1994 johnson 200 another problem

[jeremyeasen]

Many more weekends like these and I'll be buying a Yamaha, but lets see if I can keep it going awhile longer. Waterpump, stats, rectifier are all new, and the heads inside are clean. Also I have removed the ball bearing check valve at the tank outlet. We ran 15 miles out, trolled at 6 knots for 2 hours, and everything was great. I got back up to plane at about 4800 rpms heading in and the overheat alarm went off. My gauge, which I've found with infrared to be accurate, says 145 deg. I took off cowling, block wasn't hot. I disconnected both overheat sensors in block but alarm was continuous after backing off throttle and restarting. VRO is disconnected at oil tank and pump. I decided I hate this motor so I continued home anyhow. Then it was acting as if it had a fuel restriction, loss of throttle and getting worse. We made it in slow and steady. It would run high speed fine for awhile and then sputter to 2000. It was completely intermittent. Two questions to start...will the fuel rest. sensor go off at all with the motor off and ignition on? Two...all filters and line are new in the boat. If my pickup is getting clogged in the tank, what do the pros do about cleaning it out or replacing a pickup when its welded onto the top of the tank? If its a boat problem my new yamaha wont do me any good. Will a bad power pack create symptoms similar to fuel deprivation? that's one easy fix that I could do. would that explain the strange alarm buzzing? thank you in advance for everyone's help? Maybe one day I'll have an easy question

 

[seahorse5]

Re: 1994 johnson 200 another problem

What make and number spark plugs are you using in the motor?<br /><br />Did you disconnect the fuel restriction sender to see if the alarm stopped?<br /><br />If the motor was overheating and the alarm came on, then the motor should have gone to 2500 rpm and shake and shudder at that rpm, until you slowed it down some.

 

[jeremyeasen]

Re: 1994 johnson 200 another problem

Seahorse,<br />I didn't disconnect fuel rest. sender. It appears to be held in place with a small screw and I was out 13 miles when this happened again. It is under the fuel pump correct? I just checked the plugs...QL78YC. According to clymers this is not correct. I've never checked to see if they were correct because a trusted mechanic tuned it up last. What is everyone else's opinion of these plugs? The SLOW did not come on, it was acting as if it had a fuel restriction, however the alarm did not reset after turning off the ignition. It only does this after idling for several hours, and i take off to head back home. I'm going to start with the basics and re-re-check the fuel system from the tank. The ball seemed softer at higher speed..its usually rock hard and it still is rock hard at lower speeds. What would these plugs do to the motor? are they acceptable or should i replace with the QL77JC4 like clymer's says?

 

[TwoBallScrewBall]

Re: 1994 johnson 200 another problem

my 1997 evinrude 200 uses those plugs, as does my dad's 2001 johnson 115. I think they're right. (QL78YC)<br /><br />You sure the SLOW system wasn't kicking in? That's exactly what happens, the motor becomes restricted to about 2000 rpm just like you said happened...<br /><br />good luck.

 

[jeremyeasen]

Re: 1994 johnson 200 another problem

Now I'm starting to wonder if it thinks it is overheating although it isn't. It doesnt fall to 2000rpms by itself quickly. It starts to sputter and fall from 5000 to 4000 and then I have brought it down to idle. It only does this after extended idling and runs fine on the way offshore. It happens on the way back. It is not overheating. I can keep my hand on all parts of the block, it idles at 135, runs at 145. I just emptied my fuel/water separator and found significant crud, but no water. The filter inside the motor cowling is perfectly clean. I guess my main question is...Wouldn't the SLOW feature and the alarm be disabled after I disconnect the tan leads from the cylinder head? because the alarm was steady with key on, motor off, and both tan leads disconnected. I'm by no means an outboard mechanic but I've picked up quite a bit here. Could this be a power pack problem? Does the power pack kick in the SLOW functions?

 

[jeremyeasen]

Re: 1994 johnson 200 another problem

^

 

[Dhadley]

Re: 1994 johnson 200 another problem

I would say its not an overheat. Like you said -- it isnt going into SLOW. And the horn continues to sound when the head sensors are unhooked. So now we're back to Seahorse's idea of it being a fuel restriction. <br /><br />To me, finding crud in the filter is a good clue.

 

[jeremyeasen]

Re: 1994 johnson 200 another problem

If there is a restriction I'll find it. I've found outboard problems are a game of narrowing it down, at least for us novices. Assuming its starved for gas, why do you think the alarm would continue even after a shut down and only ignition on? Is the restriction alarm set off by a vacuum (or lack thereof) that may be telling the sensor to keep going off? thank you again

 

[Dhadley]

Re: 1994 johnson 200 another problem

Could be. I'd ahve a tech check the pressure and vacuume on the pump. If it has unusual readings that would be a clue as to where to look. If it happens again, disconnect the fuel restriction sensor wire. I hate to see you keep doing this because without the oil injection youre possibly running the cylinders dry of oil. Not good.<br /><br />Is the oil injection pump wire harness undone?

 

[jeremyeasen]

Re: 1994 johnson 200 another problem

Yes, both the VRO harness and the oil tank are unplugged. As far as I know the only sensors still connected to the alarm system are the two temp and the fuel restriction. i wish it would act up in a short trip. It seems to only act up after 2 hours or so of trolling. New filter today and a long weekend ahead of trials. Am I correct that the fuel restriction sensor wire is held in place with a small screw under the fuel pump? since its only happened 10 miles out, i havent really had the ability to reach out to the motor on the bracket to disconnect the fuel. is there an easier place to unplug it? thanks...keep up the help guys!

 

[jeremyeasen]

Re: 1994 johnson 200 another problem

^