Force 150 rough low RPM

[gunner_mn]

I have a 1989 Force 150 H.P. on a 17 ft bass boat and it runs great when it's at 1/2 or higher throttle but below that it runs really rough. Vibrates and kinda jerks.

It also seems to have a starting problem. I have to give it quite a bit of throttle to get it started and once it does start and I try to put it in gear it dies unless you very quickly give it enough gas. It likes to stick in gear as well; making starting even more of a pain.

I would appreciate any help or suggestions anyone has here. Thanks.

 

[jerryjerry05]

Re: Force 150 rough low RPM

First do a compression test.Then a spark test.Then check the fuel pumps/2
diaphrams.
Check for water in the gas.Ethanol makes older hoses weak and can cause problems,J

 

[gunner_mn]

Re: Force 150 rough low RPM

Thanks I'll check that this weekend as the boat is at my cabin. Any idea why it sticks in gear? I was thinking it needed a new control box/throttle control box thing but I have no idea really.

 

[gunner_mn]

Re: Force 150 rough low RPM

I finally got around to doing a spark test and I the #2 cylinder has no spark. The plugs are new so what could be causing this?

 

[jerryjerry05]

Re: Force 150 rough low RPM

Switch the coils around and see if the no spark follows the coil or stays with the pack.Did you check the diaphrams? J

 

[gunner_mn]

Re: Force 150 rough low RPM

I switched the #1 and #2 coils around and i was able to get spark on #2. So bad coil then? And I replaced both diaphragms on the fuel pumps a couple weeks ago.

 

[jason32038]

Re: Force 150 rough low RPM

CHeck for loose wires first you might save yourself some money.