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How do I 'set' the TPS and IAC...93 LT-1 ?

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Old 12-20-2003, 12:41 PM   #1
dizwiz24
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Default How do I 'set' the TPS and IAC...93 LT-1 ?

Someone mentioned they set their TPS and IAC and their car has never run better. I asked them how to do it, and they never responded back.

Recently I put a new TPS sensor in, at WOT the new TPS registered 4.06 volts which showed 99% throttle position on my Auto XRay scantool.

However, my old TPS sensor showed 4.62 volts at WOT and 99% throttle position on my auto xray.

I figure I might be 'ok' because it still shows 99% throttle (somehow my ECM learned that 4.06 volts meant WOT)

However, I am still curious as to how one 'sets' both IAC and TPS

I should mention my car always seems rich, with its current mods, at idle.

I have a 93 LT-1 w/hot cam kit, ed wright chip, LT headers, no cats.


Any help would be appreciated,

Dave
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Old 12-20-2003, 01:02 PM   #2
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Default Re: How do I 'set' the TPS and IAC...93 LT-1 ? (dizwiz24)

I think your TPS is the same as the one on my 92. In which case, it is non- adjustable. According to the Helms, it is self zeroing (0% open at idle) at .3-.9v. ...it does mention that if a new TPS is installed, the TECH 1 unit (@ the dlr unless you just happen to have one around the house :D ) will reset it for ASR functions.


[Modified by ittlfly, 10:28 AM 12/20/2003]
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Old 12-20-2003, 01:11 PM   #3
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Default Re: How do I 'set' the TPS and IAC...93 LT-1 ? (dizwiz24)

The methods for setting IAC & TPS are on my site (link in sig. below) but, as mentioned, your TPS is not adjustable though the ECM still uses OBD-I.

Beginning in '90, even if you cut adjusting slots into the TPS mount the ECM will simply override any "tweaks".
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Old 12-20-2003, 04:02 PM   #4
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Default Re: How do I 'set' the TPS and IAC...93 LT-1 ? (65Z01)

65Z01 I cant see your signature, can you post the link.

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Old 12-20-2003, 04:19 PM   #5
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Default Re: How do I 'set' the TPS and IAC...93 LT-1 ? (dizwiz24)

diz, TPS is not adjustable as mentioned earlier. However IAC is adjusted by the following. Pg 6E3-C2-5 (VIN P):

The IAC valve can be reset by doing the following: depress accelerator pedal slightly, start and run engine for five seconds, then turn ignition "off" for ten seconds.
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