# 1984 Porsche 911 loses power

**URL:** <https://community.cartalk.com/t/1984-porsche-911-loses-power/162492>\
**Category:** Maintenance/Repairs\
**Tags:** 911, porsche\
**Created:** [April 5, 2020, 9:43pm UTC](https://community.cartalk.com/t/1984-porsche-911-loses-power/162492 "2020-04-05T21:43:08Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Burnett](https://avatars.discourse-cdn.com/v4/letter/b/f0a364/32.png) [@Burnett](https://community.cartalk.com/u/Burnett)\
**Post date:** [April 5, 2020, 9:43pm UTC](https://community.cartalk.com/t/1984-porsche-911-loses-power/162492/1 "2020-04-05T21:43:09Z")

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My engine is losing power and when I took the oil filler cap off the engine stalled out. I did it twice with the same result. What could my problem be?

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**Author:** ![texases](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/texases/32/862_2.png) [@texases](https://community.cartalk.com/u/texases)\
**Post date:** [April 6, 2020, 1:53am UTC](https://community.cartalk.com/t/1984-porsche-911-loses-power/162492/2 "2020-04-06T01:53:29Z")

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I hope you find someone here that knows. You might post this on a 911 forum.

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**Author:** ![davepsinbox\_157004](https://avatars.discourse-cdn.com/v4/letter/d/73ab20/32.png) [@davepsinbox\_157004](https://community.cartalk.com/u/davepsinbox_157004)\
**Post date:** [April 6, 2020, 2:15am UTC](https://community.cartalk.com/t/1984-porsche-911-loses-power/162492/3 "2020-04-06T02:15:31Z")

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My top of the head guess would be the PCV system.

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**Author:** ![wolyrobb](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/wolyrobb/32/45497_2.png) [@wolyrobb](https://community.cartalk.com/u/wolyrobb)\
**Post date:** [April 6, 2020, 6:04am UTC](https://community.cartalk.com/t/1984-porsche-911-loses-power/162492/4 "2020-04-06T06:04:55Z")

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Seems to be a common enough problem on these cars, according to various forums. Caused if a restrictor for the oil tank breather hose is missing. Or there’s a worse vaccum leak than is caused just by removing the oil cap.

> **[Porsche Restrictor for Oil Tank Breather Hose O.E.M. 930-107-289-00...](https://www.pelicanparts.com/More_Info/93010728900.htm?pn=930-107-289-00-M260)**
>
> O.E.M. Restrictor for Oil Tank Breather Hose $22.50. Call (888)280-7799. May Qualify For FREE SHIPPING. Parts# 930 107 289 00 930-107-289-00 930.107.289.00 93010728900.

> **[Carrera 3.2 - engine dies when oil cap is opened - Pelican Parts Forums](http://forums.pelicanparts.com/porsche-911-technical-forum/971900-carrera-3-2-engine-dies-when-oil-cap-opened.html)**
>
> Pelican Parts Forums