engines dont go full throttle

[serpico1]

I recently had to have one of my shift cables replaced and then adjusted as the shift levers were not aligned. Now, after the mechanic completed that task, it seems my boat will not reach full power.

When I throttle up to go on plane, my engines are only reaching about 3300 rpm. (full throttle should be about 5400) if I throttle back to about the 3/4 position, the rpms stay the same, there is no change in rpms from 3/4 throttle to full throttle and the engines do not sound any different either. I also noticed that according to the sync meter, the port side engine is running faster then the starboard engine, from the 3/4 thru the full throttle position, the engines are in sync up until the 3/4 position.

I am assuming this is a simple cable adjustment issue, at least I hope it is. Prior to the shift cable being replaced. I did not notice this problem.
How do I correct this, do I adjust the throttle cables at the helm in the throttle control box or back at the engine?

 

[alldodge]

I think I would ask the shop what did they do to mess it up.

Otherwise for folks to help they will probably need more info. Is this cable throttle of by wire (digital).

 

[Bondo]

Ayuh,..... Is this a Dock boat,..?? not a trailer boat,..??

If so,... Clean the bottom, ya got too much sealife hangin' on for the free ride,....

 

[serpico1]

I think I would ask the shop what did they do to mess it up.

Otherwise for folks to help they will probably need more info. Is this cable throttle of by wire (digital).

Its a cable throttle/shift control. both the throttle and shift control are combined in one control arm, I have a port and starboard control arm

 

[serpico1]

Ayuh,..... Is this a Dock boat,..?? not a trailer boat,..??

If so,... Clean the bottom, ya got too much sealife hangin' on for the free ride,....

I had thought it might be a fouled bottom. But, since the engines are not accelerating or revving up after the 3/4 position, I thought it might be more of a cable issue. I had fouled bottoms before and the engines would rev up and the boat speed wouldn't increase. Here, the engine rev dosent increase at all after the 3/4 mark

 

[jerryjerry05]

Get the shop back out to fix the problem.
Really hard to diagnose a throttle problem on line.

 

[alldodge]

Since it's cables and it didn't do this until after one cable was replaced and the control handles adjusted, the issue sure seams to me to be caused by the mechanic. With the engines off, move each throttle full forward and see if the (carb or throttle body, don't know what you have) they are opening all the way. This can be determined by moving cables forward then remove the cable from (carb) and see if it can be moved further forward.

Just as a note, many have their cables adjusted to get the handles even, and most cases I have found mess up the works. Each engine has a slight different power curve then the other

 

[serpico1]

Well, yesterday, I checked the throttle cables and they both seem like they are good. I had a friend push the throttle lever forward as I watched the cable move on the engines. When the throttles were in WOT position, the throttle body on the engine was also in WOT position. So, the engines, not being able to get above, 3300 rpm, doesn't appear to be a throttle cable issue.

I did notice though, that when we had the boat out last week, the engines were pulling gas primarily from the port side tank, at least according to the gas gauge. we went out with just under a half tank in each side and when we returned, the starboard gas gauge didn't appear to have moved, but the port side was reading near empty.

I can isolate the tanks to see if that makes a difference. If not, maybe I will change out the fuel filters. But, usually the engine bogs down when they are clogged

 

[alldodge]

With both pulling from the same tank it could be the engines are unable to get enough fuel with the one line. Does it help to have them pull from both tanks?

 

[serpico1]

With both pulling from the same tank it could be the engines are unable to get enough fuel with the one line. Does it help to have them pull from both tanks?

The engines were set to pull from both tanks. But for some reason, they only seemed to pull mostly or totally from the port tank. So, this weekend, I'm going to switch the valves and isolate each tank so that the port engine only pulls from the port tank and same with the starboard side. See if that makes a difference

 

[Bondo]

Ayuh,.... Don't what ya got goin' on, But,....

I know the answer is in This list,....

 

[serpico1]

Ayuh,.... Don't what ya got goin' on, But,....

I know the answer is in This list,....

Thanks for the list. A few of the things on there are definitely not the problem. But, If the changing of the fuel filters, doesn't work, I will work my way down the list, cleaning out the intake . I have fuel injected engines. So I will also be using some Sea Foam to see if that cleans up any clogs. There is some growth on the bottom. But nothing out of the norm. We did have a few people on the boat on that day. But, not even close to the Max capacity.