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04-17-2012
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#1 |
 Join Date: Oct 2011
Location: STAFFORD VA,
Posts: 576
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THIS SEEMS TO BE GOING AROUND!
Hello all!..as you know I have been rebuilding my Z, and with much help from the site and WAZOO, It is running and looking better every moment,...BUT
As with some of my brethren here I have a IDLE ISSUE AS WELL! here is where I am... *upon start up idles at 1000 to 1200 RPM, NO fluctuation *after warm up it starts to fluctuat from 700-1200 over and over and over... *on the road throttle wants to stick on slow-down at around 2000 and i have to tap the gas to get it down,...NOW..coasting at 10-15 MPH will not allow it to drop...you can tap on it and stays as about 1400....difference?...when at stop it WILL go to 700 RPM,.. what have I done? *replaced the vacuum tube to the LIMITED things I have due to eliminating the scondaries.... *replaced the IAC valve *cleaned the PCV valves so they have that "sound" * plugged up the PCV line to the plenum as well as the booster line (to eliminate the booster and pcv lines)>>>>>>>>>>>the idle drops down but still cycles at that lower rpm * made sure the throttle body was tight. But!!!!!!the throttle seem to need forceto open up the larger plates when driving....(sort of like needing to push th peddle over a slight "cleft" to make the mopen...IS THAT NORMAL?....IT SHOULD BE A SMOOTH TRANSITION RIGHT? OK, I will be uploading everything since the timing and installation,....there are a few other small issues but I am doing everything I can to make it ready for BG. question: could a small hole in the cruise control bellows cause this??? Could you use your help, ideas please!!! 
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[B][I][COLOR=red]1990 ZR1[/COLOR][COLOR=black] [U]#00077 [COLOR=red]RED[/COLOR]/[COLOR=red]RED[/COLOR] (10Y022 PEP CAR) [/U][/COLOR][/I][/B][B][I][COLOR=red]1991 ZR1[/COLOR][COLOR=black] [U]#00517 ("Irene")[COLOR=red]WHITE[/COLOR]/[COLOR=red]RED-SOLD:cry:[/COLOR] [B][/B] [/U][/COLOR][/I][/B][B][I][COLOR=red]1992 ZR1[/COLOR][COLOR=black] [U]#00445("The Revenant")[COLOR=red][COLOR="Black"]BLACK [/COLOR][/COLOR]/[COLOR=red]RED(2016 T.O.D!) [/COLOR] [/U][/COLOR][/I][/B] [B][I][COLOR=red]2009 [COLOR=red]Z06!![COLOR=black]BLK/BLK rare Linen interior[/COLOR] 707HP!![/COLOR] [/COLOR][/I][/B] [B][I][COLOR=red]2006[/COLOR] BLK/BLK Z51 (Just SICK FAST!)SOLD)[/I][/B] [B][I]1996 BLK/BLK LT4 Grnsprt(sold...Twice!)[/I][/B] [B][I]1991 RED/REDL98(Fell off the shipping truck:([/I][/B] [B][I]1980 BLK/RED L82(Sold)[/I][/B] [B][I][B][I]1990[/I][/B] RED/BLK(sold.....In Japan)[/I][/B] [I][COLOR=black][B][I]2006[/I][/B][/COLOR][/I] [COLOR=red]Mustang GT[/COLOR] ([B][I]mach 1[/I][/B])[B](sold)[/B] [COLOR=black][B][I]1969[/I][/B][/COLOR] [COLOR=red]Mach[/COLOR] [B][I]1(sold in Japan)[/I][/B] [COLOR=black][B][I]1969[/I][/B][/COLOR] [COLOR=red]Mach[/COLOR] [B][I]1#2(sold)[/I][/B] [B][I]WAZOO Member...[/I][/B] [url]www.evolution-motorsport.com[/url] facebook/evolutionmotorsportengineering Your Local [url]www.Amsoil.com[/url] dealer/user.. *Victory Loves Preparation* |
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04-17-2012
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#2 | |
   
Join Date: May 2007
Location: Peoria, AZ
Posts: 9,155
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Re: THIS SEEMS TO BE GOING AROUND!
Quote:
http://static.photobucket.com/player...-04-26_724.mp4
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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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04-17-2012
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#3 |
 
Join Date: Jan 2009
Location: Portland Oregon metro area (Washington side)
Posts: 3,207
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Re: THIS SEEMS TO BE GOING AROUND!
I agree it's not the bellow leak. That is up stream.
The fact that it comes down to 700 rpm or so at a stop is encouraging. Do you have way of measuring what the IAC is being told to do? Can you take the bellow off and then wait for it to start cycling and look in at the plates for movement? Could there be oil in the MAP sensor line?
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Scott  Vett owner since 1979._It's about the car and the people |
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04-17-2012
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#4 |
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Join Date: Oct 2011
Location: STAFFORD VA,
Posts: 576
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Re: THIS SEEMS TO BE GOING AROUND!
By the way I also have a code 42
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[B][I][COLOR=red]1990 ZR1[/COLOR][COLOR=black] [U]#00077 [COLOR=red]RED[/COLOR]/[COLOR=red]RED[/COLOR] (10Y022 PEP CAR) [/U][/COLOR][/I][/B][B][I][COLOR=red]1991 ZR1[/COLOR][COLOR=black] [U]#00517 ("Irene")[COLOR=red]WHITE[/COLOR]/[COLOR=red]RED-SOLD:cry:[/COLOR] [B][/B] [/U][/COLOR][/I][/B][B][I][COLOR=red]1992 ZR1[/COLOR][COLOR=black] [U]#00445("The Revenant")[COLOR=red][COLOR="Black"]BLACK [/COLOR][/COLOR]/[COLOR=red]RED(2016 T.O.D!) [/COLOR] [/U][/COLOR][/I][/B] [B][I][COLOR=red]2009 [COLOR=red]Z06!![COLOR=black]BLK/BLK rare Linen interior[/COLOR] 707HP!![/COLOR] [/COLOR][/I][/B] [B][I][COLOR=red]2006[/COLOR] BLK/BLK Z51 (Just SICK FAST!)SOLD)[/I][/B] [B][I]1996 BLK/BLK LT4 Grnsprt(sold...Twice!)[/I][/B] [B][I]1991 RED/REDL98(Fell off the shipping truck:([/I][/B] [B][I]1980 BLK/RED L82(Sold)[/I][/B] [B][I][B][I]1990[/I][/B] RED/BLK(sold.....In Japan)[/I][/B] [I][COLOR=black][B][I]2006[/I][/B][/COLOR][/I] [COLOR=red]Mustang GT[/COLOR] ([B][I]mach 1[/I][/B])[B](sold)[/B] [COLOR=black][B][I]1969[/I][/B][/COLOR] [COLOR=red]Mach[/COLOR] [B][I]1(sold in Japan)[/I][/B] [COLOR=black][B][I]1969[/I][/B][/COLOR] [COLOR=red]Mach[/COLOR] [B][I]1#2(sold)[/I][/B] [B][I]WAZOO Member...[/I][/B] [url]www.evolution-motorsport.com[/url] facebook/evolutionmotorsportengineering Your Local [url]www.Amsoil.com[/url] dealer/user.. *Victory Loves Preparation* |
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04-17-2012
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#5 |
Join Date: Aug 2007
Location: Spring TX
Posts: 1,348
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Re: THIS SEEMS TO BE GOING AROUND!
When my car is warm the idle at a stop is much lower than when it first cranks up. That is for sure, and when the car is still moving I don't think it drops all the way down to that low idle. I notice it more since I have installed the headers and B&B. When it drops to the 700, (my car might be 600, barely off the 500 mark) the car sounds pretty sweet inside. I never thought i could have a problem, unless y'all say this isn't normal. Other than the 2 different idle speeds it runs perfect. Although I have a plug wire that keeps backing off the plug causing a miss every now and then.
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1994 #293 ZR-1 Stainless Works Long Tube Headers, B&B catback w/ X-Pipe, 18" Shelby Series One Wheels, SLP CAI. |
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04-17-2012
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#6 |
 Join Date: Oct 2010
Location: Rock Hill, SC
Posts: 160
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Re: THIS SEEMS TO BE GOING AROUND!
Mine is also starting to have those troubles. But my cruise will not hold the speed going up a hill. Do you have a problem with your cruise. Just wondering. I have done nothing to mine yet because it is running well and can get me to BG and back.
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'93 #166 Black Rose “Out of every one hundred men, ten shouldn't even be there, eighty are just targets, nine are the real fighters, and we are lucky to have them, for they make the battle. Ah, but the one, one is a warrior, and he will bring the others back.” Heraclitus |
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04-17-2012
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#7 | |
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Join Date: Jan 2009
Location: Portland Oregon metro area (Washington side)
Posts: 3,207
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Re: THIS SEEMS TO BE GOING AROUND!
Quote:
My #3 plug wire backs off at times. I think the seal between the cover and head is leaky.
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Scott Vett owner since 1979._It's about the car and the people |
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04-17-2012
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#8 |
 
Join Date: Dec 2003
Location: Chicagoland,IL
Posts: 2,679
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Re: THIS SEEMS TO BE GOING AROUND!
On the 42.
Did you recently change Knock sensor or take it off to fix your motor. If you have access to a scanner check for knock retard. Check the knock sensor wiring/plug or it's not melted on the header/exhaust. Pete
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'91 #1635 PoloGreen 350 LT5 11.09 @ 129.27 11.04 @ 128.86 474RWHP 400RWTQ http://www.youtube.com/watch?v=SFNFOhGGlR4 http://www.youtube.com/watch?v=ZlRIOMwaDYY https://sites.google.com/site/peteszr1garage |
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04-17-2012
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#9 |
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Join Date: Feb 2011
Location: San Marcos CA
Posts: 1,802
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Re: THIS SEEMS TO BE GOING AROUND!
The LT5 does have an 'idle hang' programmed into it. It will not drop to true idle until you get below 4 mph or so.
Theories abound, like emissions reasons and smoothness of idle control, but my personal observation on some experimentation with restricted PCV flow back to the TB and low idle targets programmed in-- is that they did it to help keep power steering pressure high enough to run 275's with the big heavy LT5 over them at low speeds. It seems a fair number of these cars have a little TB bypass leakage along with the usual PCV leaks. The idle hang strategy will make the car hard to drive if you have a high idle, but if everything is ok, it will be much better. One thing to try is to restrict the PCV hose back to the plenum and tee it off to the atmosphere. you still get PCV ventilation, but much less excess to the plenum. This will compensate for other leakages and get your IAC counts off of zero. |
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04-17-2012
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#10 |
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Join Date: Oct 2011
Location: STAFFORD VA,
Posts: 576
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Re: THIS SEEMS TO BE GOING AROUND!
Allright...shouldnt the IAC disconnected make the engine react???...when I unplug mine, nothing changes....(and its new)
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[B][I][COLOR=red]1990 ZR1[/COLOR][COLOR=black] [U]#00077 [COLOR=red]RED[/COLOR]/[COLOR=red]RED[/COLOR] (10Y022 PEP CAR) [/U][/COLOR][/I][/B][B][I][COLOR=red]1991 ZR1[/COLOR][COLOR=black] [U]#00517 ("Irene")[COLOR=red]WHITE[/COLOR]/[COLOR=red]RED-SOLD:cry:[/COLOR] [B][/B] [/U][/COLOR][/I][/B][B][I][COLOR=red]1992 ZR1[/COLOR][COLOR=black] [U]#00445("The Revenant")[COLOR=red][COLOR="Black"]BLACK [/COLOR][/COLOR]/[COLOR=red]RED(2016 T.O.D!) [/COLOR] [/U][/COLOR][/I][/B] [B][I][COLOR=red]2009 [COLOR=red]Z06!![COLOR=black]BLK/BLK rare Linen interior[/COLOR] 707HP!![/COLOR] [/COLOR][/I][/B] [B][I][COLOR=red]2006[/COLOR] BLK/BLK Z51 (Just SICK FAST!)SOLD)[/I][/B] [B][I]1996 BLK/BLK LT4 Grnsprt(sold...Twice!)[/I][/B] [B][I]1991 RED/REDL98(Fell off the shipping truck:([/I][/B] [B][I]1980 BLK/RED L82(Sold)[/I][/B] [B][I][B][I]1990[/I][/B] RED/BLK(sold.....In Japan)[/I][/B] [I][COLOR=black][B][I]2006[/I][/B][/COLOR][/I] [COLOR=red]Mustang GT[/COLOR] ([B][I]mach 1[/I][/B])[B](sold)[/B] [COLOR=black][B][I]1969[/I][/B][/COLOR] [COLOR=red]Mach[/COLOR] [B][I]1(sold in Japan)[/I][/B] [COLOR=black][B][I]1969[/I][/B][/COLOR] [COLOR=red]Mach[/COLOR] [B][I]1#2(sold)[/I][/B] [B][I]WAZOO Member...[/I][/B] [url]www.evolution-motorsport.com[/url] facebook/evolutionmotorsportengineering Your Local [url]www.Amsoil.com[/url] dealer/user.. *Victory Loves Preparation* |
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