OMC 2.3 Carburator Problem Need HELP

[Bulbash]

My carburetor butterfly valve on the throttle gets stuck open. If I fully open it with a finger and let it go it has enough spring force to close itself, however if you release it slowly it gets stuck at the last moment. If you use a throttle control you cannot make it go in closed position. I tried lubricating all moving parts there, but no luck.

On the first picture I circled some kind of a controller, I'm not sure what it does, but it feels like it has some resistance that might cause the issue.

Second picture shows the position of the stuck butterfly valve.

 

[HT32BSX115]

Re: OMC 2.3 Carburator Problem Need HELP

My carburetor butterfly valve on the throttle gets stuck open. If I fully open it with a finger and let it go it has enough spring force to close itself, however if you release it slowly it gets stuck at the last moment. If you use a throttle control you cannot make it go in closed position. I tried lubricating all moving parts there, but no luck.

On the first picture I circled some kind of a controller, I'm not sure what it does, but it feels like it has some resistance that might cause the issue.

Howdy,


That is your automatic choke control.

It uses electric power to heat a bimetallic element internally to move the choke butterfly.

It's either failed completely, lost it's power source or it's stuck internally/maladjusted.

Start by getting yourself a 12v test light and probe those connections for power when the key is ON.

If it has power, then investigate the failure in the heating element. If there's no power, you'll need to do some electrical troubleshooting to find where the power interruption is. (broken wire, fuse, circuit breaker, bad ground connection, etc)

Regards,


Rick


Let me also add, that it is normally adjusted to CLOSE the butterfly when unpowered (cold)............... it gets "HOT" when you turn the key on and slowly opens the choke after a period of time usually several minutes....... those 3 screws will give you access to the heating coil.

 

[Bulbash]

Re: OMC 2.3 Carburator Problem Need HELP

Thank you Rick. I will check that and report my findings...

 

[Bulbash]

Re: OMC 2.3 Carburator Problem Need HELP

Checked the wire going to the automatic choke control... With key in ON position (motor NOT running) there is 0V... even having one probe on battery negative terminal I still get 0V... Where this wire would be comming from? My engine was removed and reinstalled this winter during transom replacement so I guess it was disconnected somewhere? Any ideas?

 

[Bulbash]

Re: OMC 2.3 Carburator Problem Need HELP

Found this scheme in one of the manuals? What is the controller circled in red?

 

[HT32BSX115]

Re: OMC 2.3 Carburator Problem Need HELP

That's your alternator.

With key in ON position (motor NOT running) there is 0V.

Sometimes they wire the choke heater to the "hot" side of the coil. Your's (according to that schematic) is wired to the back of the alternator.

Now, having said that, the "cold" setting (with zero voltage) should default to the choke-butterfly CLOSED. HEAT is what slowly opens it. (presumably several min after running the engine)

Your original post indicated that it's stuck OPEN. If that's the case, then NO amount of heat/voltage will close it. It would just stay open all the time.

If you loosen the 3 screws on it you can actually adjust it yourself.

If you have a service manual, it should outline the adjustment process.

I have actually adjusted mine completely out of the picture and disconnected it. I only boat in warm weather. You really don't need much choke action if the engine is warm. I see more of them causing problems when they stay closed for too long.

This may or may not work for you depending on how cold it is when you start your engine, but I never use mine.

trace the wire back to your alternator, and fix or reconnect it. Then loosen those 3 screws and see if you can turn it one way or the other. You should be able to turn it from full choke (CLOSED) to full OPEN.

You can also take it apart and see if the bi-metallic "spring" is still intact and if the mechanism is stuck internally.

 

[Bulbash]

Re: OMC 2.3 Carburator Problem Need HELP

Is there any DIY's on rebuilding carbs?

 

[Bulbash]

Re: OMC 2.3 Carburator Problem Need HELP

I also suspect that there is a spring that might be seized or just dirty that puches butterfly valve into closed possition...

 

[HT32BSX115]

Re: OMC 2.3 Carburator Problem Need HELP

Is there any DIY's on rebuilding carbs?

I don't remember one here but I'll bet you can find one on Youtube.....

You can take the Auto-choke assy off and probably clean it up unless it's broken inside. You'll know when you get it apart.

 

[Bulbash]

Re: OMC 2.3 Carburator Problem Need HELP

You can take the Auto-choke assy off and probably clean it up

will look at it tommorow after work... Will post some pics...

Also, does the throttle cable only pulls throttle open or it also pushes it to closed position? Or butterfly valve is being open by thottle cable and closed by a spring? I noticed that on throttle control it is very stiff in the reverse. (My lower shift cable is installed and adjusted). Maybe there is some issue with a throttle cable?