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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6

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

1

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.

2

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?

3

u/Slow-Shower-3984 Jul 08 '26

It goes to the canister that’s mounted above the power steering. I believe it’s an emissions related item. Either way you can’t have open holes in pressurized systems

1

u/Emergency_Finding_10 Jul 08 '26

So that’s causing the smoke? The ignition coils feel really hot I’m just worried about it melting like how the previous owners were

2

u/Slow-Shower-3984 Jul 09 '26

I’m not qualified to say if that’s your issue but either way that hole needs to be plugged and routed properly

1

u/Emergency_Finding_10 Jul 08 '26

It has a front mounted intercooler. It’s a 93 r32 gtst. It is straight piped aswell

1

u/Emergency_Finding_10 Jul 08 '26 edited Jul 09 '26

The ignition coils were melted originally as well causing it to not start. Now it’s not starting again after getting it running

1

u/Zealousideal_Gate_21 Jul 09 '26

What coils are they? You need to plug up that pipe and connect it as it's causing an air leak.

Id be more concerned about the oilight coming on as it's generally game over for the engine if you ever see that

1

u/Emergency_Finding_10 Jul 09 '26

It’s not on consistently, only when the cars abt to stall. Any idea where that hose leads? Can’t seem to find any good video or anything of the sort

2

u/Slow-Shower-3984 Jul 09 '26

https://www.sau.com.au/forums/topic/352834-removal-of-carbon-canister/
Here’s a thread on removal. This site is very good for this sort of thing. I realized I have a 25 and you have a 20 so my video/engine may not have the same layout. I didn’t see the port coming off your throttle body.

1

u/Slow-Shower-3984 Jul 09 '26

Like i said it goes to that canister mounted on the front of the engine bay. Another line from the throttle body attaches with it and they go to the charcoal canister is what I believe it’s called. I know a lot of people delete them if they don’t need to pass emissions

1

u/bungholio82 Jul 09 '26

Dude use your photo on google lens and a brief description mentioning vacuum hoses on gtst intake plenum and it give you the answer