Nissan 200SX Club - South Africa

Hey guys, what will it influance if you shift the throttle body sensor more to the front or back, it does influance the idling but why how .......

the sensor has 3 functions...

1. idle switch - its tells the computer if the engine is, or is supposed to be idling - this is either ON or OFF.

2. full throttle switch - same as above but NOT used in european spec s13's, like ours!

3. throttle position sensor - this has a variable resistor thingy that measure the position of the butterfly, and the computer makes adjustments to fuel delivery (and timing?) accordingly.

when i was testing on the weekend, if i moved the TPS off the idle position while the engine was running, and while i was measuring RPM and shooting timing - the engine would immediately idle up (it moved from 850 to 1200 rpm) and the timing would immediately advance about 15 degrees, it could've been more (but i was so shocked that i didnt measure accurately)!!!!

Ok thanks, I also played with the sensor, if I moove it moore to the back the car idles fine but I can do what I want I can't get my idling higher than 850 revs, I want it at about 1200, I mooved it a bit forward then as you say my idling jumps wich is what I want but it instantly pics up a slight miss.

Now, peddle response is great now, car idles where I want it to idle, slight miss on idling whitch I can handel, is it safe to leave it like this?

that i dont know...

but i also get that slight miss on idle if i leave the TPS forward.

the switching point on mine is slightly rearward of the middle.

i've also thrown out my idling control unit (AAC valve) cos it was broken anyway, and we are using the screw near the throttle pulley to set the idling mechanically. i still get the slight miss when i move the TPS even with the idling set mechanically.

i'm not sure if its good or bad, but an answer should appear soon i suppose.

i've driven the car with the TPS set like that before, it was the previous owner who had it like that - it was fine, but it used to cut out when decelerating, for example when braking with the clutch in approaching a robot. i used to engage a lower gear to start the engine again just before i stopped - but its very irritating, and not recommended obviously.

also - again, i am not 100% sure if the TPS was the exact reason for the engine cut out!!! my engine used to have all sorts of other problems!

If you want a higher idle, use the idle adjust screw, but first disconnect the AAC from the ECU (as per service manual).

OK thanks, I will test it like this and see, so far the only bad thing is the slight miss on idle otherwise throttle response is good and I see no other probs when driving.

Hi Toby, tried it then cleaned it, does not want to go further that 900 revs.

@ draco, why do you want the idle at 1200rpm.....isn't that abit high?

Hey Nuren, remember I have 2 electric fans + when the lights and stuff are on it struggles to idle stable+ I am planning to install my audio system later on, thats gonna screw up the idling....hence 1200 revs.

Veecee and who ever, last night I playd with it again....no not that...the throttle body sensor.... it was fine just idled to high so last night I mooved it again, now I have the problem that you mentioned about the car dieing when you slow down in gear and the take it out of gear.

Tried to get it back where it was yesterday afternoon but can't get it right, I'll try and get it right today.

It seems I am sorted, I could not wait till tonight so I checked it, I mooved it back sothat my idling was normal again and then with the help of the manual idling screw and the idling jet screw I got it on about 1100 revs without plunging the revs after I revd it.

I just hope I still have the throttle response I had yesterday afternoon

In all honesty I wouldn't touch the TPS without a Voltmeter.

The defaults are below 1 K ohm at closed throttle and about 9 K ohm at full.
The ECU relys on this info, My car has a bad miss and it turned out to be the TPS..

IT strange with the idil adjust screw I can make my car idil at 1400RPM not that i want to.

If you looking for better throttle response then I have a few tricks for you

Phinx wrote:In all honesty I wouldn't touch the TPS without a Voltmeter.

The defaults are below 1 K ohm at closed throttle and about 9 K ohm at full.
The ECU relys on this info, My car has a bad miss and it turned out to be the TPS..

IT strange with the idil adjust screw I can make my car idil at 1400RPM not that i want to.

If you looking for better throttle response then I have a few tricks for you

Me too ,me too i also want better throttle response come on phinx share pls

T-cam wrote:

Phinx wrote:In all honesty I wouldn't touch the TPS without a Voltmeter.

The defaults are below 1 K ohm at closed throttle and about 9 K ohm at full.
The ECU relys on this info, My car has a bad miss and it turned out to be the TPS..

IT strange with the idil adjust screw I can make my car idil at 1400RPM not that i want to.

If you looking for better throttle response then I have a few tricks for you

Me too ,me too i also want better throttle response come on phinx share pls

WTF phinx??? where's the few tricks???

better throttle response is on everyone's minds ATM!

Tricks for better throttle response= Piggyback mapped properly.

draco, you sure your car charges enough?