking it in. The MerCruiser engine is a 5.0 L, 260 HP engine. Yesterday, the engine started great and r… read more
briggs archer
briggs archer
master marine mechanic
Associate Degree
374 satisfied customers
Starboard engine stall out I changed both filters going to
Starboard engine stall out I changed both filters going to the engine,But sounds like it is not getting enough fuel.Can you help.I have 2007 Mercruiser 4.3 Liter… read more
Dominick
Dominick
Marine Mechanic
Vocational, Technical or Trade Scho
1,009 satisfied customers
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Meet the Experts:

Ted G.

Ted G.

Rigger, Diagnostician

1,074 satisfied customers

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

Dominick

Dominick

Marine Mechanic

1,009 satisfied customers

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

John White

John White

Marine Mechanic

306 satisfied customers

11 years experience working on outboards, inboards, sterndrives & pwcs

Jason

Jason

Marine Mechanic

18,955 satisfied customers

Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

MerCruiser Certified Technician

11,406 satisfied customers

40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.

Jeff G.

Jeff G.

Marine Mechanic

4,730 satisfied customers

42 years experience, Certified Master Technician, All Major Outboards, Sterndrives, Hi-Performance

Captain Dave

Captain Dave

Marine Mechanic

2,672 satisfied customers

USCG Licensed Captain, 20+ Years Boating, Fishing, Maintenance and Repair Experience

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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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