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I have carbon plume at start up and the engine smells. My…

Second opinion] I have carbon...
Second opinion] I have carbon plume at start up and the engine smells richJA: Sometimes things that you think will be really complicated end up being easy to fix. The Marine Mechanic I'm going to connect you with knows all the tricks and shortcuts. Tell me a bit more about what's going on so the Marine Mechanic can help you best.Customer: My 6.2 Horizon Mercruiser is showing signs of carbon build up when it is at idle there is a wisp of blue smoke till it warms up and it smells like fuel, running rich, the starboard side motor uses more fuel than the port. both motors are the same age and same hours but the port motor has no carbon coming from exhaust and no blue smoke. I have changed the fuel regulator from one side to the other and it seems to have a better idle. just don't know where to look nextJA: Is there anything else important you think the Marine Mechanic should know?Customer: The port motor has a new IAC valve maybe the starboard needs one too
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Answered in 1 hour by:
3/17/2018
Matthew John
Matthew John, Marine Mechanic
Category: Boat
Satisfied Customers: 69
Experience: Marine Technician, Certified in MERCRUISER AND MERCURY OUTBOARDS (Current), EVINRUDE, SUZUKI, YAMAHA, HONDA.
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You can also try swapping the Temp Sensors (located on the port side of the thermostat housing) Starboard temp sensor may be stuck in range... Also have you tried a Fuel Pressure Test at Key-Up? If fuel pressure drops dramatically or does not maintain after initial key on, this may indicate a leaking injector. I would also check IAC filter in the throttle body OR on some models it's external to the throttle body. It's just a small white rectangle filter that will most probably have turned brown and black.

Regards,

Matt

Matthew John
Matthew John, Marine Mechanic
Category: Boat
Satisfied Customers: 69
Experience: Marine Technician, Certified in MERCRUISER AND MERCURY OUTBOARDS (Current), EVINRUDE, SUZUKI, YAMAHA, HONDA.
Verified
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Matthew John
Matthew John
Matthew John, Marine Mechanic
Category: Boat
Satisfied Customers: 69
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Experience: Marine Technician, Certified in MERCRUISER AND MERCURY OUTBOARDS (Current), EVINRUDE, SUZUKI, YAMAHA, HONDA.

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