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I've got a 1999 7.4 Mercruiser MPI engine, it is running
Hi,I've got a 1999 7.4 Mercruiser MPI engine, it is running perfectly when its not in gear and the timing advance showing is 30 degrees of advance at 3000 rpm which I believe is correct. When under lo… read more
Jason
Jason
Marine Mechanic
19,587 satisfied customers
I have a mercruiser 7.4 (454) bravo 3. when I put it in gear
I have a mercruiser 7.4 (454) bravo 3. when I put it in gear it dies most of or 1/2 the time. the tps reads .27. … read more
Jason
Jason
Marine Mechanic
19,587 satisfied customers
Mercruiser 2010 350 Mag MPI Impeller went out, engine self
Mercruiser 2010 350 Mag MPI Impeller went out, engine self limited speed and then shut down at around 200F. Towed to dock. Replaced Impeller Engine seemed to run fine the next few outings, but not 100… read more
Jason
Jason
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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
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I have a 2005 Mercruiser 496 mag and the issue im having is
I have a 2005 Mercruiser 496 mag and the issue im having is that when I bring the throttle back to neutral the motor stalls, just above idle the motor surges and overall idles rough. All of the plugs … read more
Jason
Jason
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Hi Jason Further to our correspondence on the non performing
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Charles
Charles
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5,453 satisfied customers
Hi I Have a problem with a Mercruiser 5.0 Bravo EFI engine,
Hi I Have a problem with a Mercruiser 5.0 Bravo EFI engine, It will not rev above 3200 rpm under load. Engine details: 5.0 Bravo MY 2004 (October) Serial No: OWO68025. First fault was no fuel pressure… read more
Jason
Jason
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I have a 2003 5.0 MPI Mercruiser. I put took it from a dual
I have a 2003 5.0 MPI Mercruiser. I took it from a dual motor bravo boat and put it in 96 sea ray alpha one gen 2. I got a used ECM from a mercruiser shop in NJ. The new computer was for an alpha driv… read more
Jason
Jason
Marine Mechanic
19,587 satisfied customers
Engine # ***** 654200 Type; Mercruiser 454 MAG mpi Horizon Build
Engine # ***** 654200 Type; Mercruiser 454 MAG mpi Horizon Build date; 2000 or 2001 Problem details; 2010: First failed to start at fuel dock 3 years ago about the second day the NEW engine was restar… read more
capt ron 1959
capt ron 1959
Owner/Marine Mechanic
Vocational, Technical or Trade Scho
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have four winns sundowner series with 7.4 volvo penta i/o can
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Jason
Jason
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I have a Year 2000 5.0 GM TBI Volvo Penta that will not idle.
I have a Year 2000 5.0 GM TBI Volvo Penta that will not idle. if you start it you have to advance the throttle to make the engine run at 3000 RPM. Anything less it will sputter and drop to an idle and… read more
Jason
Jason
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Would a faulty IAC motor cause 2 burnt (melted) pistons in
Would a faulty IAC motor cause 2 burnt (melted) pistons in my new Mercruiser remanufactured 8.1 Horizon inboards? I also noticed that when I have my engine in neutral and advance the throttle it will … read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
I have a early 90s 5.7 mercruiser mpi that has a MEFI3 delphi
I have a early 90's 5.7 mercruiser mpi that has a MEFI3 delphi computer on it.The boat has about 550 hours and has been running well. I ran it for 5 hours last Dec and added fuel conditioner to the fu… read more
Tech Tom
Tech Tom
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Associate Degree
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The RPMs will not remain constant on my 97 Mercruiser 7.4
The RPM's will not remain constant on my 97 Mercruiser 7.4 MPI. There are only 50 hrs on this rebuilt motor with most parts sensors new. Code reader shows no errors and all values (pressure, voltage, … read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
My 99 mercruiser 7.4 nous is "hunting" and there is a very
My 99 mercruiser 7.4 nous is "hunting" and there is a very loud sucking noise from the flame arrester when its happening. It was originally only happening when coming down from a nice full throttle cr… read more
orcamarine
orcamarine
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I have a 1998 Crownline 268 with a 1998 7.4 MPI (Serial # XXXXX)
I have a 1998 Crownline 268 with a 1998 7.4 MPI (Serial # XXXXX) and Bravo 3 outdrive (22P prop). I recently installed the engine which I received used. The old engine was a carbureted 7.4 that the oi… read more
Jason
Jason
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Hi Larry,.I have a new q for an old problem that went away
Hi Larry,.I have a new q? for an old problem that went away and seems to be returning,.Yamaha 115 4stroke 2002,.starboard engine; Engine services done were full HP fuel sys cleanup,.new LP fuel pump,.… read more
Larry B.
Larry B.
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High School or GED
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Is there any way to extract codes from a 2004 Mercury 115 without
Is there any way to extract codes from a 2004 Mercury 115 without the factory software and laptop. Also, is it possible to get it to update its fuel map via an O2 sensor without the laptop driven soft… read more
ROCKET
ROCKET
MASTER CERTIFIED TECH
Vocational, Technical or Trade Scho
426 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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