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

surging

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Old Apr 3, 2010 | 03:22 PM
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Default surging

hello working on my prob today plugged in scanner and all of a sudden scanner says computer is in open loop with a lean mix any ideas?
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Old Apr 3, 2010 | 03:34 PM
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If the engine's surging and you're getting a lean indication reading, those match. Surging is usually the result of a lean condition.

You'll need to first check for a vacuum leak. Could be somewhere in the intake tract, exhaust up-stream of the 02(s) or the EGR to begin with.

Jake
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Old Apr 3, 2010 | 05:06 PM
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Default open loop issue

scanner says its in open loop will a temp sender make it stay in open loop? also says its lean but engine is at oper temp
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Old Apr 4, 2010 | 08:08 PM
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Default open loop issue

hello well i have stumbled across my open loop issue for some reason my temp sender went bad I replaced it and comp went right into closed loop now scanner toggles from lean to rich like it should it fixed most ot=f my surging issue also however it still surges at idle from about 600-675 rpm other than that it seems to be doing allright for now thanks for everyones info.
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