OK, I've got some issues here. There is a LOT of completely incorrect information here. Also, this is an S14 KA. S13 KA's are different under there. That SHOULD have been mentioned.
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Originally Posted by GUZZLE7
Idle air control (IAC)
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Ok, this is NOT called the IACV. There are actually two valves on that base. The AAC valve is the one with the red connector and it is the PRIMARY idle control valve. The one with the purple connector is the FICD valve and is responsible for bumping up the idle when the P/S pressure is high lr the A/C is on. Those valves are very common to get FILTHY inside and commonly cause idle issues. ANYONE with a KA should remove that valve assembly, dis-assemble it completely, clean the base and ALL components, and re-install the assembly and re-adjust their idle. The IACV valve is under the mani and is a single valve, rather large. The IACV keeps the idle from dipping when you come to a stop, but does NOT control the static idle.
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EGR valves (Exhaust Gas Recirculation)
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The EGR valve is on the right. The valve on the left is the BPT valve. The BPT valve activates the vacuum source to the EGR valve based on exhaust backpressure. The hose coming off the bottom of the BPT valve is very commonly burned up and causes EGR codes very frequently.
OK, the PCV valve is actually the "little nipple" that screws into the back of the front timing cover. Those are almost never replaced, because they're a TOTAL PITA to get to and can cause the engine to burn oil when clogged. To get to them in the car you've gotta remove the alternator and lower alternator bracket. If you go to replace this plan on breaking the hose. That hose gets baked like hell and usually breaks on removal. To get to the other end of the hose, where it connects to the pipe, it is best to remove the starter for easy access. DO NOT USE COOLANT HOSE FOR THE PCV HOSES!!! Coolant hose will swell up and deteriorate when exposed to oil. Oil hose or trans cooler hose ONLY!!!
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Purge Valve
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That is NOT the EVAP purge valve. That is the EGR solenoid...
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Map Sensor
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Once again, that is NOT the MAP sensor. That is the EGR temp sensor. 240's DO NOT HAVE MAP sensors, they have MAF sensors. You usually won't see both present on a car of any make. On the S13's only CA cars have those. On the S14's I think they all do.
Honestly man, I applaud the effort, but there is a LOT of mis-information in this thread. Dorkidori really jumped the gun stickying this one. You clearly don't really know what most of the parts are or how most of the systems function. I would advise anyone looking at this for factual information to do more research. There are a TON of things incorrect about what the OP states here.