now with the old (repaired) tps the bike starts better. with the old one it was like 1 try out of 30 would do it but now it is 1 out of 10 success on starting. it starts so slowly and then in 3 secs it puts itself together and works normally.

 

OP, great to hear you are running again. My suggestion is to run some injector cleaner through that now. It should start a lot easier than that.

In the interest of investigating the operation of the throttle position, I have thought about it a little more. If someone knows exactly how it works or is a EE, let them enlight me. But short of that, I am thinking this is as good as explanation as I can come up with.

I believe the injector controller is monitoring the voltage of the wiper. This wire is connected to the injector controller, which is grounded. The wiper must be grounded via the controller or it will not work.

We would need the resistance of all the items to perform an accurate analysis of what is going on.. but, the resistance of the wiper is going to affect the voltage measured at the wiper, as it moves throughout it's range.

 

duriek, I know that you are really trying to wrap your head around how the electronics work on most f/i engines. I think that the biggest issue you are not understanding is that the ecm provides a reference(closely regulated-normally 5v) voltage and a isolated ground to all of the 3 wire sensors(tps, map) and then uses an output voltage from those sensors to infer info on what you are asking the engine to do. The tps functions as a potentiometer Potentiometer - Wikipedia, the free encyclopedia

It seems that you think that it functions like a 2 wire temp sensor (thermistor or rheostat) where the ecm applies a current limited voltage to one leg and ground to the other. As the resistance of the sensor changes, it varies the voltage that the ecm sees on the supply leg.

Easiest way to determine which type of sensor you're dealing with is to look at how many wires are attached to it- 3 means it functions like a potentiometer and 2 means it works like a rheostat.

 

latest news I put the old gas that I got from the tank when the first problem occurred, yesterday again I tried to use it just to see if that was the very problem in the first place. and as expected, bike again did not start in the middle of the road I tried to bump start... useless. then brought it to another garage (locally the guy is said wiser than the other dealers & repairmen) and explained the old repairs and problems caused. the guy smelled the tanker and said definitely there is something strange in the oil even claimed it may include some small amount of diesel. today in the morning the guy called and said it is working like a swiss clock. tomorrow I'm gonna get the bike and check if it is really that good and still afraid of seeing it with half-done.

@GBAuto and @duriek

thanks for your explanations again. GBAUTO I got the difference on Tp sensory and the way they act as a potentiometer. the thing is they just send variable to those part which actually changes the mixture ratio or other things. they are like the volume control ***** in old radios.

 

OK, thanks....
for the unit to operate the resistance needs to be considerably less than the resistance on the wiper as it reports back to the module. The resistance of the potentiometer does effect the output of the wiper, but not much. In this application, you could just turn the throttle more, or less as required. If you needed to track the position in absolute detail, the impedance would want to be pretty close to design, but I don't think that is too critical in this application.

 

the problem is solved.

the problem was the mixture of the gas rushing into the engine.
the gas station was so old or somehow bad and gave me a kind of gas with some diesel or other oily mixture to increase performance or something and it blocked and polluted my injection and oil system.

the garage cleaned the injection, ignition, fuel hoses and the all equipment related to transfer of the gas circulation and now it works excellent like the first day.

during the problem, I lost two spark plug the guy told me that because of the bad fuel your injection system and fuel pump pumped sort of strange mixture into the burning room and the plug couldn't burn them all so it was giving black smoke because of that. anyway the problem is solved completely now. when you have bad fuel, it is not enought to clean only the tanker you also have to clean the other parts.

thanks for the help provided.
appreciated!