2002 150hp dies on throttle up and idle rough

fishcrazy · #1 (**permalink**) 07-22-2010, 05:51 PM

This is a new to me boat that I have done nothing to as of yet except for running some engine carb cleaner through an thaqt does not seem to be helping the situation. I am beginning to think I have a air leak in the fuel delivery lines somewhere. Or a cloged fuel filter. Should i clean the filter or replace it? The boat runs very good if you can get it up on plane at WOT. It's just getting there that is the problem. The inside of the engine is very clean and looks like new. I thought of trying to replace all the fuel line to the engine from the tank and maybe put in a fuel filter water separator unit while I am at it. That sound like a good idea? Im told I should check all the simple stuff first before taking on the carbs. Probably good advice. All of my issues are at low rpm. Any advice would be appreciated. It is a 2002 model.

Windstorm · #2 (**permalink**) 07-27-2010, 11:41 PM

Well I don't have a solution for you but will share the problem I am having. It may be related. I just bought my boat as well. Mine is in teh shop now and they have not isolated the problem. They say everything checks out ok. Mine is a 1998 150HP oceanrunner. When cold or not run in a few days, teh moter runs quite well, although tomight I thoght it's idle was somewhat rough. During initial use it will power up on plane and runs smooth and strong continuously. It's never given me a problem while running under high power. Then if I idle around for a fairly long period 5 to 15 minutes or shut the motor down and start it up agian after say 10 minutes, it runs extremely rough, also revs up and then sometimes coughs and dies. It also will not rev up or clean up with added throttle, so in that way similar to yours. If you find a fix please post. I'll do the same.

Bar79lee · #3 (**permalink**) 07-28-2010, 01:15 AM

I am having the same issue with my 225 venom! I bought the boat from an uncle and it started out fine then started getting worse about being able to take off each trip. I've been able to get it to go by either priming the bulb or pushing in my choke while throttling up. The bulb gets a little soft but not flat. I've had the carbs rebuilt and the idle adjusted at different times and each seemed to help for just a bit. The mech. Put the motor on a dyno and it ran great until I made a run across the lake then when I stopped and tried to take off agin it started bogging down. Some one please help, it's driving me crazy(well it's actually not driving me n e where till I figure it out). Thanks and good luck

Windstorm · #4 (**permalink**) 07-29-2010, 11:36 PM

Any ideas out there? The marina is not having any luck.

Bar79lee · #5 (**permalink**) 07-31-2010, 12:07 PM

It seems as if there are a million differnent issues that could cause this. I'm at work but the firstthing I'm going to try is to get a small portable fuel tank and hook directly to the motor and if that works, well it's the boat and if not it's the fuel pump or something else on the motor. If u guys try something, let me know please.

vantrow · #6 (**permalink**) 07-31-2010, 01:25 PM

This engine ran very well for one year, but now it will not continue to run. It starts well after it has set for a day or so, but then is seems to flood itself out or something like that. The rpms never stabilize and after about 3 min. of running it dies. Maybe a carburetor problem. My mechanic tells me a bad carburetor, but i didn't think carburetors go bad. Might just need a rebuild kit. After it starts and begins to die, i tried pressing in the choke. This kills the engine. In my case, this was a gradual fail. I could tell something was going bad. At first, i could run 10k yards or so before it died. I did notice a compressed fuel bulb, but a replacement fixed the problem(not sure if it was related) Next time out i made it roughly 5k yards, died. It would start but not stay running. Now i cant get it off the trailer. Same thing, will start, idle rough, rpm will not stabilize, and die. U guys have any advice?

Thanks in advance

Im not sure if we all have the same exact problem, but any advice would go along way at this point. I'm pretty sure my mechanic is also in the dark.

Bar79lee · #7 (**permalink**) 07-31-2010, 03:29 PM

I think the difference is that mine will run as long as I have some throttle on it but if I let off it will die. I can run all day long as long as I don't stop, if I stop and try to take off again, is where I have a problem. From what I've been reading, you should rebuild your carbs and your low and high speed jets. Also if your bulb was compressing, there is a fuel restriction either in your tank or the fuel lines. Good luck and hope this helps.

Windstorm · #8 (**permalink**) 08-01-2010, 12:57 AM

Took the boat out again today. Ran strong for a good 20 minute run. Shut down for some recreation for an hr. Started up again and as I started to just get up on plane the engine started breaking up. Took the engine cover off, and restarted and boat ran ok. Took another 20 minute run, fished a bit and restarted. The idle raced up when in neutral and under power the motor breaks up and has no [power. 5 mph if that. I'm ready to have the power pack changed. Just don't know what else to do at this point.

Already recreated the problem with a separate gas tank. Starting to think it is not fuel related and maybe in the engines computer.

Just hard to understnd how it can run so well and then so bad. Thats why it does not seem like it should be carbs.

vantrow · #9 (**permalink**) 08-08-2010, 04:07 PM

Not sure if this helps, but I found out that Johnson recalled their mechanical fuel pump. They told my mech. to replace it with an electric fuel pump and that this was the only solution. Mainly because of recall, and obsolete parts. This is after carb cleaning, throttle body replacement, fuel pump diaphram replacement. Soooo. took some time and money, but im now back to smooth sailing. See previous reply for my original problem.

Thanks and Good Luck!

Windstorm · #10 (**permalink**) 08-13-2010, 10:51 PM

Thanks for the update. My boat is still at the marina. Glad I still have my old boat, otherwise this summer would have been a total washout.

So far we've installed a sparate fuel tank no fix, changed out the power pack no fix. Changed the VRO pump no fix. Not sure what is next.

Symptoms are still same. Runs very strong when starting out and while under power. After shut off for 15 minutes after 15 seconds after restarting the engine breaks up and no power. Next morning runs fine.
It acts as if the chokle gets stuck on.
I'm also thinking it could be the cylinder cut out switch going bad?

When it gets fixed I'll post it.