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

Timming issues

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Old Feb 9, 2009 | 04:47 PM
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corvettewiz18's Avatar
corvettewiz18
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Default Timing issues

What would cause the timing to jump around at idle. The shops diacom is showing timing at 12-15 then jumps to 25 then down to 12 then up to 17 and so forth. It just wants to die at idle. But when you drive timing stays fine??

Last edited by corvettewiz18; Feb 9, 2009 at 09:40 PM.
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Old Feb 9, 2009 | 05:06 PM
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Did you disconnect the EST wire first, if not the timing will move around. It needs to be disconnected to set base timing.
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Old Feb 9, 2009 | 08:11 PM
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yes they tried that
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