SeaHarley
New Member
- Oct 12, 2006
- 370
- Boat Info
- 1998, 3870 Cruisers Yacht
SOLD: 1999, 310DA Sea Ray
- Engines
- 7.4, 454 MPI Horizons, in 3870 Cruisers
(310DA Sea Ray was 5.7, 350 MPI Mag)
Anybody had an issue with an engine RPM’s fluctuating over 3000 RPM?
I’ve been experiencing a problem this year with keeping the engines synced and looking for some ideas on a resolution. Bringing both engines up evenly the sync indicator is centered up to around 3,200 – 3400 rpm, then the port engine starts to drop 200 – 400 rpm and fluctuates up and down (mostly down).
The problem at first could be corrected by “jerking” the throttle up then down allthoug this method of correction is no longer working. The reduced rpm can also be recognized audibly so I have to assume it is not a faulty Sync indicator.
Fuel filters were changed at the beginning of the season.
Anyone have similar problems / solutions?
Thanks
Yes, my stbd eng was varying just like you described.
I replaced the MAP sensor, took 5 min.,
Has not done it again since then.
I got an aftermarket MAP by Wells at Salvo Auto Parts store for $40. Cheaper than a merc. product.
Works fine now.
Good luck.
Lee