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I have a boat with a 2003 Mercruiser 6.2L MPI. It has gotten…

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I have a boat with...
I have a boat with a 2003 Mercruiser 6.2L MPI. It has gotten progressively harder to start after sitting all week, a few months ago it just took 2-3 times to get it started, then I had to put the throttle all the way down (assumed it was flooded) to get
it started, now won't start at all. Took off the plugs and they were fouled, replaced plugs and starts OK now (still a little hard to start). When it was starting it would start OK after that first initial hard start for the rest of the weekend. Fuel pressure
holds steady for 30+ minutes when I tested it. Not sure what it could be?
Submitted: 3 years ago.Category: Boat
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Answered in 2 days by:
6/19/2015
Marine Mechanic: Charles, Marine Mechanic replied 3 years ago
Charles
Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 4,894
Experience: US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
Verified
Check to make sure that the IAC is not sticking on the engine. This is what allows the extra air into the intake for idle and start up. If you have a scanner, you can watch the function of it while the engine is running.
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Customer reply replied 3 years ago
The IAC is functioning normally, I was able to check that last night.
Marine Mechanic: Charles, Marine Mechanic replied 3 years ago
What is the fuel pressure holding at?Does the air intake sound different when the engine is running?
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Customer reply replied 3 years ago
Air intake sounds normal. Fuel pressure was around 30psi.
Marine Mechanic: Charles, Marine Mechanic replied 3 years ago
How does the air breather look? Would the engine start easier with it off?
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Customer reply replied 3 years ago
I tried with the breather off, still had the same issue with starting.
Marine Mechanic: Charles, Marine Mechanic replied 3 years ago
Are the plugs still getting fouled when you are trying to start the engine?
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Customer reply replied 3 years ago
Yeah, I put new plugs in and it got it started (although still was a challenge). Took the plugs out after 2 runs and they look rough again.
Marine Mechanic: Charles, Marine Mechanic replied 3 years ago
How did you check the IAC?
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