Interesting OMC engine problem

[yonipainting]

I have searched lots of discussions but did not find a problem like this.
I have 77 2.3l OMC and here is what happens.
Starts like a charm, idles good, responds to accelerator in idle - no problem-
When I put in in gear (forward or reverse), it goes only to about 800 to 900RPM and then chokes down if i press accelerator more. It backfires and dies. I can not push accelerator fast to "pass" the point - it dies also.
Nevertheless, if I just keep it running (in gear, in water)) at 800-900 RPM for about 5 min it suddenly goes up slowly and then I do not have any more problems for as long as I do not turn the engine off - then the story goes from the beginning!
One more thing, the engine does not warm up (stays along 120 even if I run it at 3000 RPM in idle for couple of minutes)) untill it goes over those 1000 RPM.

 

[Coors]

Re: Interesting OMC engine problem

A place to start.
http://forums.iboats.com/showthread.php?t=167561

 

[Don S]

Re: Interesting OMC engine problem

With the engine OFF, Check the accelerator pump and see if it is squirting fuel into the carb when the throttle is opened.
I would also check the dwell and timing.
Are you sure the engine isn't an 87? OMC didn't use the 2.3 in 77.

 

[yonipainting]

Re: Interesting OMC engine problem

OK, maybe it is 2.5 but is definitely 77
By the way, the tune up is done recently, and the problem just started yesterday and on a second run. Started out normally, went to a first fishing spot, and when I wanted to move it started acting like that.

 

[yonipainting]

Re: Interesting OMC engine problem

And yes, it is squirting fuel in carb when engine's off. It runs perfectly normaly with no load. Just does not warm up.

 

[Don S]

Re: Interesting OMC engine problem

OK, maybe it is 2.5 but is definitely 77

It makes a big difference, the 2.5 is a Chevy engine, and the 2.3 is a Ford.

It also sounds a lot like water in the fuel. Do you have a water seperating fuel filter.

 

[yonipainting]

Re: Interesting OMC engine problem

Yeah it is a Chevy. As far as the separating filter, I do not know if I have one (fairly new to this), but isn't it strange that everything works fine once the engine goes over 1000 RPM (after 5 min). If I do not have filter or it is faulty, how is it possible that "it works itself out" after that period of time?

 

[yonipainting]

Re: Interesting OMC engine problem

Anybody else, please?

 

[Dakota47]

Re: Interesting OMC engine problem

Maybe ya got some bad gas.

 

[Coors]

Re: Interesting OMC engine problem

Do the first answer to your question, then go from there.

 

[yonipainting]

Re: Interesting OMC engine problem

Sir yes Sir!
OK boss, I will try that and come back here with the results!!

 

[Coors]

Re: Interesting OMC engine problem

If a filter is not there, install one, and have spare ones. That is the first step
.

 

[Coors]

Re: Interesting OMC engine problem

Idle circuit in carb gummed up or has it been tuned lately?

 

[yonipainting]

Re: Interesting OMC engine problem

Thanks for posting guys, I will do all these things and see what happens. I had nothing but problems with this boat and it is driving me nuts by now. I would like to have one lake trip without problems.