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#1 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,696
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There's been several threads whee this topic comes up. I had documented it as part of another thread but thought I would set it up for its own to make it easier to find. Would make a good sticky.
OK. Here goes: As for setting the IAC count for Minimum Air, the procedure I follow is: (Do this procedure once you have warmed motor to C/L operating temps. otherwise it may very well not idle. Also, you will have converted your throttle stop stud to a hex bolt I think a 7mm hex head.) 1. Jumper the ALDL as you would for reading codes. 2. Turn ignition to ON, not start. 3. Leaving ignition ON, remove the IAC harness connector. This fully extends the IAC pintle and closes off the IAC port. 4. Shut ignition OFF and remove the ALDL jumper. 5. Start the motor and get it to idle. May need to use a bit of throttle at first. 6. Check idle rpm. Turn the throttle stop screw until the motor is idling at an rpm just below what your target idle rpm. I want my idle at 875-900, so I set Min Air throttle at 800-825rpm. You may need to adjust TPS Voltage so that ECM stays within idle TPS Voltage range. 7.Tighten everything up and shutoff motor. 8. Plug in IAC. I also undo the negative BATT cable to drain the ECM memory. 9. Reconnect BATT turn ignition ON, and check TPS V. Adjust to .53-.57v if necessary. 10. Start motor and quickly raise to ~2000rpm for a brief period. This resets the IAC. 11. Shutoff motor, then restart. Allow motor to idle down and check your IAC counts and your TPS Volt which may need to be adjusted one more time.
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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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#2 | |
![]() ![]() Join Date: Aug 2009
Location: South Dakota/California
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![]() ![]() In -Solutions- Page #4 under THROTTLE BODY AND AIR INTAKE Air Idle Adjustment TIPS
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#3 |
![]() Join Date: Mar 2014
Location: Warrington PA
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Thanks very much for posting the procedure. Tried looking up the info as you mentioned, but no luck. So this comes in very handy....
![]() ![]() I also am assuming that the "nut" is permanently attached to the bracket and only the stud gets removed in order to thread in the 7mm hex head bolt, correct???
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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 Last edited by Roadster; 04-26-2017 at 11:47 AM. |
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#4 |
![]() Join Date: Apr 2007
Location: Northern VA
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Tom,
The nut is not attached. Getting the old Allen set screw out can be a real pain. Spare the drama and remove the TB and do it on the bench. If the set screw fights backing out go the other way and screw it all the way through the other direction. Be sure to hit it with some penetrating oil.
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Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake |
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#5 |
![]() Join Date: Mar 2014
Location: Warrington PA
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Appreciate the reply Phil, sounds like the way to go....I might just try one more thing before removing the TB....thanks...
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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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#6 | |
![]() Join Date: Mar 2014
Location: Warrington PA
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Taking your advice and going to remove the TB within a few days. Hopefully I'll get it all right and idling just fine!!! ![]()
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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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#7 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,696
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Here's a pic of my throttle stop.
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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 Last edited by XfireZ51; 03-08-2024 at 02:10 PM. |
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#8 |
![]() Join Date: Mar 2014
Location: Warrington PA
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Thank you sir, have seen that on mine and as said a real PIA to get to with everything attached.
Some simple questions.... 1- other than removing the IAC, TPS connectors and various hoses, can the throttle cable assembly come off with the one Torx 25 screw that is above the throttle stop screw and along with the 2 cable screws attached to the plenum? 2- and since everything is still together, will the cable need to be re adjusted when assembled? Been looking through the FSM, but couldn't find what I was looking for!!! thanks for any info......
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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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#9 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,696
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Except that mine shows the 7mm hex head installed.
You need to unplug IAC harness connector and TPS connector but should be able to able to work w TB without disconnecting cable throttle cable. Obviously the airhorn comes off also along w undoing the throttle cable retainers on the plenum.
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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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#10 |
![]() Join Date: Mar 2014
Location: Warrington PA
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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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