2.4L 200 merc acceleration issue

jamesbalog · #1 05-11-2018, 12:34 PM

2.4 200 merc.

the problem im having is very inconsistent. Sometimes the motor will run good all day. sometimes the problem will happen 1 in 5 times sometimes almost every time.

The motor will bog and sound and feel like it is only running on a few cylinders. It will do this until it either A dies or B just takes off out of no where and runs fine.

It has new plugs, compression is good, spark was good when checked.

if anyone has some advice as to what to look at i would greatly appreciate it.

I would normally just take this to a shop to get looked at but i have 3 tournaments in the next 4 weeks and really really need the boat at home.

THEFERMANATOR · #2 05-11-2018, 09:44 PM

On those engines the stator has 2 sides iirc. A slow speed and high speed winding. When the stator starts to fail, it will cut out when they switch over, and do what you describe. Bad switch boxes will also do it.

jvitiel · #3 05-12-2018, 04:06 AM

I have a '95 2.5L 200hp EFI Merc. It had a similar issue and it turned out to be a switch pack. The stator was replaced a few years before I got it for unknown reasons and per the mechanic, a bad stator will stress the switch packs so they should be replaced at the same time. Mine weren't (until I did them).

jamesbalog · #4 05-12-2018, 05:41 AM

Thanks guys. I had the switch boxes and the stator as well as pretty much everything else electrical changed 4 years ago. I was hoping this issue was something stupid but i think ive already checked all the dumb things.

Now to figure out if i can swap these parts out myself

thanks again

jamesbalog · #5 05-12-2018, 05:44 AM

I also forgot to mention the tach will intermittently not work, this doesnt always Correlate with the other issue though

phatdaddy · #6 05-12-2018, 08:58 AM

I was about to ask about the tach, usually means stator. Do you have a volt gauge or voltage readout on your gps.

When they were replaced, was it with OEM or look-a-likes. I think the sierra switchboxes are ok, heard mixed reviews on the stators.

Also might want to get a merc manual and do a link.n.sync. Probably Will not help, but will eliminate some things.

jamesbalog · #7 05-12-2018, 09:58 AM

Quote:

Originally Posted by phatdaddy

I was about to ask about the tach, usually means stator. Do you have a volt gauge or voltage readout on your gps.

When they were replaced, was it with OEM or look-a-likes. I think the sierra switchboxes are ok, heard mixed reviews on the stators.

Also might want to get a merc manual and do a link.n.sync. Probably Will not help, but will eliminate some things.

I do have a volt meter, and I dont think Ive ever looked at it when the problems have been occurring. I have noticed some higher than normal readings while running though in the past.

steplift20 · #8 05-12-2018, 10:34 PM

I had a problem like yours years ago, I would be out and the motor was running fine than all of a sudden the oil alarm would go off and o would lose 3 plugs It turned out to be one switch box that was also hooked to the low oil alarm, changed the switch box and problem solved Also it could be the stator . If you are lucky enought to run the motor on dry land and it happens I bet half your ignition is not firing but you can only check it while it's happening Good luck and the y
Tach issue could be cause by a bad rectifier The big guns Hopefully will give your there thoughts soon

phatdaddy · #9 05-13-2018, 08:11 AM

There are a lot of expensive variables in this equation. The merc manual has some very good instructions to troubleshooting. But, before i run down the electronic rabbit hole, i would Try running it on a seperate fuel source. Fuel pump could do as u describe also. When it stalls , is primer bulb full or collapsed?

The tach issue is a good indicator, but might be seperate issue.

Not trying to muddy the water, but there are a still a few unknowns. U know your boat better than anybody, its just as important to find out what its not as what it is.

jamesbalog · #10 05-13-2018, 11:31 AM

Quote:

Originally Posted by phatdaddy

There are a lot of expensive variables in this equation. The merc manual has some very good instructions to troubleshooting. But, before i run down the electronic rabbit hole, i would Try running it on a seperate fuel source. Fuel pump could do as u describe also. When it stalls , is primer bulb full or collapsed?

The tach issue is a good indicator, but might be seperate issue.

Not trying to muddy the water, but there are a still a few unknowns. U know your boat better than anybody, its just as important to find out what its not as what it is.

Im going fishing tomorrow. Ill bring a 6 gallon tank along.

I also swapped out the water/fuel separator and put a back up fuel line and primer bulb on just to eliminate that.

another thing i forgot to mention is when this happens if i pop her out of gear and give her some throttle it will solve the problem, at least until the motor is turned off again