purplehayes
Member
- Apr 17, 2010
- 76
- Boat Info
- 290 Amberjack 2002, Lowrance HDS7 and HDS8 networked with BR24 and Standard Horizon GX2150
- Engines
- Twin 350 IB Merccruiser
Hey Gurus....
I haven’t posted in some time... but I need some guidance.
My Port engine is running really rich, there is a strong smell of fuel at idle and residual streaks coming out in the exhaust. (When I start the boat at the dock if I idle it for a while there a build up of oily streaks on the top of the water starts to appear). Not oil though I dont think, I am assuming it is fuel. The engine also does not start well any more. Normally the engine cranks over say three times and then vroom away it goes but this one cranks and cranks then slowly seems to take a spark... Even harder to start it when it is hot. Often if it is the first cold start it starts almost immediately instead of turn turn turn... slow glow... it starts 1/2 way through the first turn
What has been done with it directly for this or indirectly:
Oil Change, Filters and Computer Error code test (all fine)
Changed - Cap and Rotor, TMAP sensor, PCV valve
Initially I put on new IAC valves but ended up cleaning the old ones as the idle became too high with the new ones (not Merc) so IAC has been checked and sorted.
After I did the above I thought it seemed like it was ok for a bit... then I washed down the engine a bit (carefully) and the problem returned. So either it was something that I did and then I messed it up or there is a different issue that I am not aware of. Other searches lead me to believe that maybe my TMAP sensor is toast again but not sure why the new one would drop off line like that. I am currently away from the boat for a week but will try to switch the sensor from the starboard engine and see if that fixes it and if so then know what is what. I have also seen some discussion about vacum lines and fuel pressure return lines or something... but if that is the case then I need some guidance on that as well. Reasonably mechanically aware but I dont spend enough time with the engines on my own to really be able to run with it. I will look through the manuals for the lines and see if I can get a plan.
So ideas and guidance on where to start please.
I haven’t posted in some time... but I need some guidance.
My Port engine is running really rich, there is a strong smell of fuel at idle and residual streaks coming out in the exhaust. (When I start the boat at the dock if I idle it for a while there a build up of oily streaks on the top of the water starts to appear). Not oil though I dont think, I am assuming it is fuel. The engine also does not start well any more. Normally the engine cranks over say three times and then vroom away it goes but this one cranks and cranks then slowly seems to take a spark... Even harder to start it when it is hot. Often if it is the first cold start it starts almost immediately instead of turn turn turn... slow glow... it starts 1/2 way through the first turn
What has been done with it directly for this or indirectly:
Oil Change, Filters and Computer Error code test (all fine)
Changed - Cap and Rotor, TMAP sensor, PCV valve
Initially I put on new IAC valves but ended up cleaning the old ones as the idle became too high with the new ones (not Merc) so IAC has been checked and sorted.
After I did the above I thought it seemed like it was ok for a bit... then I washed down the engine a bit (carefully) and the problem returned. So either it was something that I did and then I messed it up or there is a different issue that I am not aware of. Other searches lead me to believe that maybe my TMAP sensor is toast again but not sure why the new one would drop off line like that. I am currently away from the boat for a week but will try to switch the sensor from the starboard engine and see if that fixes it and if so then know what is what. I have also seen some discussion about vacum lines and fuel pressure return lines or something... but if that is the case then I need some guidance on that as well. Reasonably mechanically aware but I dont spend enough time with the engines on my own to really be able to run with it. I will look through the manuals for the lines and see if I can get a plan.
So ideas and guidance on where to start please.