# Leak down tester issues

**URL:** <https://community.cartalk.com/t/leak-down-tester-issues/89590>\
**Category:** Maintenance/Repairs\
**Created:** [April 8, 2015, 4:28am UTC](https://community.cartalk.com/t/leak-down-tester-issues/89590 "2015-04-08T04:28:00Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![seagates5](https://avatars.discourse-cdn.com/v4/letter/s/e480ec/32.png) [@seagates5](https://community.cartalk.com/u/seagates5)\
**Post date:** [April 8, 2015, 4:28am UTC](https://community.cartalk.com/t/leak-down-tester-issues/89590/1 "2015-04-08T04:28:00Z")

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Im not sure if my tester is giving me correct readings. I zeroing the dial correctly but when I repeat the readings the per cent keeps changing. I tried ir not connected to the spark plug hole and its showing 50% and that makes no sense it should be 80 or higher correct?