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I have a 1999 Mercury outboard 225 EFI. It will not idle but

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I have a 1999 Mercury...
I have a 1999 Mercury outboard 225 EFI. It will not idle but runs fine once you give it gas.
Submitted: 1 year ago.Category: Boat
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Answered in 10 minutes by:
6/13/2016
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago
Charles
Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 4,006
Experience: US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
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Hello, my name is***** will assist you.

Do you know what spark plugs are in the engine?

Have you already done any troubleshooting on your own yet?

Does the engine smoke more at idle?

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Customer reply replied 1 year ago
I have NGK plugs in it.It smokes more than the other engine.I changed all the fuel filters. It is very distinct working and not working. To start the motor I have to give it a little throttle. I can put it to idle and runs rough and then dies. If I give it gas after starting and get on plane the boat it will run perfect, when I go to idle it idles perfect for about 2 minutes and then runs rough again then dies. It doesn't seem like its loading up. It seems like a sensor is telling it something.I have a vast experience in big blocks and very little on outboards.
Customer reply replied 1 year ago
I was thinking maybe a MAP sensor?
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Thanks, ***** ***** have the serial number from one of the engines handy?

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Customer reply replied 1 year ago
OG842719
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Sorry for all the delays.. It is defiantly a Monday here.

The engine calls for Champion QL77CC spark plugs. It ill not run really well on NGK plugs for some reason.

Can you locate the square pulse pump on the engine, remove the two bolts that hold it to the block, and remove the outermost hose. Use the primer bulb to see if you get any fuel out of the front or rear covers on it.

Can you pull the plugs and do a reading on them? Is any darker or lighter than the others.?

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Customer reply replied 1 year ago
I will be able to do this tomorrow and let you know
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Sounds good. Talk to you then.

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Customer reply replied 1 year ago
I am going to put new plugs in it. What gap would you recommend?
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

0.035

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Customer reply replied 1 year ago
I changed the plugs on both motors. All 12 looked the same. The bad motor had champion and the good motor had NGK. Didnt get any fuel out of the covers. I took it apart and all the rubber was intact. The motor still runs rough. The RPM shows 1400 at idle but its hardly turning. I throttled it up and it ran rough until about 3000 rpm's
Customer reply replied 1 year ago
All the plugs were dark not light colored
Customer reply replied 1 year ago
Should I take a quick video of it running and send to you?
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Yes a video would be great. If you can post it to you tube or another file sharing site.

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Customer reply replied 1 year ago
You Tube
Bad merc motor 1
Bad Merc Motor2
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Can you post the link to those vids. There are literally thousands of Merc vids on YouTube. I cannot locate yours.

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Customer reply replied 1 year ago
https://youtu.be/25W5B_Xq8Ckhttps://youtu.be/jUuL3t-mRaI
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Can you take the pulse pump from the side of the block, remove the hose from the front plate leave the hoses connected to the center plate. then pump the primer bulb and see if you get any fuel from the elbow on the front or the hole out of the back.

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Customer reply replied 1 year ago
You've already asked me to do that and I didnt get any. I'll try again and confirm
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Sry, I read back and missed that.

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Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Take the flywheel cover off and make sure that the stater is not staying engaged.

Have you already done a compression test on this engine?

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Customer reply replied 1 year ago
took it off and pumped the ball. Nothing out of anywhere. You can hear the fuel going thru the pump
Customer reply replied 1 year ago
Whats next? Thanks for all your help
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Did you look at the starter to see if it is staying engaged?

Have you already done a compression test?

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Customer reply replied 1 year ago
What about a sensor? Map? Idle? Starter engaged, I don't get why that would make it run like it is No I haven't done a compression check. Top end has maybe 100 hours on it
Customer reply replied 1 year ago
Please advise on next step. Do you want me to do a compression check? Reed valve? It idles perfect after bringing off plane for the exact same amount of time. Compression would have bad idle all the time wouldn't it?
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

I heard some strange noises from it when it was running. That is why I was asking about the starter and the compression. A failed MAP would also trigger an alarm. You can unplug it and see of the engine runs any differently.

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