# Valve rattle or pre ignition knock please help

**URL:** <https://community.cartalk.com/t/valve-rattle-or-pre-ignition-knock-please-help/36638>\
**Category:** Maintenance/Repairs\
**Tags:** nissan, valves, maxima\
**Created:** [September 14, 2009, 9:04pm UTC](https://community.cartalk.com/t/valve-rattle-or-pre-ignition-knock-please-help/36638 "2009-09-14T21:04:02Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![gfiechtner](https://avatars.discourse-cdn.com/v4/letter/g/ed8c4c/32.png) [@gfiechtner](https://community.cartalk.com/u/gfiechtner)\
**Post date:** [September 14, 2009, 9:04pm UTC](https://community.cartalk.com/t/valve-rattle-or-pre-ignition-knock-please-help/36638/1 "2009-09-14T21:04:02Z")

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I have a 2003 nissan maxima with the 6 cylinder and during take off and going up hill i get this rattle between 1500 to 2500 rpm. No one can seem to give me a answer to fix it.

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**Author:** ![MikeInNH](https://avatars.discourse-cdn.com/v4/letter/m/a587f6/32.png) [@MikeInNH](https://community.cartalk.com/u/MikeInNH)\
**Post date:** [September 14, 2009, 9:08pm UTC](https://community.cartalk.com/t/valve-rattle-or-pre-ignition-knock-please-help/36638/2 "2009-09-14T21:08:59Z")

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Usually you can tell by listening to it. They are distinctive sounds. I’m surprised an experienced mechanic can’t determine what’s making the sound.

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**Author:** ![UncleTurbo](https://avatars.discourse-cdn.com/v4/letter/u/e9a140/32.png) [@UncleTurbo](https://community.cartalk.com/u/UncleTurbo)\
**Post date:** [September 14, 2009, 9:13pm UTC](https://community.cartalk.com/t/valve-rattle-or-pre-ignition-knock-please-help/36638/3 "2009-09-14T21:13:49Z")

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What grade of gas are you using? Does the owner’s manual specify “premium required” or “premium recommended” for this motor?