mercruiser 350 I/o rpms stopping at 3000 when I usually get 4200 .

[jaxmerc]

I have not changed the prop .also the plugs and fuel filters were all done 6 months ago .and new ignition and new alternator and many more new stuff I just cant figure this out .please some one helppppp

 

[jaxmerc]

Re: mercruiser 350 I/o rpms stopping at 3000 when I usually get 4200 .

Also it was running fine this whole summer untill my last two times out

 

[Scott Danforth]

Re: mercruiser 350 I/o rpms stopping at 3000 when I usually get 4200 .

Welcome to Iboats.

make sure you read the stickies a the top of the forum. This may help

http://forums.iboats.com/mercruiser...ives/list-possible-causes-low-wot-295070.html

 

[Don S]

Re: mercruiser 350 I/o rpms stopping at 3000 when I usually get 4200 .

What has changed since it last ran right? Nothing but fuel? Check the fuel filter for water, and put a new one on (do not reuse a filter once removed)

Here is a list of possible causes of low WOT (Wide Open Throttle) rpm.

In no particular order

Engine Won't Reach Operating RPM. Check

1. Fuel condition. Type and Octane possibly old fuel
2. Propeller pitch or diameter, damaged blades
3. Restricted fuel pickup tube or anti siphon valve Fuel System Test
4. Crankcase oil volume, high oil level can cause aerated oil and lifter collapse
5. Marine growth on hull and outdrive
6. Wrong gear ratio in outdrive
7. Restricted carburetor air intake (clogged flame arrestor)
8. Restricted exhaust system (broken exhaust shutters/flappers) in engine transom shield or drive
9. Poor cylinder compression Compression Test
10. Carburetor defective, or wrong type.
11. Fuel pump pressure and vacuum
12. Boat overloaded, improperly loaded, or improperly trimmed.
13. Engine Overheating
14. Engine timing and ignition system operation
15. Remote control cables and linkage for proper travel to open throttle plates fully.

 

[jaxmerc]

Re: mercruiser 350 I/o rpms stopping at 3000 when I usually get 4200 .

Wow I love this website .thabks guys I just signed up ten minutes ago and learned alot...I was told that my carb was gonna need to be replaced in future so that sounds right ..I put a new ignition thing on engine last year I had mechsnic put on .also I did have a oil leak bad that same day the rpms went down but I put oil in .not to much but I dont see any leaks anymore .I think it came out of my dipstick sleeve .the mecanic last year told me that had a leak In it .also I checked the fuel filter for water and there was none.im so lost it sux .haha.first real boat and I didnt realize what an expensive hobby

 

[Scott Danforth]

Re: mercruiser 350 I/o rpms stopping at 3000 when I usually get 4200 .

if you have oil coming out your dipstick, you have something seriously wrong.

 

[dubs283]

Re: mercruiser 350 I/o rpms stopping at 3000 when I usually get 4200 .

.and new ignition

is the timing correct??

is the ignition advancing fully??

 

[jaxmerc]

Re: mercruiser 350 I/o rpms stopping at 3000 when I usually get 4200 .

is the timing correct??

is the ignition advancing fully??

What do u mean by that ?

 

[jaxmerc]

Re: mercruiser 350 I/o rpms stopping at 3000 when I usually get 4200 .

Well thats what this kid said but I havent found the leak yet