Global announcements
No global announcements
-
Latest Posts
-
Mercruiser 7.4 MPI - 3,200 Max RPM, High Fuel Consumption
- Posted by: jmagrann » May 16th, 2016, 8:30 pm
- Forum: Gas Engines/Transmissions
Greetings,
I have a 1998 Carver 400 CMY with twin Mercruiser 7.4 MPI engines, MEFI-2. I've had the boat for about 6 months. Starting with the sea trial, it was noted that the Starboard engine would not rev to much more than 3,200 RPM under load. The Port revs freely to about 4,400. Starboard will hit 4,400 in neutral. The engine isn't showing any fault codes, my engine guy is using Rinda's Diacom software. Props, standoff bearings, shafts all check out fine.
Engines were checked out, and the starboard did have one cylinder with low compression. I got a purchase allowance, and both engines have new manifolds and risers, and the starboard has new OEM heads. Compression good all around. 3,200 rpm max on Starboard is still there.
I also note that fuel consumption on the starboard engine is about 30% higher than the port engine. 3,200 is a good cruising speed, and I'd probably leave things along, but the fuel consumption is a problem.
Based on my internet research, it's likely a sensor issue. 3,200 is the 'safe' rpm for limp home mode, and there are a few posts out there with similar symptoms, but often end before a conclusion is published.
My question to the group: anyone heard of similar problems, and a resolution? I think the next step for me is to swap sensors between the engines, and see if the problem moves to Port, thereby identifying the problem sensor.
Thanks!
John Magrann
Views: 12340 • Comments: 16 • Write comments [ Back ]
-
- Last post
-
-
Last post
Re: Hello !
by Viper View the latest post
-
-
General Boating Discussion
This forum is for general discussion of all things Boating. If it's boating related and doesn't fit in another forum, post it here!Topics: 806, Posts: 6632 -
Last post
Re: Window Diagram/Blueprint
by km1125 View the latest post
-
-
-
Carver Yachts Forum - Model DiscussionThe is the forum to discuss general information regarding all Carver Yachts.Topics: 875, Posts: 5991
-
Last post
Re: Ceiling Vents in the Salo…
by bud37 View the latest post
-
-
-
Boating & Cruising LifesyleChat with fellow Carver owners about cruising destinations and more. Plan rendezvous, raft ups & get together's here.Topics: 165, Posts: 1882
-
Last post
Do you know the best parks in…
by Mariza View the latest post
-
-
- Last post
-
-
The Project CenterTopics: 450, Posts: 4091
-
Last post
Hydraulic Pump Question - Gar…
by NHCarver346 View the latest post
-
-
-
General Repairs & MaintenanceAnything related to the operation of your boat. Steering, Bilge Pumps, thru-hulls, bottom paint, etc.Topics: 1890, Posts: 13386
-
Last post
Re: Carver 396 salon window r…
by paulr View the latest post
-
-
-
Gas Engines/TransmissionsGAS engine, transmission and generator repair and maintenance discussion forum.Topics: 648, Posts: 6502
-
Last post
Re: Raw water pump fittings
by Kruggy88 View the latest post
-
-
-
Diesel Engines/TransmissionsDIESEL engine, transmission and generator repair and maintenance discussion forum.Topics: 182, Posts: 1176
-
Last post
Re: 2000 Carver 506 - 6CTA Cu…
by Sump99 View the latest post
-
-
-
Electronics & NavigationDiscussion of radars, GPS, autopilots, stereos and TV's. Also iPad and other mobile navigation devices.Topics: 244, Posts: 1700
-
Last post
Re: Transducer cable run
by bud37 View the latest post
-
-
-
AC/Heat, Plumbing & SanitationDiscussion of AC's, plumbing and sanitation related issues.Topics: 532, Posts: 4402
-
Last post
Re: 355 airconditioning ducti…
by buster53 View the latest post
-
-
-
ElectricalDiscussion of batteries, chargers, wiring, generators, distribution panels, battery switches, etc.Topics: 581, Posts: 5779
-
Last post
Re: Westerbeke gas generator
by MyPleasure View the latest post
-
-
- Last post
-
-
Carver Boats For SaleList your Carver Yacht for sale here. All listings are free for active form members! ALL ADS ARE FREE - USERS MUST HAVE AT LEAST 10 POSTS TO PLACE AN ADTopics: 122, Posts: 376
-
Last post
1985 Carver 3607 available
by Grafunkus View the latest post
-
-
-
Boat Parts For SaleUsed boat parts, used Carver boat parts, trailers, dinghies, outboards, props...everything but the boats they were attached to. ALL ADS ARE FREE - USERS MUST HAVE AT LEAST 10 POSTS TO PLACE AN ADTopics: 259, Posts: 1027
-
Last post
Bert Rod holders
by dianesmallings View the latest post
-
Who is online?
In total there are 713 users online :: 7 registered, 0 hidden and 706 guests
Newest members
- Username Joined
Mariza 05 May
Kwat21 03 May
Michael0972 01 May
GaryMac 30 Apr
Odyssey1! 30 Apr
rgodales 30 Apr
kuli_vt 29 Apr
BoogsNBohs 28 Apr
Statistics
- Totals
Total posts 68183
Total topics 8195
Total Announcements: 0
Total Stickies: 4
Total Attachments: 6673
Topics per day: 2
Posts per day: 14
Users per day: 2
Topics per user: 1
Posts per user: 6
Posts per topic: 8
Total members 11569
Our newest member Mariza
-
Birthdays
-
- No birthdays today
In the next 30 days
No members have a birthday within this period of time.
Sponsors