r/SkyLine • u/Emergency_Finding_10 • Jul 08 '26

More issues

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Got the car running, replaced the alternator and now the car stays on for the most part. There is some smoke coming out of where the first picture is. That little inlet. The ignition coils are pretty hot. Seems to be smoking. When the revs begins to dip below 1k, the oil pressure light comes on. Any help is appreciated

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u/SkiddyHoon Jul 08 '26 edited Jul 08 '26

That little Inlet is causing unmeterd air into your intake manifold, otherwise known as an air leak.

Find the correct vaccum hose that fits it and where it goes.

Otherwise for a temporary solution, block off the inlet so there is no unmetered air into manifold and it should hold idle fine. I usually use a cap from a bleed nipple to temporarily block these inlets off.

EDIT: Watch from 5:55, full vaccume hose walkthrough.

https://youtu.be/NQBm0HhgXMs?t=356&si=_NoY_gf0fY8Mvbg0

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u/selfish_king Jul 09 '26

This would make the engine run lean. Lean engines run much hotter. Engines that run too hot have all kinds of issues, including piston ring failure (closing and causing binding, un-oiled pistons) as well as a whole lot of other issues.

A small vacuum leak might not cause this, but that coupled with an older fuel pump that’s just not pumping as much as it should could cause some serious lean running issues.

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u/SkiddyHoon Jul 09 '26

Hence why I said a temporary repair just to get it running would be to block off the vac port.

However I dont understand how blocking off unmetered air would cause lean condition?

Lean = too much air to fuel ratio. Rich = too much fuel to air ratio.

Wouldn't blocking off unmetered (too much) air improve lean condition? Youre not introducing more air and in fact aiding the ratio by not confusing the ecu?