Hunting idle issue

[MuRCieLaGo]

Oh... You just ruined my evening. I'll keep searching then.

[MuRCieLaGo]

I'm wondering if that "air" sound is normal. It's pretty loud.

https://youtu.be/yMQEB8fUhXE

[Ccmano]

Can’t tell from the video. There’s a leak somewhere just keep at it.
H

[MuRCieLaGo]

Originally Posted by Ccmano

Can’t tell from the video. There’s a leak somewhere just keep at it.
H

Sorry I didn't update the thread.

I feel bad. 5 pages... Maybe I should type less and work more.

Problem was pretty much impossible to see with the plenum still on... But when I removed it, it was pretty simple. Marc Haibeck says on his awesome vacuum leaks PDF that GM added a clamp on that "rubber connector" after '91. However, I went to get the part number of that clamp to GM and they showed me the diagram of a '92.

There is no clamp.



Anyway, problem seems to be solved now. However, vacuum pump still turns on every 15 seconds or so. Haven't really tested the car on the road, it's winter here.

[XfireZ51]

This is a major reason of why we dump the secondaries. Besides, there's better use for that vacuum.

[Ccmano]

Pump running every 15 seconds is fine. Haibeck says if it stops for at least a second or two there is enough vacuum back up. Good work tracking it down!
H

[MuRCieLaGo]

Originally Posted by XfireZ51

This is a major reason of why we dump the secondaries. Besides, there's better use for that vacuum.

That was my plan initially but when I found out that you need to access the heads (or something like that, I can't remember), I gave up that project.

Originally Posted by Ccmano

Pump running every 15 seconds is fine. Haibeck says if it stops for at least a second or two there is enough vacuum back up. Good work tracking it down!
H

Thanks you've all been very helpful I'll remember that!

I'm on the forums for 4 sports cars and this one here is the best, no doubt!

[XfireZ51]

Originally Posted by MuRCieLaGo

That was my plan initially but when I found out that you need to access the heads (or something like that, I can't remember), I gave up that project.



Thanks you've all been very helpful I'll remember that!

I'm on the forums for 4 sports cars and this one here is the best, no doubt!

You can just tie-wrap the secondaries OPEN and get a calibration supporting that.

[MuRCieLaGo]

Originally Posted by XfireZ51

You can just tie-wrap the secondaries OPEN and get a calibration supporting that.

If I am to delete the system, I'd rather do it cleanly and remove it completely!