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#11 |
![]() Join Date: Mar 2014
Location: Warrington PA
Posts: 1,913
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Just removed the TB, on my way to get the 7mm hex bolt...making progress....
Sent from my SM-G935P using ZR-1 Net Registry mobile app
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Tom 1994 ZR-1 #009 "captured test fleet car" 1974 LS4 454 Vert 1982 L83 CFI...now a retired "dd"....Sold WAZOO Member |
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#12 |
![]() Join Date: Aug 2015
Location: Pittsburgh, PA
Posts: 152
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I know this is an old thread but just went through this procedure and it worked great for me so wanted to give a shout out to Dom and Phil for the procedure and tips. Thanks!
The only exception I ran into is that the 25mm long Hex head idle stop screw was a bit long in my case and the head was barely clearing one of the TB brackets when the throttles are almost full open so I used a 20mm long screw. When I started, my IAC counts were 30 at idle. Now they are 10-12. Thanks again.
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Roger 1990 ZR-1 #2699 Black on Black 15,000 miles Full-time secondaries, 4.10 gears, C-beam plates, ported top end |
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#13 | |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,697
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[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 |
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#14 | |
![]() Join Date: Aug 2015
Location: Pittsburgh, PA
Posts: 152
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After finishing the idle setup yesterday, went for a drive today and drove perfectly - idle did not drop too low when taking my foot off the pedal and never died after an hour of driving and probably 2 dozen stops. One more thing I will mention is that my original throttle stop screw measured 7.6mm extension from the mounting tab. I installed the new Hex head screw about 8mm extension (because I wanted more air through primary blade/less IAC counts) and this put me within a half-turn of my final adjustment.
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Roger 1990 ZR-1 #2699 Black on Black 15,000 miles Full-time secondaries, 4.10 gears, C-beam plates, ported top end |
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#15 |
![]() Join Date: Jan 2024
Location: Boston, MA
Posts: 170
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Digging up an old thread as I work through some stalling issues when coming to a stop before I go grab a data log. I realize this may be a "it depends" question, but is there a rough number of IAC steps one should expect to see with foot off the throttle at idle? I see BlackZR1 went from ~30 to 10-12 after following the procedure.
Thank you.
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1987: Z51 Coupe, Z51, 4+3, Yellow / Graphite 1994: ZR-1 #150, Admiral Blue / Black 2015: Z06 Coupe, Z07, M7, Arctic White / Red |
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#16 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,697
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U want enough IAC steps so ECM has room to ?catch? idle drop, but not too many steps to where most of idle air is coming thru IAC opening. I typically shoot for 10-15 steps. One other step I do is to modify the IAC Min Air table in the calibration to match what the actual IAC counts are in operation.
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[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 |
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#17 | |
![]() Join Date: Jan 2024
Location: Boston, MA
Posts: 170
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On a cold start when the desired idle is still 1250 it looks like IAC is at 110. Once warm and desired idle of 850 the steps are around 30-40.
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1987: Z51 Coupe, Z51, 4+3, Yellow / Graphite 1994: ZR-1 #150, Admiral Blue / Black 2015: Z06 Coupe, Z07, M7, Arctic White / Red |
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#18 | |
![]() Join Date: Jan 2024
Location: Boston, MA
Posts: 170
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Looks like it is in my best interests to go through the IAC procedure anyway and see where I land. Currently it is mostly the same as the stock BMCB with a couple changes. Code:
Deg C / Deg F / Steps -40 / -40 / 95 -16 / 3 / 78 (Stock BCMB value is 90) 8 / 46 / 51 (Stock BCMB value is 32) 32 / 90 / 24 (Stock BCMB value is 12) 56 / 133 / 10 80 / 176 / 10 104 / 219 / 13 128 / 262 / 25 152 / 306 / 45 |
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#19 |
![]() Join Date: Jan 2024
Location: Boston, MA
Posts: 170
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One small note for any future people. I was having trouble with this procedure as I didn't use the correct ALDL pin combo on my 94 to extend the pintle. I needed to use pins 4 & 6 to use the Service Engine Soon light to flash. Only this combo fully extended the IAC pintle on my 94. The other ALDL pin combos for CCM on the digital dash or the flashing Service Ride Control light do not work to extend it.
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1987: Z51 Coupe, Z51, 4+3, Yellow / Graphite 1994: ZR-1 #150, Admiral Blue / Black 2015: Z06 Coupe, Z07, M7, Arctic White / Red |
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#20 | |
Join Date: Aug 2005
Location: Fishers, IN
Posts: 809
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I feel like I knew this at one time, but was this a model year change, regarding the ALDL pin combination for the IaC? If so, when did it change? Sent from my iPhone using ZR-1 Net Registry
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Todd ____________________________________ *** our email address has changed! info@pepmeierengines.com pepmeierengines.com Friend us on Facebook too: www.facebook.com/profile.php?id=100011443683384 Pepmeier Engine Development |
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