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I have a m18 universal diesel in my sailboat and it runs
Hello I have a m18 universal diesel in my sailboat and it runs great in neutral I can rev it all the way up to 3000 rpms but as soon as I put it in gear the rpms droop right away and the motor starts … read more
Jason
Jason
Marine Mechanic
18,645 satisfied customers
I have a 2007 Mercruiser 496 that reason runs ok with no
Hi Jason, I have a 2007 Mercruiser 496 that for some reason runs ok with no load (idle might be a little rough) and I can take it up to 3200 RPM's no load. When I try and get the boat on plane I can o… read more
Jason
Jason
Marine Mechanic
18,645 satisfied customers
2004 Tige boat with 5.7L Marine Power Engine. Runs fine without
2004 Tige boat with 5.7L Marine Power Engine. Runs fine without load, will not run correctly under load. Fuel Pressure good, TPS replaced, Cam and crank sensor replaced, distributor replaced. fuel fil… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
Volvo Penta Diesel D1-30F, installed with sail drives in sailing
Volvo Penta Diesel D1-30F, installed with sail drives in sailing catamaran. One engine runs fine and revs under load at full throttle to 2800 rpm. Other engine runs fine on normal throttle up to 2000 … read more
Jason
Jason
Marine Mechanic
18,645 satisfied customers
I have a Yanmar 2QM15. I changed the secondary fuel filter
I have a Yanmar 2QM15. I changed the secondary fuel filter the other day, and now my boat is belching out black smoke. When I originally changed the filter, I didn't realize the fuel had to be bled ou… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
1976 mercruiser with in line 6 230 chevy 165 hp. old motor
1976 mercruiser with in line 6 230 chevy 165 hp. old motor ran fine until it cracked a block. rebuilt motor will rev up to 4000 rpm in gear, out of the water. Put it in the water and it will only rev … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
1999 115hp Johnson on Bennington 26ft pontoon. Idles fine after
1999 115hp Johnson on Bennington 26ft pontoon. Idles fine after start. at higher rpm will begin to cut out backing the throttle down takes away the problem. Can run all day fine or may act up all day.… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
We have a 2004 tracker targa 16 wtwitha 1999 evinrude ficht
We have a 2004 tracker targa 16 wtwitha 1999 evinrude ficht 90hp outboard. The motor starts and idles great, revs in neutral great. When under load accelerating it had a pretty bad miss. Only between … read more
davesoutboard
davesoutboard
owner
Associate Degree
1,570 satisfied customers
I have a Yanmar 3 cylinder diesel engine (3GM30F) in my boat
I have a Yanmar 3 cylinder diesel engine (3GM30F) in my boat with 1360 hours. When I advance the throttle quickly with the transmission engaged, the engine blows black smoke and water and I do not hav… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
I have a merc 350 mag mpi . Last year had water in fuel . emptied
I have a merc 350 mag mpi . Last year had water in fuel . emptied tank and cleaned replaced all filters. Boat idels fine but when going to get on plane motor hesitates ,backfires and stalls . Restarts… read more
Jason
Jason
Marine Mechanic
18,645 satisfied customers
I have a 466 w/ 480 volvos, after running 4 to 8 hrs soot builds
I have a 466 w/ 480 volvos, after running 4 to 8 hrs soot builds on transom. Had injectors replaced, tanks polished, filters changed regularly, props tuned & bal. Engines only have 500hrs. Bottom clea… read more
Jason
Jason
Marine Mechanic
18,645 satisfied customers
2001 MarinePower 7.4L (454 BB) rpms drop from 4100 to 3,000
2001 MarinePower 7.4L (454 BB) rpms drop from 4100 to 3,000 under load after running fine for 20+ minutes or so, will regain cruising rpm after short shutdown (less than 10 minutes). Cleared all fuel … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
I have a 2006 yamaha 150 hp vmax hpdi outboard on my Stratos.
I have a 2006 yamaha 150 hp vmax hpdi outboard on my Stratos. It is hard to start and stalls out constantly until engine seems to warm up. Then it will run fine at idle. When i throttle up the hole sh… read more
Jason
Jason
Marine Mechanic
18,645 satisfied customers
I HAVE A 1992 90HPJOHNSON IT IDLES FINE BUT WHEN YOU PUT IT
I HAVE A 1992 90HPJOHNSON IT IDLES FINE BUT WHEN YOU PUT IT IN GEAR IT SPITS OR MISSES AND AT TIMES WILL NOT GO OVER 3200RPMS I HAVE REPLACED PLUGS&WIRES; FUEL FILTERS,COILS,VRO2PUMP,COMPRESSION TEST … read more
Jason
Jason
Marine Mechanic
18,645 satisfied customers
I have an Evinrude Ficht Ram 150HP, y.2000, E150FPLSSM. Cylinder
I have an Evinrude Ficht Ram 150HP, y.2000, E150FPLSSM. Cylinder no. 6 is not firing. When I try disabling each with software, on every other the motor sound changes, but when I disable no.6, sound st… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,729 satisfied customers
I have a 1986 21.5 foot bayliner Bowrider. Purchased 3 years
I have a 1986 21.5 foot bayliner Bowrider. Purchased 3 years ago with a volvo penta GM 305 with rochester quadrajet. The secondaries would never fire. Due to a new boater right of passage I had to rep… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
My 454 magnum, 1990 will start and seems to run fine to about
My 454 magnum, 1990 will start and seems to run fine to about 2500 rpm. then it has severe backfiring. I have checked/replaced fuel and water filter, plugs, distributer cap. I have not checked/replace… read more
Joe
Joe
Owner Kingsland Auto & Marine Services
Vocational, Technical or Trade Scho
1,372 satisfied customers
Hi, I have a 2004 Mercury 115hp 4-stroke EFI outboard, when
Hi, I have a 2004 Mercury 115hp 4-stroke EFI outboard, when i rev the engine on neutral sounds fine and will rev up till rev limiter, but in gear or under load, it will start bogging past 3500 rpm and… read more
TOM
TOM
Vocational, Technical or Trade Scho
196 satisfied customers
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Dominick

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Tan

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Jeff G.

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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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