94 Evinrude 112hp still shutting down? HELP

[tbull]

I simply do not know what to do any more, this thing still shuts rights down after going at WOT for more than 20 seconds. Everything has checked out, compression was good, spark was good, rebuilt fuel pump, rebuilt carbs, replacing fuel lines, replaced bulb and filter, new spark plugs. What the heck else could it be guys, this is getting to the point where its becoming to frustrating to even deal with anymore.................... When I mean shut down I mean comes to a stop, and dies. There is still fuel inside the glass in-line filter everytime, why is this engine doing this?

 

[tashasdaddy]

Re: 94 Evinrude 112hp still shutting down? HELP

have you check the spark immediately after it dies?

 

[tbull]

Re: 94 Evinrude 112hp still shutting down? HELP

no, but what would cause it to lose spark in the first place, stator, powerpack?

 

[SKEETR]

Re: 94 Evinrude 112hp still shutting down? HELP

Have you checked your tank for debris at the intake tube or a plugged vent?

 

[tbull]

Re: 94 Evinrude 112hp still shutting down? HELP

I have went over the fuel system numerous times, I actually replaced all of the vent lines all together, and the new fill line I installed actually required me to by another fill cap which also has a vent, the thing has 2 vents.

 

[tbull]

Re: 94 Evinrude 112hp still shutting down? HELP

Also forgot to mention pulled the pickup tube twice, no anti-syphon valve, just a screen. Actually removed the screen also so its just a straight tube, nothing even there to get hung up on. Getting plenty of fuel, even when it dies the in-line filter that is clear shows plenty of gas.

 

[clanton]

Re: 94 Evinrude 112hp still shutting down? HELP

You have to check the stator and pack when hot, use hair dryer to heat the parts, use meter with long wires, someone drives boat, you watch meter.

 

[wavrider]

Re: 94 Evinrude 112hp still shutting down? HELP

This is only at WOT?

I have seen this problem end up being wiring in the remote or from the ignition switch back to the engine. At WOT, with the boat bouncing around there is a bare wire touching ground or shorting to another wire.

It wil take some time and need a helpng had to ohm out the remote cable.

Also look at your kill wire going to the amplifier and make sure there is no corrosion on it.

This seems electrical in nature and not fuel related based on al the service you have allready performed.

 

[ezeke]

Re: 94 Evinrude 112hp still shutting down? HELP

If it is the kill wire, why don't you just disconnect it at the powerpack and see if the problem goes away. You will have to choke the motor to turn it off of course. I believe it is just a bullet connector on the black and yellow kill wire near the power pack.

 

[Robs88]

Re: 94 Evinrude 112hp still shutting down? HELP

Sounds like a power pack issue.

 

[tbull]

Re: 94 Evinrude 112hp still shutting down? HELP

This ignition stuff is all new to me but I sure am learning alot along the way. The pack has 2 seperate sets of black/yellow stripe wires, 2 of them are together and going to the stator it looks like, and there is 1 on the other side of the pack same color, I guess that is the kill wire? Also when you say "harness", I would imagine that is the cable that has multiple wires in it, that has a large red rubber connector on the engine? Largest connector there atleast. I can literally drop the boat in the water right off the trailer, head up river at WOT and immediatley bogs down after 20 seconds or so, wouldn't it take alot longer than that for these electrical components to heat up to the point the failure takes place? And if there is a short or wires touching inside the harness, am I going to have to un-tape the harnes itself and examine every wire, or how would I find the short using a meter? what settings and what am I looking for? As much as this is a pain in the behind, I really enjoy this for some crazy reason. I have looked all over the cincinnati, oh area for a Marine Mechanics school because it is something I really enjoy and would love to do for a living, no such schools around here though...

 

[wavrider]

Re: 94 Evinrude 112hp still shutting down? HELP

Yes with a meter, or disconnect the red connector on the harness, this will eliminate all the wiring in the cable and the remote, you will have to start the engine by jumping the terminal on the solenoid or using a set of cables and jumping the starter, will have to choke the engine to get it to shut off.

This symptom is only at WOT, if you are running 3/4 throttle or less the engine runs good? no problems at all?

You may want to recheck the float level on the carbs. There may be fuel in the fuel line and filter, dont mean it is making it into the fuel bowl.

Any little foreign object in the fuel line or carbs can and will mess up the fuel flow.

 

[tbull]

Re: 94 Evinrude 112hp still shutting down? HELP

Its has done it 3/4 throttle but very rare, put at full throttle it happens every time, very irregular idle is the only other problem and its hard to start. I have went over that fuel system with a fine tooth comb more than once, I am nearly 100% certain its not a fuel issue.

 

[jonesg]

Re: 94 Evinrude 112hp still shutting down? HELP

It seems you have eliminated fuel delivery.
I would try as tash suggests, check for spark as it dies, if it does it every time at WOT that should be simple to do.

The best way to get REAL expert help here is to follow their suggestions and report back, let them do the analysis rather than trying to control the process.

Fools ask the wise,
but the wise ask the experienced.

 

[tbull]

Re: 94 Evinrude 112hp still shutting down? HELP

Is there a way to test for spark after it heats up on muffs? I realize I cannot open this motor up to WOT on the flushing device, but maybe at just above idle speed, with a hair dryer? Heat up the coils and see if they still spark? I dont mean to sound like an idiot here, its just something I have read people doing on this site. I really want to perform the test I am being ask to perform, just curious if there is any other way to do it other than taking the boat to the river?

 

[wavrider]

Re: 94 Evinrude 112hp still shutting down? HELP

It seems you have eliminated fuel delivery.
I would try as tash suggests, check for spark as it dies, if it does it every time at WOT that should be simple to do.

The best way to get REAL expert help here is to follow their suggestions and report back, let them do the analysis rather than trying to control the process.

Fools ask the wise,
but the wise ask the experienced.

So true, there is a wealth of experience on this site and some of the experts have allready posted in this thread.

Start doing some tests, post the tests you are performomg and the results.

Here is some good links for info on tests to perform.
http://www.boatpartstore.com/page40.asp
http://www.boatpartstore.com/tips.asp

Scroll through the links and find your engine ignition system. Perform the tests and the results should come up with the problem.

If you do not have a repair manual it would be a good time to get one, they are worth their weight in gold when it comes to repairs and will answer most questions you may have. If you can find a factory repair manual it is better than aftermarket manual.

 

[tbull]

Re: 94 Evinrude 112hp still shutting down? HELP

THe only meter I have is a Fluke Multimeter, it is not possible to test all ingnition components without a DVA meter correct?

 

[wavrider]

Re: 94 Evinrude 112hp still shutting down? HELP

Correct, there are resistance measurements that can be taken.

 

[clanton]

Re: 94 Evinrude 112hp still shutting down? HELP

Set the meter on AC scale 300/400 volts, donot use auto ranging, connect red lead to hot side of ignition coil, black lead to ground, check at idle first the 3000 rpm. You will need to do each cylinder in turn, all cylinders should have close to same volts. If you are ok here, then in water full throttle test. If it is a pack problem you see the voltage drop. You should be able to do this in 30 minutes. You can times the voltage results by 4.414 and get close to manual spec. If voltage is up to spec all cylinders, the stator, powerpack, timer should be good.

 

[tbull]

Re: 94 Evinrude 112hp still shutting down? HELP

Thanks, as soon as I can find the help I will do that. here is what I was able to do yesterday by myself. Put it in a barrel of water with 4 spark testers, 1 on each cylinder, once again strong spark on all for at idle(no suprise), so I throttled it up to around 1500 Rpm's, no higher than that, while running I took a blow dryer and heated up the power pack just to see if I had any change, no change in spark whatsoever. But here is where this gets weird. I noticed when I turned the key to the on position, my fuel gauge would jump around like it had a short, intially we thought it was the main harness to the engine, but found out it was doing it when we moved the main power line that connects to the selonoid. What is even weirder, is that we could get the gauge to work, which it should not have because the I actually removed the ground to the sending unit when I was checking it just to see if the ground was loose, removed ground and the gauge still worked??? Also noticed all of the sudden I am getting no click on the electric primer when I push the key in??? Was this boat built on a cursed Indian burial ground or something???LOL....I think I have more electrical problems that I thought, I know the sending unit has to be getting another ground, but how? Any ideas on what is going on here? The only wires connected to that tank are on the sending unit, and right now the gauge still works with no ground?