# Trucks loud and knocks after exiting car wash

**URL:** <https://community.cartalk.com/t/trucks-loud-and-knocks-after-exiting-car-wash/42821>\
**Category:** Maintenance/Repairs\
**Tags:** dakota, dodge\
**Created:** [January 19, 2010, 1:49am UTC](https://community.cartalk.com/t/trucks-loud-and-knocks-after-exiting-car-wash/42821 "2010-01-19T01:49:24Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![dadockter](https://avatars.discourse-cdn.com/v4/letter/d/67e7ee/32.png) [@dadockter](https://community.cartalk.com/u/dadockter)\
**Post date:** [January 19, 2010, 1:49am UTC](https://community.cartalk.com/t/trucks-loud-and-knocks-after-exiting-car-wash/42821/1 "2010-01-19T01:49:24Z")

</div>

The past several times I’ve gone through a car wash, the engine was very loud (almost like no muffler) and was knocking upon startup and exiting the car wash. After a few minutes it cleared up. Any ideas what this is?