C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

How many seconds to wait before going into closed loop?

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Old Apr 30, 2014 | 07:52 PM
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Default How many seconds to wait before going into closed loop?

Hey guys, I have a 1985 Corvette with a Heated Oxygen Sensor conversion, how long should I set my timers to enable closed loop?

Thanks!
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Old Apr 30, 2014 | 08:58 PM
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As shown in the constants table.

Cold 300 seconds
Warm 200 seconds
Hot 100 seconds

Ecm must see at least 40.25C prior to any closed loop operation.
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Old May 1, 2014 | 03:25 PM
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mine hlh 85 vette .bin says 50 seconds hot,the same for cold and warm

[IMG][/IMG]

Last edited by tunedport85inject; May 3, 2014 at 07:15 AM.
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Old May 2, 2014 | 09:00 PM
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I have timed it many times and read the FSM on the requirements it takes for it. It is different all the time. Just depends on the starting engine temperature that day and how fast the O2 sensors start to do full swing. Don’t think there is any one correct right time answer.
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Old May 2, 2014 | 10:58 PM
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Originally Posted by pcolt94
I have timed it many times and read the FSM on the requirements it takes for it. It is different all the time. Just depends on the starting engine temperature that day and how fast the O2 sensors start to do full swing. Don’t think there is any one correct right time answer.
That isnt what he's talking about.

There are timers in the program that must lapse before it'll ever fall into closed loop, independent of what temp the O2 has reached to send correct voltages.

These I'd leave at the stock setting.
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Old May 3, 2014 | 02:24 PM
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Got it.
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