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

91 L98 Throtle Body Vacuum

 
Old 05-14-2019, 01:37 PM
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jph46
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Default 91 L98 Throtle Body Vacuum

Hi guys.....been helping a friend his 91 L98, NOX reading really high at smog check. Replaced the EGR valve, checked for any blockage in the. Intake, and replaced the EGR solenoid. Question is: at idle is there any measure of vacuum at the throttle body fitting on the bottom of TB? Does the vacuum depend on the RPM of the motor?
Thanks
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Old 05-14-2019, 06:43 PM
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65Z01
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I've seen that manifold vac. will vary some with engine RPM.

Does it go into closed loop, is the mixture rich, lean or normal?? Diagnostic mode will show these parameters.
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Old 05-17-2019, 11:54 PM
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jph46
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Will check it early next week, let you know what I find. Thanks
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