on a tpi , how do you do it, just turn the screw ??? or is there a way with the adl??
chiltons and hayns arent too discriptive

-Stell

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1988 IROC 305TPI MINT!!
Mods= Accell SuperCoil, MSD 6A, Ported Plenum, No MAF Screans , K & N, 160 Thermostat+ Temp Switch
And Always Trying To Go Faster

 

It's my understanding that you have to have it put on the computer to accurately set the idle. If all you do is twist the screw, it throws the cars computer off. Because it's trying to compensate for what it thinks the idle is suppose to be, in relation to where you just set the screw at.


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"Gonad are useful for their intended purpose,
But they're no substitute for Brains!"

Redbird
Bayou Motorsports
87 Firebird
Delta Region SCCA
#68 ESP

 

I believe there's a tech article here on how to set it correctly. Something like "Adjusting Minimum Air" or "IAC Adjustment"

[This message has been edited by ViciousZ (edited October 13, 2000).]

 

Stell,

Both RB and Vicious are correct. There is a method to adjust the correct base idle position of the throttle valves, and as RedBird points out, the target idle speed of the engine is a function of the ECM programming. Regardless of what you do to change the idle speed, the ECM will attempt to maintain its programmed speed until adjustments are so far off base that an error code is set and/or idle quality suffers.

A 305 TPI automatic should have a target hot idle speed of 650 RPM in DRIVE. This speed is maintained by the IAC regardless of load from air conditioning, alternator, etc. The speed is modulated by the IAC, and the fuel injector pulses are trimmed to match the amount of intake air.

You can get a custom PROM to change the target idle speed, or live with the factory setting. If your engine doesn't idle correctly at that speed, you need to clean the IAC, set the TPS voltage, base ignition timing, and set the minimum air position of the throttle. If all the components are functioning correctly and there are no vacuum leaks, weak ignition, fuel delivery problems, etc., the engine should idle acceptably. This is based on your listing of modifications, none of which include significant valve train modifications or compression ratio adjustments. The flow improvements you've made should not affect the idle quality. If there is a specific reason for you to change from this base speed, I must have missed it.

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Later,
Vader
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"Make Me Bad"
Adobe Acrobat Reader 4.0

 

Vader,
i didnot want to change it, i have played with that screw before. so i want to make sure it was where it was suposto be just incase i have messd it up

-Stell

------------------
1988 IROC 305TPI MINT!!
Mods= Accell SuperCoil, MSD 6A, Ported Plenum, No MAF Screans , K & N, 160 Thermostat+ Temp Switch
And Always Trying To Go Faster