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Valve cover vacuum leaks?

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91-gsx

15+ Year Contributor
932
11
Mar 31, 2005
San Jose, California
Hi, it seems I have a low airflow reading at idle when logged with dsmlink. I was wondering if the pvc system might be drawing air in through the valve cover gasket and oil cap? Has anybody experienced this or think that it is probable? The valve cover gasket is leaking a little oil, so it might be leaking vacuum at idle as well.. I have checked the other possibilities like the intake manifold, throttle body, couplers, intake, turbo.. I checked them using smoke, like the way you would use dry ice to check for leaks quickly. None of the smoke was drawn in during idle, and under light throttle. I did not think of smoke testing the valve cover at the time. Thanks for the help and any input is appreciated.
 
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