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I have a mercruiser 496 mag ho, and it won't rev over 3000
I have a mercruiser 496 mag ho, and it won't rev over 3000 rpms. No beeps or alarms changed plugs fuel pressure is good. Plugged in scanner no codes that would affect this situation. So i unplugged th… read more
Charles
Charles
Certified Mercury Tech
5,748 satisfied customers
I have a 2010 Merc 4 stroke 115 hp purchased new as a SeaFox
I have a 2010 Merc 4 stroke 115 hp purchased new as a SeaFox package. Last year the fuel primer bulb and tubing completely cracked and was replaced. This year following an overheat warning and engine … read more
Charles
Charles
Certified Mercury Tech
5,748 satisfied customers
I have a 2005 merc 496 mag with an overheat issue. Overheat
I have a 2005 merc 496 mag with an overheat issue. Overheat would occur when boat was on plane and engine was above 3500rpms. Found the water supply through the transom plate to be the issue. Had it r… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
I have a 2008 Chaparral 256 ssx with a 496 Mercruiser Mag.
I have a 2008 Chaparral 256 ssx with a 496 Mercruiser Mag. 200 hours and it is backfiring under load? Coming out of the hole it pops and hesitates or even on plan at top speed I feel a hesitation. Cha… read more
Ted G.
Ted G.
Rigger, Diagnostician
Vocational, Technical or Trade Scho
2,678 satisfied customers
I have a 496 ho mag thats been giving trouble. it appears to
I have a 496 ho mag thats been giving trouble. it appears to be fuel related. it was originally missing badly all of a sudden after being parked for about 5 months in then shed. I have so far replaced… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
Have a Honda BF225 outboard. It idles fine runs fine at low
Have a Honda BF225 outboard. It idles fine runs fine at low rpm. It revs up and planes off then the rpm drops to 1000, then back to 4000, then back to 1000 and so on?? I've changed all the fuel filter… read more
orcamarine
orcamarine
Proprietor
Vocational, Technical or Trade Scho
7 satisfied customers
I have Yamaha 200 HP (2004, 2-stroke, SX200C) with about 385
I have Yamaha 200 HP (2004, 2-stroke, SX200C) with about 385 hours on it. It's maintained and I use Yamaha Ring Free additive and Stabilz fuel stabilizers; fuels filters are changed out annually. Runs… read more
orcamarine
orcamarine
Proprietor
Vocational, Technical or Trade Scho
7 satisfied customers
I have a Formula 370ss with twin 496 Mags HO. Went to take
I have a Formula 370ss with twin 496 Mags HO. Went to take it out last night and getting to about 1,400 RPM the engines start cutting out and low on power. Acts like its not firing on all cylinders bu… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
Why wont the tach work on my 496 mag ho? I could have sworn
why wont the tach work on my 496 mag ho? I could have sworn it worked the other night when I was at the sellers house but didnt work on the sea trial. I tried pulling harness off engine an sprayed con… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,043 satisfied customers
I have a 2004 formula 382 Fastech w twin 496 HOs. The boat
I have a 2004 formula 382 Fastech w twin 496 HOs. The boat sat for some time and went out for the first time in a year last week,. The boat ran good about 60-61 at 5000rpms. After 15 minutes it shut d… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
Hi, I have a 30 ft boat with two Volvo Penta 5.0gxi 200 hs.
Hi, I have a 30 ft boat with two Volvo Penta 5.0gxi 200 hs. Never o proble, but now both engines started doing this: they crank and start right away, the work perfect up to 3000rpm, but at 3500rpm (pl… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
2004 Marine Power 496 mag HO, EFI with 85 hours. Was running,
2004 Marine Power 496 mag HO, EFI with 85 hours. Was running, but then acted like it ran out of fuel with a half a tank to go. Starts, but won't idle or run. It has a low pressure fuel pump and a high… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
Have a 454 in a 26,4800lbs boat.Boat climbs steadly to 3300RMP.
Have a 454 in a 26',4800lbs boat.Boat climbs steadly to 3300RMP. iT planes out ok, but then nothing more. increasing the speed and it starts to bog out & hesitate. Back to 3100-3300rmp. it runs fine, … read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 satisfied customers
Why would you drop 6 to 8 miles per hour after replaceing the
Why would you drop 6 to 8 miles per hour after replaceing the seales in the out drive? Have a 26' Formula Bow Rider with 405 Engin.… read more
capt ron 1959
capt ron 1959
Owner/Marine Mechanic
Vocational, Technical or Trade Scho
348 satisfied customers
I have a 1998 Mariah 214 Jubilee with a 350 mag V-8 5.7 litre,
I have a 1998 Mariah 214 Jubilee with a 350 mag V-8 5.7 litre, bravo III with dual 28 pitch props. The engine runs smooth, never hesitates to start when you touch the switch and does not cut out or ru… read more
mercmastertech
mercmastertech
Service Manager, Master technician
Technical School
249 satisfied customers
I recently purchased a 2002 350 Signature Chaparral with twin
I recently purchased a 2002 350 Signature Chaparral with twin 496 MAG HO sterndrive engines. Engines had 90 hours each. Before purchase the boat sat in dry dock for 2 years winterized. After using sev… read more
gearheadII
gearheadII
Bachelor's Degree
138 satisfied customers
i have 2007 mercruiser 496 mag bravoIII that overheats after
i have 2007 mercruiser 496 mag bravoIII that overheats after running hard and turning off engine. removed alot of hydrilla and replaced impeller. old impeller still intact no fins removed. has closed … read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 satisfied customers
I have twin 2002 200 Mercury EFIs. Recently they ...
I have twin 2002 200 Mercury EFI's. Recently they began to loss RPM's. At first the port would fall from 5700 to 5200 and the starboard would fall to 5000. If I came off plane and restarted they both … read more
Pappy's Sales and Service
Pappy's Sales and Service
Vocational, Technical or Trade Scho
586 satisfied customers
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Meet the Experts:

Ted G.

Ted G.

Rigger, Diagnostician

2,678 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

22,043 satisfied customers

Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

MerCruiser Certified Technician

11,409 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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