Quote:
Originally Posted by robert walsh
Why do the rpm's drop when you open the oil filler cap and why does the volume on the dip stick change change after several mineuts of sitting? I understand waiting 2-3 mins on level ground, but wait 4-5 and I get a better reading, at least higher.
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When the oil cap is opened it releases the pressure and vacuum at the air box and lowers the RPMs.
This is an easy way to tell if your CIS has a vacuum leak somewhere, if you remove the oil cap and the rpms don't drop your engine is adjusted to idle to high or you have a vacuum leak at the cap or somewhere else.
On an engine requiring no vacuum the rpms should not change when the oil cap is removed.
Edit: I just read your other post about oil level, I dont know why your level would increase with time.
Shane
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78’ SC 911 Targa - 3.2SS, PMO 46, M&K 2/2 1 5/8” HEADERS, 123 DIST, PORTERFIELD R4-S PADS, KR75 CAMS, REBEL RACING BUSHINGS, KONI CLASSICS
Last edited by snbush67; 01-06-2010 at 10:47 AM..
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