Power Brakes. Educate me.

[Keef]

When's the last time you met a girl by spraying some smoke in a can?

 

[Punknoodle]

When's the last time you met a girl by spraying some smoke in a can?

 

[Eric.]

This is so obviously a vacuum problem. It may not be a strong leak though... especially since you aren't noticing drivability issues. (Though they would be present, when you fix this problem the car will run differently, no doubt)

By any chance would a slightly rough idle support this theory?

 

[Keef]

By any chance would a slightly rough idle support this theory?

Yes.

 

[MistaX]

By any chance would a slightly rough idle support this theory?

Yes. It is running lean, you have more air in than the ECU has accounted for.

 

[Keef]

I wish you good luck finding a vacuum line leak in a mid-engined car.

 

[nobuffalo]

By any chance would a slightly rough idle support this theory?

No, that's just what old Toyotas do.

I've heard of spraying some kind of combustible near the vacuum lines, if the idle increases you have a leak. Would a leaky vacuum line suck air in or blow air out?

 

[Punknoodle]

It sucks air in. Ie, vacuum. The combustable spray trick does work too.

 

[niky]

I wish you good luck finding a vacuum line leak in a mid-engined car.

QFT. Doesn't sound as much a headache as my car, which has an extra set of vacuum lines and almost no vacuum at idle because of my cam overlap...

When's the last time you met a girl by spraying some smoke in a can?

e-cigarette, anyone?

 

[nobuffalo]

It sucks air in. Ie, vacuum. The combustable spray trick does work too.

That's what I thought, the "smoke trick" causing smoke to come out of the line gave me a brain fart. Wasn't thinking.

Downside I suppose of spraying a combustible is pinpointing which line and where it's being pulled into the engine. Probably be easier to just replace all of them... Isn't there only one vacuum line running to the brake booster though, a rather large one at that?

 

[Punknoodle]

Might not be that line though, they are all at the same pressure (or vacuum) so a leak in one will effect the whole system. Hence smoke trick with canned smoke, spray generously around the lines and you'll see it get sucked up

 

[Eric.]

I have tomorrow off so I'll look into all this then. I know there's a handy vacuum line diagram in the engine bay, possibly another in my service manual.

 

[nobuffalo]

With a small leak you might need to blow bloody hard to get smoke to come out. If you were to use smoke in a can, you just spray it around the lines, booster, whatever you want to check, if there is a leak, smoke dissapears where the leak is. No need to disconnect lines, everyone happy and living longer due to not smoking

My bad, I wasn't all there yesterday. I read this post but forgot about it immediately. I now understand the smoke method. 👍

 

[Punknoodle]

I read this post but forgot about it immediately.

Story of my life *Gets out the violin*