Hoplite808
Well-Known Member
- Jan 11, 2022
- 507
- Boat Info
- 1996 Sea Ray 270 Sundancer
- Engines
- Mercruiser 7.4 LX MPI EFI (Gen. V)
Hello all, I have a 1996, made December 1995, Sea Ray 270 Sundancer fitted with a single engine that is a 7.4 LX MPI EFI with the Bravo 3 outdrive. (Engine serial OF764XXX)
The issue I am having right now is a bit of a rough idle and when put into gear it will not rev past 1300 RPM’s. If I open up the throttle all the way the engine really starts running bad and backfiring and shaking the whole boat. There is also a significant smell of unburned fuel coming from the exhaust.
I checked all the spark plugs and found no evidence of water or oil intrusion in any of the cylinders and compression on all 8 cylinders was within acceptable perimeters. The plugs did show evidence of having a very rich mixture however. The cap rotor and wires were new in August 2021 and still appear to be in good order.
I am thinking that it is perhaps the idle air controller and/or the throttle position sensor have gone bad. I do not have access to a computer that could plug into this motor to help diagnose the issue and I currently am unable to locate a mechanic to hire in my area that is available to fix the motor either.
For those more knowledgeable on this motor what are your thoughts on what could be causing my issue?
The issue I am having right now is a bit of a rough idle and when put into gear it will not rev past 1300 RPM’s. If I open up the throttle all the way the engine really starts running bad and backfiring and shaking the whole boat. There is also a significant smell of unburned fuel coming from the exhaust.
I checked all the spark plugs and found no evidence of water or oil intrusion in any of the cylinders and compression on all 8 cylinders was within acceptable perimeters. The plugs did show evidence of having a very rich mixture however. The cap rotor and wires were new in August 2021 and still appear to be in good order.
I am thinking that it is perhaps the idle air controller and/or the throttle position sensor have gone bad. I do not have access to a computer that could plug into this motor to help diagnose the issue and I currently am unable to locate a mechanic to hire in my area that is available to fix the motor either.
For those more knowledgeable on this motor what are your thoughts on what could be causing my issue?