2001 150 ox66 Alarm when key on, limp mode

[boscoe99]

People think all Yams are alike. Ain't necessarily so.

Some times one OX66 is different from another OX66.

A little bit of Yamaha knowledge can be dangerous. It will lead one astray.

Biggest thing that confuses most folks is thinking that power gets applied to a device to make it work. Some Yam stuff yes. Most Yam stuff no.

[rodbolt17]

I figured it out.
your a sanitation engineer.

its a stupidly simple speed density EFI set up very similar to the earl TBI and MPI stuff on chebbys of the late 80's early 90's.
why you wont listen to some of us I haven't a clue.
I do suspect you have been on some other websites getting info from idiots.

one of them I used to post on.
then I did not.

you must be dense cause Ill say it again, the 2.6L OX66 DOES NOT cut cyl or spark or injection.
only the HPDI and some of the 3.1L EFI motors did.

DO NOT re anganeer this thing.
the anganeer work was done 20 some odd years ago and they mostly worked flawless until the untrained **** skinner got holt of it.

[countrytn]

dude, I would follow rodbolts advice he has forgot more about yamahas than most will ever know! If that don't satisfy you then go spend several thousand getting it fixed and forget it. In case you don't realize it he is trying to help you

[rodbolt17]

dude
don't get me wrong.
I am not trying to degrade you.
I am trying to make you get mad at that motor and google everything you can about speed density EFI.
at least you have google, when I started it was paper and trial and error.

just don't get hung up.

you kept asking for pages about group injection.
pardon the spelling but is synchrouneous or asynchroneous injection.

normal operation just cruising about its synchroneous.

rapid throttle opening it needs more fuel so it does BOTH.

however now is when rail pressure is MOST critical.
if it aint there the motor falls on its face.

rail pressure is about the MOST critical part, yet its not monitored, the stupid ECU assumes its correct.

[bajakeith]

Lol,,lol

Rodbolt,,Man you have to be THE MOST constant easy going tech around !! Ive been gone from this blog (work) for 4/5 months and just jumped on and read this thread !!! How many times did you repeat youself ??? and your just trying to help the poor fool..bet your a good at fishing !!! Keith...

[rodbolt17]

Baja, I don't get much chance to fish anymore.
anymore I hate boats and boating. its just not fun.
however playing with antique military rifles is a blast .

however I do hope the rockfish show up this year. I may do a bit of fishing then.

I think the original poster has 2 issues going on.
RPM reduction is ALWAYS accompanied by an audible tone.
overtemp,low battery voltage,low engine oil level, water detect if equipped,a crank signal and a stop signal simultaneously are about the only thing that will trigger an audible and RPM reduction on the OX66.
let me reiterate, if you have an audible you have RPM reduction,if you have RPM reduction you have an audible.

NO sensors will trigger RPM reduction nor an audible.

RPM reduction locks the engine speed to 2300-2500 RPM max and the motor will shake like a belly dancer.

[99yam40]

RPM reduction locks the engine speed to 2300-2500 RPM max and the motor will shake like a belly dancer.

My guess is the shake like a belly dancer is from cylinders not firing.

Rod can you enlighten us as to which cylinders they drop and how they are dropped?
Spark removed or maybe fuel?

[rodbolt17]

on the OX 66 2.6L it misfires all 6 cylinders to limit RPM.
it will still deliver fuel cause that's how it lubricates.

[boscoe99]

What does a teacher do when he/she finally comes to the realization that a student is not getting it? And, more than likely not going to get it.

We all have our strengths and weaknesses in life. I suppose the difficult part is wanting to understand something that our weakness is not going to let us understand.

I am never going to understand high level physics. I got over it. Some apparently are never going to understand a Yamaha OX66. I have moved on from trying to understand high level physics. Some will have to move on from understanding an OX66.

Or not.

It is too bad that Yamaha does not publish good information about their motors and how all of the components function and interact with one another. Maybe that would help in some instances.

[99yam40]

I know what you mean, my ex went back to school many years ago once the kids where both in school and I tried to help her with her Algebra.
Apparently I am not a teacher or she just could not get a handle on it, she finally just gave up on the class. I never understood why she could not understand something that simple.

So the OP has 2 cylinders misfiring at idle and will not test things because he thinks it is normal. Sound like trying to understand a motor is harder than we thought

[boscoe99]

I know what you mean, my ex went back to school many years ago once the kids where both in school and I tried to help her with her Algebra.
Apparently I am not a teacher or she just could not get a handle on it, she finally just gave up on the class. I never understood why she could not understand something that simple.

So the OP has 2 cylinders misfiring at idle and will not test things because he thinks it is normal. Sound like trying to understand a motor is harder than we thought

None are so blind as those that refuse to see. (or listen).

[rodbolt17]

sorry.
as a teacher I suck
I have the knowledge, more than some.
its difficult for me to explain it.
however 10 yrs or so of posting on a few sites has helped me quite a bit.

[boscoe99]

One of the most difficult things in the world is to be able to convey knowledge to the unknowing. And then there is the need to have the patience to do it.

The knowing assume (yes, I know) that the unknowing have the prerequisite knowledge to understand what is being conveyed to them. Ain't necessarily so.

Let's say someone comes here asking for help. He is instructed to check the loaded peak voltage on the green wire that is coming from underneath the flywheel. The student does not understand what loaded means. He does not understand what peak means. He does not understand what voltage means. He is color blind and does not know what green is. He does not know what a flywheel is.

All of this could be more readily explained to him in person, by one person. With the motor nearby for a show and tell story. Now try doing it over the internet, in writing (poor writing and reading comprehension by the way) with two, three, four, maybe more folks jumping in throwing out wild thoughts, and the guy gets lost.

The poor fellow wants to be a backyardigan. In the worst way. But it soon becomes apparent that he is not going to be "getting it". It is hard to suggest that maybe he ought to be the one that must take the motor to a dealer.

[Yamaholic]

hey guys. still haven't got to spending any good time at the engine but did go back thru and saw that someone said(rodbolt maybe) that this engine does not cut out on cylinder 2 and 5 at idle. I guess I must have read it on some other forum that they do. I guess I need to confirm if I have all cylinders firing. Seem to remember pulling off those two spark plug caps and it didn't make any difference to idle and though that was the normal operation. I will have to check again when I get time. It does seem to idle fine though.

[Yamaholic]

I figured it out.
your a sanitation engineer. lol. good one.

its a stupidly simple speed density EFI set up very similar to the earl TBI and MPI stuff on chebbys of the late 80's early 90's.
why you wont listen to some of us I haven't a clue.
I do suspect you have been on some other websites getting info from idiots.

one of them I used to post on.
then I did not.

you must be dense cause Ill say it again, the 2.6L OX66 DOES NOT cut cyl or spark or injection. just seeing this now. thanks for the info as I did think they were only on 4 cylinders at idle.
only the HPDI and some of the 3.1L EFI motors did.

DO NOT re anganeer this thing.
the anganeer work was done 20 some odd years ago and they mostly worked flawless until the untrained **** skinner got holt of it.????? anyway, saw that you said you don't boat. do you have a place to test engines under load? or do you just run on a stand with muffs?