where 2nd TPS is located? and what is TPS anyway???

sorry for my poor knowledge

 

Throttle position sensor tells the ECU the amount of opening position of the throttle butterfly . This value will go from 0 % closed to 100 % full open . Geometry O to 90 degrees is not used as a reference . The ECU gives the sensor a highly controlled reference voltage say 5.0 volts and is modified and goes back to the ECU as a changed voltage compared to the reference voltage . That's how the ECU " sees " the 0 % through 100 % butterfly position .

I have the inline 6 cylinder but the sensor on the V8 is on butterfly pivot axis .

 

i believe i can see that through obd2 scanner, ?

 

look at this video, is this normal? i push pedal to the bottom, and why it's not 100?

 

It does start off in 2nd gear if sport isnt selected

 

Common problem, it is either a combination of too much play in the cable and the accelerator pedal stop wrongly positioned, or one of them.
You will first need to take out any slack of the cable, which you can do at the cable end at the Throttle Body.

Lift the small square which holds the cable, and turn it left or right to slacken or tighten the cable.
If you see the valve opening not returning to the base value (~2.5%), you turn the square a tat back.

Then check the accelerator pedal stop. In your case it might be just a stop, otherwise it is switch.
You can check by trying to push it, fixed or clicking.

If it is a stop, just turn it left or right, till you get 90-92%, not 100.

If it is a switch, do the same, but you have to be careful with the wires underneath, which are easy to break.
Basically the stop can only turn some 30 degree, but if you are not sure, pull the carpet up and watch the wires.

 

So, did you check your spark advance now?

 

yes spark advance is 4-5 idle, 30 and more when accelerate.

i have adjusted this one, and now i have 100% when i push pedal to the bottom, i think this was the problem why my acceleration was slow.

https://i.imgur.com/Wtu1XIT.jpg

will be doing test drive soon

 

looks like it drives better now, even without sport mode it accelerates till 6800rpm. BUT it's still slow from the start, here is the video i made.

​​​​​​what you think?


and video with good acceleration i found on youtube

 

today i will try to look at 2nd TPS that feeds the gearbox ECU , maybe there something is wrong, now jaguar drives very good, , expect it's VERY sluggish at take off.

 

also will try to clean whole throttle body.

and one my friend said to look at MAF readings, ,what normal MAF values should be?