High searching Idle - Page 3 - ZR-1 Net Registry Forums

jss06c6 · 02-10-2018

Quote:

Originally Posted by Ccmano

At the risk of stating the obvious. You checked both MAP sensors, right?
H

?? Hose under the ECM ?

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Ccmano · 02-10-2018

Quote:

Originally Posted by jss06c6

?? Hose under the ECM ?

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Yes, the other map sensor is under the ecm on the 90-92
H

jss06c6 · 02-10-2018

Looked at it Hans. No issues. I'll recheck to make sure hose is good.

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mike100 · 02-10-2018

well, since you have eliminated the outside hose connections, it sure sounds like the hard plastic curly-q under plenum hose has popped off. It goes to the gas tank purge solenoid. The leak is big enough to idle at 1200 rpm as you described. My car came like that and was the reason for my first plenum pull.

jss06c6 · 02-10-2018

Quote:

Originally Posted by mike100

well, since you have eliminated the outside hose connections, it sure sounds like the hard plastic curly-q under plenum hose has popped off. It goes to the gas tank purge solenoid. The leak is big enough to idle at 1200 rpm as you described. My car came like that and was the reason for my first plenum pull.

That's my guess too after reading Marc's summary of known offenders! Will know this afternoon when I get under there with my borescope..

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jss06c6 · 02-10-2018

Found it.. unfortunately. Borescope clearly shows the hose on the curved pipe under the TPS going to the gas tank purge solenoid is off. Backfire must have blown it off. Will put hose clamps on these hoses when im in there this time.. happy I found it and glad it's not the TB. Well, needed to pull plenum and IH's to Port them anyway!

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XfireZ51 · 02-10-2018

Quote:

Originally Posted by jss06c6

... happy I found it and glad it's not the TB. Well, needed to pull plenum and IH's to Port them anyway!

The Lord works in mysterious ways.

Ccmano · 02-10-2018

Glad you found it, Had to be something related to the backfire. Unlikely the throttle body would go that suddenly.
H

jss06c6 · 02-10-2018

Quote:

Originally Posted by XfireZ51

The Lord works in mysterious ways.

Indeed!

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jss06c6 · 02-10-2018

Quote:

Originally Posted by Ccmano

Glad you found it, Had to be something related to the backfire. Unlikely the throttle body would go that suddenly.
H

More labor, but easier fix!!

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02-10-2018	#23
jss06c6 Join Date: Aug 2015 Location: Magnolia, Texas Posts: 884	Re: High searching Idle Looked at it Hans. No issues. I'll recheck to make sure hose is good. Sent from my XT1585 using ZR-1 Net Registry mobile app

02-10-2018	#24
mike100 Join Date: Feb 2011 Location: San Marcos CA Posts: 1,802	Re: High searching Idle well, since you have eliminated the outside hose connections, it sure sounds like the hard plastic curly-q under plenum hose has popped off. It goes to the gas tank purge solenoid. The leak is big enough to idle at 1200 rpm as you described. My car came like that and was the reason for my first plenum pull.

02-10-2018	#26
jss06c6 Join Date: Aug 2015 Location: Magnolia, Texas Posts: 884	Re: High searching Idle Found it.. unfortunately. Borescope clearly shows the hose on the curved pipe under the TPS going to the gas tank purge solenoid is off. Backfire must have blown it off. Will put hose clamps on these hoses when im in there this time.. happy I found it and glad it's not the TB. Well, needed to pull plenum and IH's to Port them anyway! Sent from my XT1585 using ZR-1 Net Registry mobile app

02-10-2018	#28
Ccmano Join Date: Jun 2006 Location: Sparks, NV Posts: 2,852	Re: High searching Idle Glad you found it, Had to be something related to the backfire. Unlikely the throttle body would go that suddenly. 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.