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03-30-2010
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#1 |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,709
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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?
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03-30-2010
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#2 |
 
Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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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 
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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. |
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03-30-2010
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#3 |
Join Date: May 2007
Location: Westminster, Maryland
Posts: 3,689
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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
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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 |
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03-30-2010
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#4 | |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,709
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Re: Idle Flare UP
Quote:
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. |
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03-30-2010
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#5 |
  
Join Date: May 2007
Location: Peoria, AZ
Posts: 9,155
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Re: Idle Flare UP
Failed IAC or TPIS ?
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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 |
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03-30-2010
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#6 |
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,169
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Re: Idle Flare UP
Check for Mice or remnants of.....
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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 |
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03-30-2010
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#7 |
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Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,169
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Re: Idle Flare UP
Maybe a loose nut behind the wheel
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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 |
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03-30-2010
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#8 |
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Idle Flare UP
Usually a bad tune, might want to get a new stock chip, check the for sale section.
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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. |
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03-30-2010
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#9 |
 
Join Date: Jan 2006
Location: Niceville
Posts: 998
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Re: Idle Flare UP
Stuck injectors.
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03-30-2010
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#10 | |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,709
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Re: Idle Flare UP
Quote:
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.
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