GTS Club

the dude · Posted: Mon Mar 08, 2010 9:01 am Post subject: TPS adjustment, hot or cold

Hey men, I have heard that the TPS volts are different, weather it's warm/hot or cold, in the summer when it's hoter 0.58 works fine, cold???,
not as well, like I have said before, the bike has a mind of it's own,
talk to me.
Thanks The Dude

24c · Posted: Mon Mar 08, 2010 10:54 am Post subject:

TPS is a result of 5V in and varying resistance from the potentiometer, which might vary slightly in cold weather, but more likely your 5V or resistance to the TPS sensor has changed through corrosion.

Cold weather causes bigger droplets of fuel in the inlet tracts, which will not ignite or burn as well. Plus the fuel is different too compared to 1993.
_________________
The MicroSquirts are working on the GTS1000 and Thunderace EFI project

the dude · Posted: Wed Mar 10, 2010 7:18 am Post subject:

Hey 24, let me ask you this, first the bike likes hot weather, if I remove it, the TPS, say pull it off/out, use contact spray, clean it up is that cool and can I just put it back on easy, and in warm weather the bike likes it set at 0.58v and the pots at 1 O'clock, do you agree?
Thanks The Dude
ps you guys hearing about the Toyota's big fooking mess over here.

24c · Posted: Wed Mar 10, 2010 12:31 pm Post subject:

TPS comes off dead easy, two screws just make a note of its position, as it can rotate. Folklore suggests that 1 o'clock is a good postion, and voltage as per manual is OK.

I have never adjusted mine. Shocked

_________________
The MicroSquirts are working on the GTS1000 and Thunderace EFI project

derby boy · Posted: Wed Mar 10, 2010 7:48 pm Post subject: My adjustment attempt

OK, someone set me straight. I had the dreaded surge in lower gears @ 3K rpm. I got the manual and checked the ohms b/w the 1st & 3rd pin. In closed throttle is was around .42 and open was in the low end of spec. I adjusted it to around .57 ohms, reconected it and started it up. I slowly gave it a little throttle and it started to surge @ 2K rpm. Shut it of and adjusted again. I ended up at .62 ohm closed throttle. The surge in nuetral went away and the bike runs smooth. Only problem is that it turned on the "Check Engine" light.
So my question is should I try to reset it to .58-.59 ohms and road test to see if the surge goes away while riding. Should I remove the TPS and clean it with contact cleaner?
Will adjusting the air mixture and sync the throttle bodies help?
This bike is new to me and I'm still trying to work out some of the bugs.
Other than that, it runs great and still strong at 50,000 miles.

24c · Posted: Wed Mar 10, 2010 8:42 pm Post subject: Re: My adjustment attempt

the dude · Posted: Thu Mar 11, 2010 10:11 am Post subject:

Hey men, well I like to talk about this, my GTS does the surge from time to time, meaning once about every 6 or 8 months, I have to set the TPS, I have done a hell of a lot of research about this, a 100 houres at least.
Seems .58 on the TPS, and pots at 1 O'clock is best, last time, after it did it the TPS changed, set it back to .58 went back to running great again,
but my bike has a lot of miles now, so I'm thinking maybe a change is due?
again seems the bike runs better on a hot day? anyway I am going to get in there in the next couple days and set the TPS and may move the pots, got a big ride this weekend, so I have to get it right, I will let you men know what's up, but if I have to set the TPS every 6 months I'm ok with that.
Thanks The Dude

derby boy · Posted: Thu Mar 11, 2010 6:57 pm Post subject:

Well, I figured out why the "Check Engine" light was on. The last moron that worked on it (yeah that's me) forgot to plug the TPS back in.

24c · Posted: Thu Mar 11, 2010 9:02 pm Post subject:

the dude · Posted: Sun Mar 14, 2010 4:40 am Post subject:

Well men, today I adjusted the TPS, .58 and was ok, not like last time when .58 made it nice and smooth, so after many test rides, .62 is the new number, running good now, so now after all the yelling .58 .58 .58 is it dont listen to anybody else, sorry, although .60 was good too, I also made a tool that clamps right in the TPS to set it, hooks right up to the meeter and I am going to sell them, 10 bucks each Ha Ha.
Like I said before my bike has a mind of it's own, likes .62 now maybe in 3000 miles it will like .64 or .58 again, and the pots at 11 O'clock.
I will say this the TPS is very sincitive, not ruleing out I might need a new one. If anyone has a new one I'll trade, got lots of parts.
Anyway the TPS, POTS, saga continues.
All is well in sunny California, going to ride Sunday, YEAH.
Later men
The Dude Cool

wheeler · Posted: Sun Mar 14, 2010 5:03 pm Post subject:

Ok, i am going to add some of mine soup to this...
I still have the TPS set at factory position (white marker still unbroken on the screws).
It realy doesnt need any adjustments at all.
Our EFI has the so caled fuel cut of programed in the ECU...changing the position (voltage) of the TPS sets the fuel cut of to happend at another rpm and doesnt realy eliminate it. So to tell it short...the "surge" will allways be there no mather what you do with all the sensors on the engine.
The culprit is the diference in the two air pressure sensors (simplyfied)...
The ECU gets information from its own air sensor (mesuring the atmospheric pressure) and from the "vacuum" sensor or the intake manifold air pressure sensor. Upon the diference in the air pressure the ECU squirts the needed amount of fuel in the intake ports...now these two sensors are there only to make sure the engine runs smooth in all elevations and weather conditions.
So why the hell is the GTS jerking forth and back on the flat road at modest throttle openings ?!?!?!?!?!
The answer is quite simple...because it has no load on the engine and the manifold sensor is changing its pressure value so the ECU strugles to change the amount of fuel acording to the sensors information.
And this is something we can not change unles someone cracks the ECU code and succedes at reprograming it.
Dude, have you ewer asked your self why this jerking newer ocurs at a slight upslope? Because going uphill there is allways the load on the engine and the sensor doesnt change the signal strength as is gets stronger vacuum from the engine...

the dude · Posted: Mon Mar 15, 2010 6:30 am Post subject:

OK this ECU, TPS thing, is a mind trip, Wheeler I know your smart, but I have spent a lot of time reading, and fooking with this, here is the thing, there are people that can rebuild a fooking ECU, I would like to end this.
read my last comments, I can mess with the TPS and make it work, why is that.
Only seems to work for 3000 miles or so.
It's like we can stuff a maganite somewear shit, ya that is a streach.
But like I said if I have to reset every 3000 miles, well OK.
This is the biggest problem with the GTS, I found way around it, but there has got to be a way to end it.
Went on a ride today and all was well.
but sooner or later it will come back, and I will adjust again.
We need a GTS God, like the fookin dude that made it?
Although I have had many bikes that surge a bit, our we really putting to much into this?
The Dude is spent, will I lay on my death bed woundering what the fuck the problem is?
The Dude has lost his mind, got to refuel.
Thanks men

24c · Posted: Mon Mar 15, 2010 7:18 am Post subject:

the dude · Posted: Mon Mar 15, 2010 7:41 am Post subject:

Hey I agree, like I said I was not ruleing out needing a new TPS unit, that is a part I dont have, sooo where do I get one, and 5v signal what do you mean? and also there are somebody or companeys that can rebuild ECU's and or tweak them? yes.
Thanks The Dude

Daf · Posted: Mon Mar 15, 2010 10:03 am Post subject:

I think the biggest influence is the drive chain tension which makes the surging more noticeable, Dude are you adjusting the chain when you fiddle with the TPS, I do most of my maintanance tasks at the same time.
Also atmospheric pressure and humidity will have an effect.