Hunting idle issue - Page 5 - ZR-1 Net Registry Forums

MuRCieLaGo · 03-12-2018

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

MuRCieLaGo · 03-13-2018

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

https://youtu.be/yMQEB8fUhXE

Ccmano · 03-15-2018

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

MuRCieLaGo · 03-15-2018

Quote:

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 · 03-15-2018

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

Ccmano · 03-15-2018

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 · 03-15-2018

Quote:

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.

Quote:

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 · 03-15-2018

Quote:

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 · 03-15-2018

Quote:

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!

03-12-2018	#41
MuRCieLaGo Join Date: Aug 2014 Location: Trois-Rivieres (QC) Posts: 473	Re: Hunting idle issue Oh... You just ruined my evening. I'll keep searching then.

03-13-2018	#42
MuRCieLaGo Join Date: Aug 2014 Location: Trois-Rivieres (QC) Posts: 473	Re: Hunting idle issue I'm wondering if that "air" sound is normal. It's pretty loud. https://youtu.be/yMQEB8fUhXE

03-15-2018	#43
Ccmano Join Date: Jun 2006 Location: Sparks, NV Posts: 2,852	Re: Hunting idle issue Can’t tell from the video. There’s a leak somewhere just keep at it. H __________________ 90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold.

03-15-2018	#45
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,699	Re: Hunting idle issue This is a major reason of why we dump the secondaries. Besides, there's better use for that vacuum. __________________ [SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX

03-15-2018	#46
Ccmano Join Date: Jun 2006 Location: Sparks, NV Posts: 2,852	Re: Hunting idle issue 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 __________________ 90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold.