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  1. Hey SAU people, Been stalking this forum for a few weeks now as i have recently purchased an R33 S1. I have read most of the diy and have done them. i.e. climate control diagnosis (due to problems but have figured it out) & have cleaned the acc and was resetting my idle (as it was idling way to high 1500rpm then only sometimes sit on 800-900rpm) and while i was there was going to do a ecu diagnosis & tps voltage set but a problem occured. Before i start the main problem i have is that i bought a car that i dont know the history on, which is okay in my books because its my toy to play around on, pull apart and learn even more. All i know is that it had an engine swap about 4 months before i bought it with receipts to prove. Cleaned the acc valve and connected it back up, now while i was resetting the idle via the idle screw on the acc with the tps disconnected i wound the screw all the way in and the idle was still on 1500rpm @ operating temp. So out came the ecu to look and adjust the idle screw on it, Nothing just two hole with no screws just chips and resistors down there... Okay hmm interesting, looked at the sticker on the ecu to see if it is genuine or aftermarket and i cant tell, on the sticker it says " Nissan genuine remanufactured electronic control unit ", (refer to pictures) now the thing that threw me was the word remanufactured on the sticker is this right?? So i thought to myself okay while i am at the ecu ill do a diagnostics test, okay where is the selector screw cant find the either. Great so stuff that off the set the tps then come back to it. So away i go probing the tps wires nothing coming up, okay multimeter stuffed? probe the battery up comes a reading, wtf is going on, it was getting late, so i decided to see something now i disconnected the tps plug, started the car still idling on 1500rpm. Took off expecting to stall nothing, everything was normal, took it around the block hit the limiter everything is the same with the tps disconnected. Pulled over on the side of the road and the idle came down to 700-650rpm because the idle screw is screwed nearly all the way in, cool its idling good now but why?. Turned the car off for 5 mintues started it again back up to 1500rpm took it for another thrash still idling at 1500rpm. Now wtf is going on?? The car is a 1993 R33 with hicas, abs & A-lsd, please refer to pictures for the questions below: - Does s1 A-LSD models ecu look like this? - Is this a standard genuine ecu? - What is that orange button thing next the screw holding the harness in the ecu? - Is it possible the engine swap was with a s2 engine with s2 sensor? are s2 sensors the same as s1? - Shouldn't the car behave like a pig with the tps disconnected when throttle is applied?
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