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It's (the TPS) buzzing? Or something else is buzzing in response? Remove the IACV from the plenum. Block the hole into the plenum with your hand. Get someone to start the car. Let some air is. Do the revs flare up? This is checking that the path into the plenum is clean. After that, is the air hose leading to the IACV fuly clear? After that, either you didn't clean it thoroughly enough to allow the valve to move, or it is broken. -
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Just a follow-up on this topic. From what I can tell so far the rusty residue on the engine block might be unrelated to a coolant leak or maybe just older than anticipated. After driving it from the winter garage to my friend's garage I could not see any new traces of coolant leaking there, but I will test this properly once I was able to fully warm up the car and drive it for a bit. I think I can agree that the whole porous engine block stuff is kind of nonsense, but there is just a silly amount of true, false and half-true information on anything Skyline-related on the internet. -
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I removed the IACV, cleaned it and reinstalled. I found a video on youtube that helped with the whole process, the guy then said the idle needed to be set, so the process was to get the vehicle up to operating temperature, unplug the TPS, set the idle screw in the IACV so the RPMs were around 600, then plug the TPS back in. After I reinstalled the IACV, the car started (because, it was a cold start), once it warmed up, the car died, I adjusted the idle screw to see if that helped anything, it did not, I had to wait about 3-5 minutes, then the car would start back up. Only to shortly cut out, and only crank. I loosened the TPS to see if adjusting that would do anything, and when I would rotate the sensor clockwise, there was a humming noise, but it would go away when I got the sensor in the horizontal position. It only made the hum noise with the key on. What do you guys think? 20250414_172604.mp4
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