Hunting idle issue - Page 3 - ZR-1 Net Registry Forums

Ccmano · 11-13-2017

Quote:

Originally Posted by MuRCieLaGo

So I guess I'll go through that pdf, seems to be fairly simple! I bought a Bluetooth adapter but it doesn't work in real time, I get a reading every 3 seconds when I'm lucky (frustrating). I might remove that Secondary Vaccuum System (and sending my chip to Marc Haibeck)...

Video was taken at the startup after disconnecting the battery. Temperature was just starting to rise on the needle (10 minutes after I started the car).

PS: When I removed the plenum, there was still some pressure in the coolant system. I know it basically filled the hole that goes to #6 cylinder. The car had a lot of white smoke for maybe 15 minutes at idle. Not sure if it could have affected something.

I can't thank you enough for your help guys. I love the ZR-1 community, so friendly.

As Hib states a small leak in the secondary system is unlikely to cause the idle problem. When you took the plenum off the last time what exactly did you do besides the coil packs? If you removed the injectors and the fuel rail it possible your vacuum leak is at one of the injector O rings.
H

MuRCieLaGo · 11-13-2017

Quote:

Originally Posted by Ccmano

As Hib states a small leak in the secondary system is unlikely to cause the idle problem. When you took the plenum off the last time what exactly did you do besides the coil packs? If you removed the injectors and the fuel rail it possible your vacuum leak is at one of the injector O rings.
H

I didn't touch anything from the fuel system. But I do hear an "air sound" from somewhere under the plenum, driver's side. Can't see anything disconnected though.

Got called today to work on a ship until January.

To be continued in 2018!

XfireZ51 · 11-13-2017

Quote:

Originally Posted by MuRCieLaGo

I didn't touch anything from the fuel system. But I do hear an "air sound" from somewhere under the plenum, driver's side. Can't see anything disconnected though.

Got called today to work on a ship until January.

To be continued in 2018!

Must be a significant leak if u can hear it w motor running.

Ccmano · 11-14-2017

Bingo....
H

XfireZ51 · 11-14-2017

So blocking the airhorn should make it even louder.

tiegsd · 11-14-2017

MAP sensor line disconnected or clogged maybe?

Sent from my SM-N920V using ZR-1 Net Registry mobile app

MuRCieLaGo · 11-16-2017

Quote:

Originally Posted by XfireZ51

So blocking the airhorn should make it even louder.

I'll try this!

Quote:

Originally Posted by tiegsd

MAP sensor line disconnected or clogged maybe?

Sent from my SM-N920V using ZR-1 Net Registry mobile app

Car pulls perfectly strong... If the line was disconnected/clogged, the car would have lots of black smoke and run really bad, if I'm not mistaken.

tiegsd · 11-18-2017

Hmmm, yeah it was the hunting that made me think of this, super easy to check. Car ran like crap at in town speeds, but seemed to smooth out when I got on the throttle. Anyway, just a thought.

Sent from my SM-N920V using ZR-1 Net Registry mobile app

MuRCieLaGo · 11-21-2017

I've got another question that might be related to the issue...

If somebody can answer that, he will be my new hero.

In June, I also removed the plenum. When I removed the hose pictured, look what I found inside the hose. What is that?

XfireZ51 · 11-21-2017

If it was in the fuel pressure regulator hose, it should not have been. It was blocking vacuum to the FPR and so not allowing correct fuel pressure.

Question is why would someone do that?

11-14-2017	#24
Ccmano Join Date: Jun 2006 Location: Sparks, NV Posts: 2,852	Re: Hunting idle issue Bingo.... 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.

11-14-2017	#25
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,698	Re: Hunting idle issue So blocking the airhorn should make it even louder. __________________ [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

11-14-2017	#26
tiegsd Join Date: Jul 2017 Location: West Chester, PA Posts: 378	Re: Hunting idle issue MAP sensor line disconnected or clogged maybe? Sent from my SM-N920V using ZR-1 Net Registry mobile app __________________ 1990 Black/Black ZR-1 #1155 1993 White/Red coupe (Regrettably sold)

11-18-2017	#28
tiegsd Join Date: Jul 2017 Location: West Chester, PA Posts: 378	Re: Hunting idle issue Hmmm, yeah it was the hunting that made me think of this, super easy to check. Car ran like crap at in town speeds, but seemed to smooth out when I got on the throttle. Anyway, just a thought. Sent from my SM-N920V using ZR-1 Net Registry mobile app __________________ 1990 Black/Black ZR-1 #1155 1993 White/Red coupe (Regrettably sold)

11-21-2017	#29
MuRCieLaGo Join Date: Aug 2014 Location: Trois-Rivieres (QC) Posts: 473	Re: Hunting idle issue I've got another question that might be related to the issue... If somebody can answer that, he will be my new hero. In June, I also removed the plenum. When I removed the hose pictured, look what I found inside the hose. What is that?

11-21-2017	#30
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,698	Re: Hunting idle issue If it was in the fuel pressure regulator hose, it should not have been. It was blocking vacuum to the FPR and so not allowing correct fuel pressure. Question is why would someone do that? __________________ [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