HELP!!!! Pleaase 1995 240SX-SE Stalling when warm

[DanaAdude]

Hey guys
I am new in here,
My Daughter has a 1995 240SX-SE that as of late when this car gets up to Normal operating temp its idals low and will often die.
She then has to restart this, This is dangerous with the stering going away and such.
I have tried to figure out what this is but I do not see anything obvious.
Oil is good, Water is good, cant find any Vac lines cracked, wiring harnesses look good
Did a tune up on this thing not to long ago plugs,plug wires, cap, rotor,

Its totally fine until it get up to normal temp then I would guess the choke opens and the fun begans.
No check engine light,
I even tossed my OBD2 meter on this thing its is limited.
I was able to reset the computer with this unit but I do not think that this is going to do the trick.

Would any of you know what the most likely cause would be, looking around there would seem to be problem options up into the 30 somethings.

Thank You for any help.
I am sorry if my grammer is off.

[IanS]

Sounds to me like an issue either with the coolant temperature sensor circuit, or a problem with the idle control system. yYou could try cleaning the idle control valve with intake cleaner. You could also check the service manual for the procedure on reseting the base idle (it is computer controled).

does it run rough, or just low? Will it always restart, or does in also not start when warm.

[DanaAdude]

It runs good cold doesnt miss its like when it gets warn and the choke drops away and she turns or something then it stalls out almost like power stering is enough to drop the idle enough before the engine can recover or adjust and stall out.

[IanS]

And it will always restart?

If so, I would look at the idle control valve. If the coolant temp sensor is failing, then it will run extremely rich when warm, and will tend to flood out, and produce a no start when the engine is warmed up.

I would attempt to clean the Idle control valve, it is often referred to as the IACV (Idle Air Control Valve)

The KA24DE does not use a choke, it uses a valve to allow air to bypass the throttle plate, thereby controling the idle speed. The ECU controls the IACV.

IIRC the S14s also used an auxiliary valve to help with cold idle increase. There should be a troubleshooting guide in the Factory service manual detailing how to test each unit idividually, and a layout of how the system works to control the idle.

Here is a link to the FSM for the 1995 240SX. You can download some or all of the chapters. Its a great reference when working on these cars.

http://www.nicoclub.com/FSM/240sx/1995/

[DanaAdude]

Yep no problems starting,
Had it tossed onto a machine turns out to be a Throttle Position Sensor unit that went bad
Thank You so much for the help

Hey um would you happen to have some directions on how to change this out?
It a small rectangle part with a harness that come of it with a two prong plug, unsure I have the name right on this so I thought I would tell you what it looks like