Engine bogging down

[Blueraven]

Would it throw a code to the ECU and store it but not display it on the FI light until you ground PIN 37?

[macmac]

I think you have a bad gas problem too. If that bike winters in the cold, a dry place but cold that also heats in day, and you fi8nd the bike with condenced water often like I do, it may be you are making water in the tank.

There is a portion of fuel we can't use that stays lower in the tank, and is exactly where water would collect.

Thge 1600 is worse than the 1500, but a few beads of water in gas, which at times can reach the tank pick up, might well do this.

To see what I mean add a skim of water in a jar bottom, then add gas to about 1/4 full in the jar. Give that an hour to settle out, then tilt the jar easy, then sort of slurp the jar around.

You will see the water slurp around under the gas, and that is the idea I have. Only at rare times does the water make it to the pick up.

I have no idea if you could have lost a bottle seal in the tank, but in my time I have found more than one in gas tanks on bikes, cars and trucks. That little thin metalic bottle seal we poke a hole in.. I would think this isn't possible since there is a internal filter, but i can be wrong.

[cnc]

Originally Posted by Blueraven

Would it throw a code to the ECU and store it but not display it on the FI light until you ground PIN 37?

I'm not 100% sure as I have never had to deal with fault codes on the Nomad, only cars. Common sense tells me the FI should have come on to indicate a fault code has been stored. In any event it wouldn't hurt to check for fault codes. I have a feeling you won't find any, but it is one thing you can then cross off the list.
Just curious here and trying to get a feel for the problem. When did you get this bike, is it fairly new to you? How much mileage have you done so far this spring ? Was it acting up right from the first ride after storage?
Does the bike have an after market fuel processor?

[Blueraven]

The bike is fairly new to me. I have put about 3000Km on it since I have had it. I have done less than 1000Km so far this spring. I don't remember it acting up before I put it into storage. I could be wrong. I does have an aftermarket fuel processor in it. The FI light has not come on when it acts up. You could be very right with water in the tank. I have put Methol Hydrate in the gas last night so I am hoping this is going to help. If it still acts up, then I am going to pull the TANK again and open it up and clean it out.

[cnc]

It is hard to find a problem when it comes and goes.
The reason I kept suspecting water in the fuel is I went through that last year and my Nomad acted exactly as you describe. If you didn't get all the fuel out ie: turn the tank upside down and shake it out, then maybe like Mac says there is still some water in there siting in the bottom of the tank. Mine would also run fine and then hiccup a time or two shortly after filling as that helped mix up the water so it was suspended in the gas for a short time before setting to the bottom I presume.
At this point I would drive the bike and Keep adding isopropl ( I prefer this to methol hydrate base gas line antifreeze ) to the tank for a few tankfuls. Either it will cure it or the symptoms may get worse and it will be easier to diagnose.

[Blueraven]

Can you add TOO much Isopropyl alcohol ?

[ringadingh]

You should be able to add 4-6 ounces and be quite safe, even adding a lot more shouldn't harm anything but there is no benefit to adding that much all at once.

As I mentioned earlier I once had a loose coil wire that caused the bike to stumble sometimes, once I tightened the terminal Its never been an issue again.

[Blueraven]

Ok. Thanks for all you help. Will try the IPA and then pull the tank and really inspect the coils.

[Blueraven]

I added about 6 oz of the IPA. Took it for a ride tonight, about 40km, and it didn't do anything but perform great. I did run it almost dry (til the light came on). I put in 10Ltrs and it showed FULL. HMMMM. I see how you can go 100Kms with out the needle moving a inch.

One thing I have noticed that it vibrates a bit more than I am use to when it idles but I think that is normal.

I REALLY REALLY REALLY REALLY hope it is fixed now. PLEASE!!!!!

[macmac]

That seems better. I hope once the engine was at full warm you twisted the wick hard up a few times to get some real flow thru the injectors. You don't want crudy gas stalling in the injectors. Don't rev engines in neutral, it isn't good and isn't the same thing.

[Blueraven]

Well it did it only once going up a hill. I went up a few hills but it didn't do it. I think I am going to pull the tank and check the wiring. Something is suspicious.

[macmac]

I am not sure where the wire haness goes to get to the fuel pump, but there is a known problem with the harness at the bend at cly 2. The nyloock tie there has a release if it's still stock, so check it before you cut it. Then look at the side you can't see against the frame.

[cnc]

How about going over bumps or railway tracks, thats when I would expect a loose connection, or fraid wire etc to act up.

[Blueraven]

Good point. I went over quite a few and it did not act up. Only going up a hill did it act up. And that was the only time did it stumble.

[MAS Tequila]

Did you downshift going up the hill, or did you let the engine bog down?

These bikes like to rev, they do not like to run in higher gears at lower rpms.

IF and I mean IF you're in too high of a gear and pull the throttle it WILL bog down.

Do you use fifth gear as an overdrive? That is what it really is meant to be. Anything under 60mph and you shouldn't be in fifth.

I am not saying you do ride in too high a gear. I'm just throwing it out for consideration.

MT