sr running funny !! lack of power after 30 minute of driving

[pdx_s14]

sup guys, i have an red top sr20det in s14( stock turbo,stock everything but a fmic,koyo radiator ).... lately my sr is running funny.... when i warm up the car and start to drive.... everthing is fine.... but after driving like 30 minutes or so it start to feel like theres lack of power and it feels like its leaning out....
i have checked everything... maf..tps..spark plugs...coil packs....cleaned out the throttle body,intake manifold, iacv,no leaks in the ic piping changed out all the boots, battery. can you guys give me an idea of where else to look ? time for rebuilding maybe ? thanks

[IngS14]

ah-ha! did you check the water temp sensor? many ppl overlook this sensor and consider its not a tune-up item.this is what im talking about........ http://cgi.ebay.com/ebaymotors/SR20DET-S13-S14-SILVIA-180SX-OEM-WATER-TEMP-SENSOR_W0QQcmdZViewItemQQcategoryZ33603QQihZ011QQi temZ320048019377

[pdx_s14]

ings14... thanks for the rely....nope didnt think of that....i'll look it up in FSM and test it out tomorrow... if is bad which one do i need to order? s13 or s14 ? i know you use the temp sensor which ever that match the chassis.... since this sensor is sending signal to the ECU. i'm guessing s13 since im using s13 ecu(#62) right ?

[fliprayzin240sx]

IIRC the sensor is the same for the SRs and KAs. The chassis specific water temp your thinking of is for the gauge. Its the bigger sensor of the 2 on the water neck that you need to change. Also, check the o2 sensor.

[IngS14]

im not too sure it should be the same from s13 & s14 sr,not ka tho.

[pdx_s14]

will....should'nt be the o2 tho.... i changed the o2 like a year ago....but ill check it anyways just to make sure....