LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Is it Open Loop when SES light comes on?

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Old 07-28-2006, 10:14 AM
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Is it Open Loop when SES light comes on?

Car runs in closed loop while driving, and then if the SES light comes on, fans come on and it goes into open loop correct?

Also, past 75% throttle it goes into open loop as well?

Thanks.
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Old 07-28-2006, 11:25 AM
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Re: Is it Open Loop when SES light comes on?

To my knowledge you car will be in open loop when the engine is cold (not sure what temp), when the SES light is on and above a certain throttle position (not sure of %).
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Old 07-28-2006, 12:13 PM
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Re: Is it Open Loop when SES light comes on?

AFAIK, it stays in closed loop when the SES is on. It does not go into open loop at 75% throttle. High throttle will cause it to go into power enrichment mode (which a lot of people mistake for open loop).
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Old 07-28-2006, 02:10 PM
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Re: Is it Open Loop when SES light comes on?

Shoebox is correct.
Originally Posted by shoebox
High throttle will cause it to go into power enrichment mode (which a lot of people mistake for open loop).
It's almost open loop.
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