F150 Throttle Position Sensor voltage at WOT?

[MakoManiac]

Happy New Year everyone.

I have a 2006 Yamaha F150 (F150TXR 63PX1046819K mfr. date 02/06). Runs fine, but not quite getting the RPM I feel it should with the prop it has.

I hooked it up to the YDS, and found the TPS is only getting to 85 degrees opening (4.116 volts per YDS) at WOT. At WOT, the throttle valves are all "visually" fully open (if anything they visually appear slightly past 90 degrees open). This 85 degree max TPS reading (on YDS) is true with either the linkage connected or disconnected with me manually yanking on throttle valve linkage arm until the throttle assy hits a stop.

At idle position, TPS shows -0.2 degrees opening and 0.693 volts (spec TPS voltage at idle per manual is 0.7V ).

Question is: is 85 degrees of opening (4.116 volts output) from the TPS close enough to true WOT so as to not worry about this potential loss of max output power? Or should I try to figure out how to get the TPS to read 90 degrees opening? Thanks in advance everyone.

[rodbolt17]

TPS voltage at idle is a bit off.
first question.
does your motor have a stalling tendency when moving the throttle between idle and about 1100 RPM ?

[MakoManiac]

It had indeed done that once or twice in the past (when I first bought it used a year ago), but now I do not notice any stalling on slow acceleration attempts. ISC shows 67% with it in my driveway, turned off.

It idles smoothly at 700, accelerates smoothly (whether slow or rapid acceleration attempt), but it does not reach the RPM it should with the prop it has (Reliance 19) on the boat it's mounted on (2007 Edgewater 188cc).

Max RPM is 5200 or 5300. Engine is mounted all the way up (4th hole) and this is trimmed up until prop ventilation starts. Is there voltage left to "squeeze" out of the TPS, or is 85 degrees opening (4.116 VDC) close enough to max TPS output? Manual states anything greater than 4.7V is a fault state and it will ignore TPS for fuel and ignition mapping. Thanks (again) in advance.

[rodbolt17]

some years back on a thread I posted how to set the TPS and the throttle shutters to eliminate that annoying stall and add just a bit more TPS voltage at WOT.
do a forum search for High sierra.
its lengthy but its posted.

its what I had to do to my personal 07 F150 to eliminate the stalling.

some years later Yamaha amended the TPS/shutter sync procedure.

[TownsendsFJR1300]

Here ya go:

http://www.yamahaoutboardparts.com/f...0-th15195.html

I save the good stuff...

[boscoe99]

Here ya go:

http://www.yamahaoutboardparts.com/f...0-th15195.html

I save the good stuff...

I just read it. I am tired now. I am going to lie down. My head hurts.

[Nautical]

Curiosity>> why do some engines run great left alone from the factory and some have to be creatively adjusted to attain normalcy. Just doesn't seem right faking adjustments to fool the ECY to get the engine mapping to run right.. Although I remember years ago we would drill a small hole in the throttle plates to achieve a good idle where the idle was computer con*****ed and non adjustable.I guess same idea.

[TownsendsFJR1300]

Curiosity>> why do some engines run great left alone from the factory and some have to be creatively adjusted to attain normalcy. Just doesn't seem right faking adjustments to fool the ECY to get the engine mapping to run right.. .

IDK but my F150, when BRAND new, had the stalling issue coming in to dock.
It is (was) a documented issue (which shouldn't be happening).

As noted, my local dealership replaced the entire throttle body assembly which cost Yamaha corp OVER $1,000 plus labor.

Only after the master tech (second mechanic) worked on it did it idle in the high 700's and NEVER stalled since. Should have been that way from the factory, period... Cheaper and easier for everyone too..

[RayBersch]

Rodbolt?

some years later Yamaha amended the TPS/shutter sync procedure.

Uh oh. My F150 TLR manufactured 11/2010 has had the stuttering/stalling issue almost since new. I have read the entire High Sierra thead but never tried to discuss the issue with local Yamaha mechanics because there is not a decent one in sight (search for Yamaha techs Maine) and they sure would not listen to a customer who has a tech tip off the internet. So, now that I am retired and can spend time on the issue myself I had planned on attacking this first this next spring.

So, my question, Rodbolt, is does your procedure still apply to my motor or has there perhaps been a change in the procedure that I should follow?

Ray

[rodbolt17]

that procedure I posted is still valid.
easier if you have access to the laptop and the software.
however its not nessasary.
only mandatory equipment is a digital volt meter,tamper proof torx bit set and some paper clips and jumper leads.
typically what I am shooting for is an idle speed of about 700-750,an ISC opening in the 45% range and a TPS voltage of about .72.

if you can follow that procedure I posted it will correct the stalling issue.

I did mine in the summer of 07 cause it looked bad when I was wearing my master tech hat and the stall alarm sounding while I was docking at work or the house.
that and it was annoying .

[boscoe99]

A new procedure for setting the throttle body and throttle link is in the latest service manual. SM is dated October 2011. I wonder how many Yamaha dealer mechanics are even aware of the new procedure.

Regarding the throttle opening and closing angles, they are specified as 0.1 degree/.703 volt when closed and 83.2 degrees/4.033 volts when fully opened. Reference values only, not absolutes.

[rodbolt17]

someplace there is a tech bulliten on it now.
I figured it out 3 yrs before said bulliten.
that dang stall alarm.

how many techs are going to break out the 2011 manual when working on a 2010 and older motor?

almost every F150 we sold back then we had to readjust the shutter/TPS.

[boscoe99]

someplace there is a tech bulliten on it now.
I figured it out 3 yrs before said bulliten.
that dang stall alarm.

how many techs are going to break out the 2011 manual when working on a 2010 and older motor? None. This is one problem with Yamaha data.

almost every F150 we sold back then we had to readjust the shutter/TPS.

The bulletin refers to the updated SM.

Does the name Tyler Rainey ring a bell? He is the guy that said he came up with the new sync and link procedure after working with some dealer's folks.

I read where you lamented Yamaha stopping the yearly updates seminar. It was a good tool to try and tell everyone about new procedures and such. Too much money. Yamaha decided to just throw bulletins and On Board magazines at people and hope they stumbled across a snippet within. If I read something new to me it oft times does not mean much. But then when I have need of that information and actually use it, it all comes clear then. Trouble is trying to remember something from years ago if and when it is needed.

[rodbolt17]

by the summer of 07 I had the procedure perfected.
Yamaha helped me not at all.
out of the box my F150 stalled when small throttle movements were made such as docking.
when it stalls that very loud very annoying alarm horn goes off.

took me about 6 hours to figure it out.

once I figured out its a lean condition,due to the fact it would restart without opening the throttle, I had to start playing.
that's when I found if you fully close the shutters,synch the upper and lower bodies,set the TPS to about .7V. then open the shutter to about .73-.75V
then reset the tps manually to about .7 and it works.
the ISC request should be in the mid 40's range,the idle speed just above 700 rpm and the stalling goes away.
I don't know what the revised procedure is but its similar I use my procedure cause I can do it in 10 min or so.