E200TXEO acceleration problem

[Bruce San]

Intermittent problem now more frequent. Engine starts fine and accelerates fine when started from cold condition. Once warmed up and stopped for more than a few minutes the following problem develops: Engine starts right up and idles fine and will shift into gear and continue to idle. But once throttle is advanced engine sputters and dies. Each time it is restarted the throttle can be advanced a little farther before it dies until after about 6 or 8 tries and letting engine idle for a few minutes between tries it will finally takes off and run great.

Thoughts?

 

[Dhadley]

Re: E200TXEO acceleration problem

What octane fuel & how much ethenol? What spark plugs?

 

[Bruce San]

Re: E200TXEO acceleration problem

thanks Dale. 87 octane, less than 10% ethanol according to the pump, champion QL77JC4

 

[Dhadley]

Re: E200TXEO acceleration problem

Just for kicks look up under the flywheel and look at the outer magnets. Are they still evenly spaced? If you put slight pressure on them with a screwdriver can you move any one of them?

Good choice on fuel & plugs.

 

[Bruce San]

Re: E200TXEO acceleration problem

Sorry for the late response. Job got in the way.
The magnets seem to be stuck fine. Changed fuel filter and problem got a little better but didn't totally go away. Next time out (yesterday) problem much worse. Motor seemed to be smoking more than normal. Used 1.5 gallons oil to 15 gallons gas! Checked compression all seemed pretty good. High 120, low 114. Plugs wet with oil. I'm no expert but I think I got an over oiling problem. I'll bet that's making her run funny. Noticed oil seeping out of electronic module between epoxy and plastic case. I'm guessing there is a problem with either fuel pump or oil pump or both. Can they be re-built or do I have to buy new? thoughts?

Wife sold shop manual at garage sale. Ordered new one from Ken C this morning.

 

[Bruce San]

Re: E200TXEO acceleration problem

Looked up part #s for pump repair kit on BRP website. Two are listed: early production double seal 0434516 and late production single seal 0437753.
how do I tell which one I need?

 

[Bruce San]

Re: E200TXEO acceleration problem

disregard last post. My bad. those #s are for a lower unit re-seal. I intended to post sepatately.

 

[ezeke]

Re: E200TXEO acceleration problem

You can rebuild only the gasoline side of the VRO, VRO2 or OMS pumps. At a minimum, that would provide an excellent pre-mix pump.

The rebuild kits are available here: http://maxrules.com/fixomcvro.html

Scroll down to the word "ALL" in red.

 

[Bruce San]

Re: E200TXEO acceleration problem

Thanks Ezeke. The motor will run WOT so I don't think the fuel pump is necessarily the problem. I am having a difficult time understanding the spike in oil use. I ssume there is a problem with the oil side btu thought if it were to fail it would stop pumping oil not pump 4 times too much. Have you heard of this before?

 

[Dhadley]

Re: E200TXEO acceleration problem

The pump is designed to pump more oil if it senses a fuel restriction but probably not that much. There was a service bulletin (if I remember correctly) about over-oiling. And in some cases where the tank is higher than the pump, like on a pontoon or deck boat, there can be issues too. There are several tests in the service manual for checking the pump operation.

 

[ezeke]

Re: E200TXEO acceleration problem

Both sides of the pump will continue to pump whatever the calibration and supply allows, so that if the gasoline side has an obstruction, or if the gasoline side of the pump fails to function properly, the pump can flood the engine with oil.

You should have a vacuum switch near the fuel pump that generates a constant alarm warning if the obstruction is in the gasoline supply. If there is no constant alarm, the problem may be within the pump itself.

 

[Bruce San]

Re: E200TXEO acceleration problem

Thanks guys. I should have my manual in a couple days. I'll go through the pump tests and test the fuel restriction vacuum switch. I'd like to keep the OMs pump and tank set up. It has been very convenient and very reliable on this and a couple other motors I've owned. this is the first time I've had a problem with one. If the choice boils down to $400 to keep the set-up or $100 to go premix, I may have to go pre-mix.

Thanks again for your help and input.

 

[ezeke]

Re: E200TXEO acceleration problem

If you should decide to upgrade the system to the latest OMS, I would recommend that you get the pump through a reputable dealer who will continue to service the pump for the foreseeable future. The following thread will help you to understand the concern: http://continuouswave.com/ubb/Forum3/HTML/013127.html

 

[Bruce San]

Re: E200TXEO acceleration problem

Is VRO2 the same as OMS?

 

[ezeke]

Re: E200TXEO acceleration problem

The VRO2 was last installed on new motors through 1992. After that the OMS system was used. The primary difference is that the VRO pumps had a wide variation in gas/oil ratio, where the variation in ratio on the OMS pumps is quite small, averaging 60:1.

The concern with the VRO2 pump is that it is likely to be 16 years old and possibly 20. The 20 year old VRO2 pump on my 1988 looper is still functioning perfectly, but as a premix pump, considering one rebuild of the gasoline side.

 

[Bruce San]

Re: E200TXEO acceleration problem

thanks again Ezeke. My new OEM manual arrived today. Over the next couple days I'm going to replace the drive shaft seal that's leaking and go through the diagnostic steps on the OMS pump. The thing was definately over-oiling in a BIG way. I'll let Ya'll know what I find. Thanks to you too Dale. I'm a pretty fair shade tree mechanic but, I couldn't do this without you guys. And thanks to iboats for providing this forum.

 

[Bruce San]

Re: E200TXEO acceleration problem

If I were to go pre-mix, I plug the oil line at the pump, disconnect the two wire plug coming from the oil tank and disconnect the four wire plug coming from the pump. correct? Then pre-mix the fuel at 50 to 1. I have an 82 galllon tank so that would be 1.64 gallons oil to full tank. Then disconnect fuel supply line at pump and squeeze primer bulb until pre-mix comes out. Reconnect fuel supply line and it's ready to go. Right?

 

[ezeke]

Re: E200TXEO acceleration problem

That sounds good. Be sure to leave the vacuum switch in place and connected for the fuel obstruction warning. Also test the temperature warning wires at the cylinder heads by grounding the control end of the wires to make sure that the horn still sounds.

You may want to tape the harness plugs so that they will be in good shape if someone wants to reconnect or upgrade the system later.

 

[Bruce San]

Re: E200TXEO acceleration problem

Thanks Ezeke. OK, I tested the overheat leads at the heads and they both work. Constant beep at the helm. Can I test the fuel restriction sender the same way?

 

[ezeke]

Re: E200TXEO acceleration problem

Yes.