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Inside the exhaust housing near the flange to the exhaust manifold.

Oil filter is 100% compatible.

Idle control valve is a no go.

For the starter I can't say, but it's very doubtful.

Just as mine, given the outside temperature it heat up for 20 to 30 seconds then just works fine.
And i never heard any noise coming from it.

The only issue I had with it happened on the highway,...

Which one do you need ?

http://nissan4u.com/parts/200sx/er_s14/1996_2/type_1/axle_suspension_and_steering/rear_axle_and_rear_suspension/illustration_1/

Blown FPR.

I don't see much possible causes and you already tested all but the CAS. :p

The other problem i see would be a wiring loom problem. A broken wire who route power to coilpack, you might have...

Are your injectors clicking when you rotate the CAS manually when the key is on ?
If they do your CAS is working but may be not correctly set. Is your exhaust camshaft damaged where you install the...