i have a scan tool and it's telling me desired idle is 775 rpm's.Does this sound about right.Just curious what you other guy are at.

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1991 1LE Z28 355cu 5SPD (ORIGINALLY 305 BEST E.T. 14.186@99.86mph)NO PASSES ON 355 YET.MINI RAM INTAKE,AFR 190 HEADS,10.23:1cr 24# SVO INJECTORS,BBK 52mmTB,AFPR
FULL ROLLER MOTOR,1.6 rockers MSD 6AL
AUTOMETER A/F GAGUE MARCH PULLEYS,HEDDMEN HEADERS 3IN EXH NO CATS FLOWMASTER,POWER TRAX NO-SLIP LOCKER,3:42 GEARS,LAKEWOOD LOWER CONTROL ARMS HOTCHIKS STRUTTOWER BRACE,COMPETTION ENG.SUBFRAME CONNECTORS
MALLORY TACH W/SHIFT LITE
BLACK, TINTED WINDOWS, TAIL LIGHT COVERS BIG BLOCK COWL INDUCTION HOOD,SHAVED DOOR HANDLES

67RS 327cu 92K ORIG MILES.NEWER GM HEADS HEADERS,650 HOLLEY CARB,CAM, 350 TURBO TRANS W/SHIFT KIT&COOLER 12 BOLT POSI 3.73'S MUTLILEAF SPRINGS
NEW VINYLROOF&CARPET, COWL HOOD,HIDE AWAY HEAD LITES,

 

that sounds about right. what scan tool are you using?

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91 Z28 slp headers adj reg accell cap rotor coil comp cam roller
random tech cats flowmaster catback
new motor in

 

it would be a Auto Scan X-Ray.You can get it out of Summit for $175+ shipping p/n (AXY-10110).Its a Gm only scan.It's not to bad for the money.

 

well it depends on what your computer is and such...if it's stock or modifed..what kinda prom you run...etc.

i own an 87 T/A stock system.
for it, i read the spec. and from what i find,
on a cold start the car should idle at 1500rpms, it would then drop as the car warms up...
when the car is fully warmed and your at idle it should run around 500rpms..in drive.
in park it should run around 800rpms and if the car is in neutral it should run 800rpms as well.
that's of couse if the car is auto like mine is....
if the car is in neutral it should be around 800rpms..
these are specs. for an 87, stock 305 TPI, auto. T/A.

 

Hey, Chief,

You realize that the only way to properly change the target idle is to reprogram the PROM, right? Adjusting the throttle stop screw will only ruin the minimum air position setting and confuse the ECM to the point that the IAC can no longer correctly control the idle.

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Later,
Vader
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"Let the bodies hit the floor!"
Adobe Acrobat Reader

 

Mines at 600 idle and 550 in drive.

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89 FORMULA 350
99 Grand Prix GT

 

400 in drive, barley idles but hasn't stalled yet and sounds cool, about 550 in park, but who says stock TACH is accurate.

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88' GTA 350 MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass

 

I take it your referring to to the tareget idle vs coolant temp right.


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1991 1LE Z28 355cu 5SPD (ORIGINALLY 305 BEST E.T. 14.186@99.86mph)NO PASSES ON 355 YET.MINI RAM INTAKE,AFR 190 HEADS,10.23:1cr 24# SVO INJECTORS,BBK 52mmTB,AFPR
FULL ROLLER MOTOR,1.6 rockers MSD 6AL
AUTOMETER A/F GAGUE MARCH PULLEYS,HEDDMEN HEADERS 3IN EXH NO CATS FLOWMASTER,POWER TRAX NO-SLIP LOCKER,3:42 GEARS,LAKEWOOD LOWER CONTROL ARMS HOTCHIKS STRUTTOWER BRACE,COMPETTION ENG.SUBFRAME CONNECTORS
MALLORY TACH W/SHIFT LITE
BLACK, TINTED WINDOWS, TAIL LIGHT COVERS BIG BLOCK COWL INDUCTION HOOD,SHAVED DOOR HANDLES

67RS 327cu 92K ORIG MILES.NEWER GM HEADS HEADERS,650 HOLLEY CARB,CAM, 350 TURBO TRANS W/SHIFT KIT&COOLER 12 BOLT POSI 3.73'S MUTLILEAF SPRINGS
NEW VINYLROOF&CARPET, COWL HOOD,HIDE AWAY HEAD LITES,

 

about the stock tach being accurate,mine is 400 rpms off(BEHIND)More at times.that is according to my scan tool anyway.my tach says I'm idling around 1100 but it's at 730 or so.