car wont idle

[4g63gsr]

Hey everyone im having trouble trying to get me gsr to idle. Its had a aftermarket tb put on and the new tps that has come with it is a 3pin were the old one is a 4. I have set it up the way it was directed to but it just wont idle. Any ideas or help would be much appreciated

 

[Ian91]

Can you retrofit your old tps to the new tb? If the tb was to suit a 93t you would think the old tps would fit it

 

[4g63gsr]

I tried but tottaly different. And the manifold is different to, tried to bolt the old tb upto the new manifold but the bolt holes are totaly out of wack

 

[BMGTZ]

I think the VR4 tps are different to the evo. maybe that would fit

 

[4g63gsr]

It's running a 4g63 out of a vr4, just so difficult to try and get it to idle without changing everything back to oem wich I really dont want to

 

[Ian91]

That's weird. Maybe you'd have to get an adaptor made to attach the oem tps to? Surely a tps that got a wire less would need an aftermarket ecu to run right?

 

[MDK87]

That's weird. Maybe you'd have to get an adaptor made to attach the oem tps to? Surely a tps that got a wire less would need an aftermarket ecu to run right?

Not really, it came from the factory like that remember.
TPS is just a potentiometer on our cars. At it's most basic level, it requires only +5VDC & GND as inputs and throttle signal (0-5V) output.
Nissans have 3 & 4 wire TPS between the same engine on different models and the fourth wire is a throttle home switch.
I can't recall what the fourth wire is on VR4's though.

 

[Ian91]

oh, could be easy then

 

[4g63gsr]

Not really, it came from the factory like that remember.
TPS is just a potentiometer on our cars. At it's most basic level, it requires only +5VDC & GND as inputs and throttle signal (0-5V) output.
Nissans have 3 & 4 wire TPS between the same engine on different models and the fourth wire is a throttle home switch.
I can't recall what the fourth wire is on VR4's though.

mate I dont really understand lol do you have any pics or videos on what to do ? Hopeless with electrical stuff

 

[BYBY5L]

The tps wouldnt be off a newer model would it, I know the tps off newer mitsi's the plug configuration is reversed, dunno what it would do to ya idle

have ya got a pic or link of the t/b your using?

 

[4piknup]

Vr4 had 3 wires and the home switch is on other side where throttle stop is. Later cars had 4 wires and the 4th was the home switch.
You need a home switch for the ecu to know it needs to idle. I think it uses it for fuel cut on decel as well.

 

[4g63gsr]

Ill grab some photos now for you, how do I set up the home switch ?

 

[BMGTZ]

sell house....move to new house.

homes switched.

 

[4piknup]

Get a wife, she will make you do it.

It only has one wire, so its earthed. The wire in the tps plug that doesnt have a corresponding pin in tps needs to be earthed when you are closed throttle. Or just get a 4 pin tps as it is built in

 

[MDK87]

What Jack said. With the extra wire, you want it to be earthed on zero throttle. You could rig up a microswitch on your throttle body to do this if you can't retrofit an idle switch from an older setup.

 

[evo-gsr]

sell house....move to new house.

homes switched.

ha ha ha ha ha. Nice one !

 

[4g63gsr]

Have the 3 wires hooked up but dont know where zero throttle is

 

[4piknup]

2G 4G63T TPS
1 - Green/Yellow (+5v Sensor Power)
2 - Brown/Red (TPS output voltage)
3 - Yellow/Red (IPS switch)
4 - Black (Ground)

1G 4G63T TPS
1 - Green/Red (+5v Sensor Power)
2 - Green/White (TPS output voltage)
3 - NC
4 - Green/Black (Ground)

So... get a 4 pin tps and the one you havent connected is the idle switch

 

[4g63gsr]

Were would I go to get a 4pin that would suit the new tb

 

[4piknup]

All the newer mitsi have 4 wires. But you say its different. Bit hard to guess what yours is. Whats different and post some pics.