Mercury 150 HP EFI Questions

Ahmed3y

Hi i ned to no the timing of 150HP EFI 2010

Chris M.3y

I have a 1999 mercury 150 EFI it’s darts and I was good but when you put it in gear to takeoff it only goes up to 3200 RPMs and smokes real bad. You can put it in neutral rib it up until 6500 RPMs, it will fluctuate and then once it stops fluctuating will run as normal. Any idea what’s going on?

Don Karl4y

What year did mercury go to EFI on the 150 hp motor?

Gordon S.4y

2005 Mercury 150 EFI dies at idle

R.green4y

Is their a fuse on the engine (mercury 2013 4 stroke EFI ) that would cause the engine not to crank?

Matthew H.4y

Im looking at a second hand boat with a1999 mercuryefi saltwater series motor what issues should I be looking for

Knockout5y

The lower two injectors won't spray...I hooked up three different computers and still the same problem... The wiring all checks out... If I plug into the injectors they don't light. Any ideas?

rodolfo s.6y

what is a good cylinder compression on a1996 150 efi 2 stroke outboard motor?

FishoBen 6y

Hi Rodolfo I can't recall the exact numbers on the EFI 150 but i currently own a Optimax 175 direct injected two-stroke with 190hrs and it has 130psi across all cylinders. Its professional maintained by a licensed outboard mechanic.

Hope this helps.

Beccie M.6y

I have this motor , love it! Ready to sell it with an 18' Ducksworth Advantage. People keep asking me the hours. How do I find the hours? Rebecca, Kuna, Id.

Lui 6y

Hi Beccie, well if you don’t have an hour meter fitted near the instrument area then you can’t really know, i have heard of dealers being able to check hours when plugged up to their computer at the workshop but I’m not sure if that’s true.

A genuine buyer who is interested may do a compression test on the cylinders to check the engines health.

Best of luck with the sale!

Cheers, Lui

FishoBen 6y

Thats correct Lui, workshop computer diagnosis will recall the hours logged on the outboards ECU.

cheers Ben

Ross M.6y

Rossco ...I have a Merc 2 stroke when out at sea i am traveling at 3000 rpm it will drop down to 2000 rpm then after a while it will back to 3000 rpm on it own can some one help me THANK YOU

Lui 6y

Hi Rossco, I’m guessing that your engine would be an older model? Do you know what year it is? Sounds like that issue is something fuel supply related... blocked fuel filter, squashed fuel line, hole in fuel line getting air? Is your carby or efi ?

Regards, Lui

Ross M. 6y

Hi Lui yes its a efi 2002 model. Thanks ..Ross

Jimmy R. 5y

Stator coil........

Wayne7y

About to buy a boat with a 150efi 2st merc 2000 model done 290hrs has been serviced regularly.just would like to no what these motors are like are there any major problems etc cheers wayne

Wayne7y

About to buy a boat with a 150efi 2st merc 2000 model done 290hrs has been serviced regularly.just would like to no what these motors are like are there any major problems etc cheers wayne

Lui 7y

They are strong motors, 18 yr old now though, I’d definitely recommend you check the compression on all 6 cyls & make sure it’s still all right...also open oil drain plug on the gearbox at the bottom with large flat screwdriver & make sure it’s not creamy, also if you buy it change the water impeller & you’ll be good to go!

All the best mate!

GS500F Rider 7y

As above, really good outboards with a good history behind them

FishoBen 7y

Hi Wayne agree with comments above BUT also have the thermostats checked or replaced on your next service. Its not a direct problem for the Merc 150hp but it will show you if its been flushed out on a regular basis, they should be clean and free of salt build up or corrosion. Change the water impeller during normal service intervals too. 290hrs is barely run in, cheers.