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Effect of removing oil filler cap
Hi guys. I just spent the last 2 days driving back from Colorado to Texas with my new to me 1989 Carrera 4. It did splendid and I got nearly 1000 miles of time to start meeting my new companion. I made a stop along the way and with the engine running removed the oil filler cap (expecting to find the dip stick in there like my 3.2). I quickly found it moved to it's own location in the 3.6L, but I was confused by the behavior of the engine. There was no stumble or rpm drop when I removed the filler cap. Does the 3.6 not drop rpm when the filler cap is removed, or do I have a vacuum leak somewhere else I'm not aware of.
Oh, and a pic. 
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-- 1974 Porsche 911 Targa w/ 3.2L 1989 Porsche 964 Carrera 4 |
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05-11-2014, 07:17 PM
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Join Date: Oct 2013
Location: Prescott, AZ
Posts: 1,062
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No, it doesn't change engine speed when you loosen the oil cap. Yours sounds completely normal.
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05-11-2014, 07:22 PM
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Thanks Red Coupe. One of many differences of the 3.2 vs 3.6 I guess.
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-- 1974 Porsche 911 Targa w/ 3.2L 1989 Porsche 964 Carrera 4 |
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05-11-2014, 07:29 PM
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Registered
Join Date: May 2003
Location: Detroit (Rock City!)
Posts: 783
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Nice photo, cool car.
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'90C4 |
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05-12-2014, 06:11 AM
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Join Date: Jun 2011
Posts: 77
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I noticed the lack of rpm change as well compared to my SC. I did notice that the rpm did change a small bit with the removal of the dip stick though, with the oil cap on.
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05-30-2014, 03:02 PM
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Registered User
Join Date: Oct 2012
Location: Ontario, CANADA
Posts: 62
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I do in fact notice an RPM change with the oil cap off. Or is it when the dipstick is removed??? Better check...
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1991 964 C2 Cab. |
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06-02-2014, 07:19 AM
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Perle
