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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
5,471 satisfied customers
Year 2000 Mercruiser 496 Mag: Boat will not stay on plane,
year 2000 Mercruiser 496 Mag: Boat will not stay on plane, seems to starve for fuel after about 5 seconds. It's fine til then. Idles perfect and revs fine in neutral. Attached fuel pressure guage and … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
7.4 1997 Chevrolet MPI engine will only get 3800 rpm, found
7.4 cid 1997 Chevrolet MPI engine will only get 3800 rpm, found low psi on fuel pump and replaced fuel pump which improved rpm only 600 rpm to 3800. Prior rpm was only 3200. Scan tool shows no codes. … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
I have to replace the idler pulley on my 496 mag HO engine.
I have to replace the idler pulley on my 496 mag HO engine. Mercury marine sent a photo of it to me (manual 30 section 4C tensioner) but did not explain how to release the tension so I can remove and … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,504 satisfied customers
I have a mercruiser 350 mag mpi engine serial # XXXXX (bravo
I have a mercruiser 350 mag mpi engine serial # XXXXX (bravo one) . My problem is I can start my boat, as soon as it starts I release the key from "start" to "run" and the motor instantly dies. It wil… read more
MarineService8
MarineService8
34 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
18,955 satisfied customers
I have a single engine 28 Nordic with a 496 Mag /Bravo 3.
I have a single engine 28' Nordic with a 496 Mag /Bravo 3. Engine is a 2009 remanufactured in 2012, Serial # XXXXX series. Getting all the standard unimportant codes such at Pitot CKT LO , FUEL CKT LO… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
just looking for ideas... i have 496 ho mag which after faultless
just looking for ideas... i have 496 ho mag which after faultless service has suddenly dicided to start missing and causing bad vibrations. it had been trailered for 4 months before this. i have so fa… read more
Malta Tech
Malta Tech
Marine Tech
High School or GED
287 satisfied customers
What could cause my fuel pump fuse (15A) to keep blowing when
What could cause my fuel pump fuse (15A) to keep blowing when I try to give it gas to get up on plane? If I replace the fuse, the engine will start again and I can drive slowly and also rev the engine… read more
Noel Schembri
Noel Schembri
Marine mechanic
Diploma
1,804 satisfied customers
I have twin 2007 Mercury 496 MAG and my boat have you heard
I have twin 2007 Mercury 496 MAG and my boat have you heard anything about black paint coming off of the inside of the fuel cooling system and cloging the fuel injectors and other fuel related parts… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
Have a 95 SeaDoo XP, Got it in pieces with a blown out engine.
Have a 95 SeaDoo XP, Got it in pieces with a blown out engine. Replaced engine with a Short Block from SBT. Rebuilt the Carbs but I am not sure of how the gas lines should go togehter. I have the shop… 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
I have a 2005 Cobalt with 496 Mercruiser engine. With gradual
I have a 2005 Cobalt with 496 Mercruiser engine. With gradual throttle advance, engine stutters at ~1100 rpm and loses power. If we throttle back and then rapidly advance to full throttle, it runs fin… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
I have a 2003 Mercruiser Mag 350 serial OM587340. Engine idles
I have a 2003 Mercruiser Mag 350 serial OM587340. Engine idles fine and runs well at 3000-3500 rpm for 5-10 min. Engine then bogs/hiccups and will not maintain rpms. Changed fuel/water separator and f… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
I have a Campion 645i with a Mercruiser 350 motor. The fuel
I have a Campion 645i with a Mercruiser 350 motor. The fuel (petrol) has been contaminated with water. What's the easiest way to empty (and flush) the fuel tank? My local mechanic (I'm in Malta) was h… read more
Jeremy R.
Jeremy R.
5,362 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
Mercruiser 350 Mag MPI Tow Sports engine in 2001 Tige. Fuel
Mercruiser 350 Mag MPI Tow Sports engine in 2001 Tige. Fuel pump and Cool Fuel runs on when ignition shut off. Continues to run until battery dead or switched off. Suggestions?… read more
mercmastertech
mercmastertech
Service Manager, Master technician
Technical School
249 satisfied customers
Have just paid to have a old Mercruiser 165 replaced with an
Have just paid to have a old Mercruiser 165 replaced with an EFI 4.3 sterndrive. Any interruption to fuel flow from the main tank (sloshing unporting fuel line outlet) appears to result in bad fuel st… read more
Mechman45
Mechman45
Vocational, Technical or Trade School
152 satisfied customers
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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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