ZR-1 Net Registry Forums  

Go Back   ZR-1 Net Registry Forums > C4 ZR-1 > C4 ZR-1 Technical Postings

Reply
 
Thread Tools Display Modes
Old 03-30-2010   #1
XfireZ51
 
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,709
Default Idle Flare UP

Got the car out of its deep winter slumber today. Temps close to 60 here in Chitown and may hit 80 this week. Car started fine and idled fine for 10-15min, then the idle flared upwards to aboput 1500rpm and dropped. Did this a couple of time without any indication. It would idle back down to 750 or so. I had a code 43 which I believe is knock sensor, but I think this is a result of the flare-up not the cause. Cleared the ECM and drove him with no further DTCs. Nearing home I did get a bit of a backfire through the exhaust and noticed that the idle was not dropping as quickly. Anyone else experience anything like this after bringing car back from deep slumber?
XfireZ51 is offline   Reply With Quote
Old 03-30-2010   #2
Ccmano
 
Ccmano's Avatar
 
Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
Default Re: Idle Flare UP

It's just excited to be awakend from it's winter time slumber. Kinda like morning wood...

Just let it see the light of day and drive it, see what happens.
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.
Ccmano is offline   Reply With Quote
Old 03-30-2010   #3
QB93Z
 
QB93Z's Avatar
 
Join Date: May 2007
Location: Westminster, Maryland
Posts: 3,689
Default Re: Idle Flare UP

I suggest checking all of the connections to the Plenum. Also, you may have a problem with the MAP (Manifold Air Pressure) Sensor. Check the hose to the MAP and make sure it is not softened and collapsed.

Jim
__________________
If it isn't fun, you aren't doing it right!

1990 Black ZR-1 - sold
1993 Quasar Blue ZR-1
1994 Competition Yellow ZR-1
1995 Dark Purple ZR-1

Maryland State Coordinator
WAZOO Member
QB93Z is offline   Reply With Quote
Old 03-30-2010   #4
-=Jeff=-
 
-=Jeff=-'s Avatar
 
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,169
Default Re: Idle Flare UP

Check for Mice or remnants of.....
__________________
1990 Corvette ZR-1 #1051
Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback
Late Model IH - Plenum
Coilovers - 4.10s
Custom Interior
NCM Lifetime Member #978
-=Jeff=- is offline   Reply With Quote
Old 03-30-2010   #5
XfireZ51
 
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,709
Default Re: Idle Flare UP

Quote:
Originally Posted by QB93Z View Post
I suggest checking all of the connections to the Plenum. Also, you may have a problem with the MAP (Manifold Air Pressure) Sensor. Check the hose to the MAP and make sure it is not softened and collapsed.

Jim
Jim,

I thought about that or the TPS being in one spot for so long that there may have been a bit of oxidation. With use it wore off possibly. Just bought 3 Ltrs of the Castrol GTX 10W-60 for the trans (@$10) AND 12 Qts of the Castrol 15W-40 Diesel (high zinc) for the oil change. Next up is replacing clutch pedal. Get ready for run to BG in case I go.
XfireZ51 is offline   Reply With Quote
Old 03-30-2010   #6
GOLDCYLON
 
GOLDCYLON's Avatar
 
Join Date: May 2007
Location: Peoria, AZ
Posts: 9,155
Default Re: Idle Flare UP

Failed IAC or TPIS ?
__________________
GOLDCYLON - 91 ZR-1 #2014
GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's)

GOLDCYLON - 11 CTS-V


Arizona State Director




91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat

90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat

11 RED/GREY CTS-V
GOLDCYLON is offline   Reply With Quote
Old 03-30-2010   #7
-=Jeff=-
 
-=Jeff=-'s Avatar
 
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,169
Default Re: Idle Flare UP

Maybe a loose nut behind the wheel
__________________
1990 Corvette ZR-1 #1051
Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback
Late Model IH - Plenum
Coilovers - 4.10s
Custom Interior
NCM Lifetime Member #978
-=Jeff=- is offline   Reply With Quote
Old 03-30-2010   #8
LGAFF
 
LGAFF's Avatar
 
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
Default Re: Idle Flare UP

Usually a bad tune, might want to get a new stock chip, check the for sale section.
__________________
LGAFF
90 #966-150K miles-sold
92 #234-sold
1987 Callaway TT #17
1991 ZR-1 #1359

Last edited by LGAFF; 03-30-2010 at 09:58 PM.
LGAFF is offline   Reply With Quote
Old 03-30-2010   #9
Demps
 
Demps's Avatar
 
Join Date: Jan 2006
Location: Niceville
Posts: 998
Default Re: Idle Flare UP

Stuck injectors.
Demps is offline   Reply With Quote
Old 03-30-2010   #10
XfireZ51
 
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,709
Default Re: Idle Flare UP

Quote:
Originally Posted by LGAFF View Post
Usually a bad tune, might want to get a new stock chip, check the for sale section.

Always good humor from Lgaff.
I disconnected the BAT, then opened ECM. I use an Ostrich so I pulled connections apart including adapter. That seemed to work as far as the flare up. Didn't experience any after that altho I did have what appears to be a sticky throttle at the end. Car going up on jacks tomorrow and fluids begin to drain.
XfireZ51 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 12:15 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright ZR-1 Net Registry 2020