Oil Cap Vaccum

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Jul 24, 2006 | 02:17 AM

WhiteMamba

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Oil Cap Vaccum

Quick question.

After Driving my z around for a while I noticed this.. .

I pop opened my hoood, ( While the engine was idling), then
I removed the oil cap , the car seemed to stumble suddenly ... As soon as I put it back on its fine...

Is this normal.. ( I removed it a couple of times. just to check..) I did the same thing every time... It stumbles very slightly. ( It won't turn off or anything...

I even tried placing my hand over the filler cap, for a short while while the engine was idling .. then removing it.. after removing it ... It would stumble slighly also..

Also , while the OIL CAP is off , if I place my hand.. on top..I can
feel a suction ( Vaccum in my hand) .. More if I move the Throttle

Is this normal

Thanks in advance.

Jul 24, 2006 | 02:20 AM

WhiteMamba

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More info...

Noticed this when the car is idling.... at normal operating temperatures... and I open the oil cap .. The Car stumbles slightly ... You can hear a change in idle speed.

Then If I put my hand on the oil cap hole,
it creates a suction.. If I remove it it stops.... ( Changes in Idle Speed again)

Is this normal.. . Or Does this means BAD RINGS..??

My Brothers 99 Vette Does not do that.. I tried it on his..
( Had his car Idling ,then I proceeeded to take the oil cap off.
and his car did not stumble.)

Thanks