# 2001 Toyota Corolla - Lean cylinder misfire help request **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** toyota\ **Created:** [May 5, 2022, 5:41pm UTC](https://community.cartalk.com/t/2001-toyota-corolla-lean-cylinder-misfire-help-request/184010 "2022-05-05T17:41:58Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![DavidBailey56](https://avatars.discourse-cdn.com/v4/letter/d/dec6dc/32.png) [@DavidBailey56](https://community.cartalk.com/u/DavidBailey56)\ **Post date:** [May 5, 2022, 5:41pm UTC](https://community.cartalk.com/t/2001-toyota-corolla-lean-cylinder-misfire-help-request/184010/1 "2022-05-05T17:41:58Z")
multi missfire bank one lean ---
**Author:** ![weekend-warrior](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/weekend-warrior/32/26122_2.png) [@weekend-warrior](https://community.cartalk.com/u/weekend-warrior)\ **Post date:** [May 5, 2022, 7:10pm UTC](https://community.cartalk.com/t/2001-toyota-corolla-lean-cylinder-misfire-help-request/184010/2 "2022-05-05T19:10:04Z")
My crystal ball says… with the limited info you gave you probably have a vacuum leak. most likely a intake manifold gasket leak. ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [May 5, 2022, 9:55pm UTC](https://community.cartalk.com/t/2001-toyota-corolla-lean-cylinder-misfire-help-request/184010/3 "2022-05-05T21:55:55Z")
Any vacuum hoses appear to have come loose, laying around not connected to anything, or attached to a broken connector? Check especially the vacuum hose connected to the brake booster and the pcv system related hoses. If your car uses a vacuum modulated fuel pressure regular, check that too. If nothing obvious found, I expect you’ll need to hire a shop to do a thorough vacuum system check-up.