# 2010 Toyota Prius - bump during idle **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** prius, toyota\ **Created:** [January 7, 2019, 8:10pm UTC](https://community.cartalk.com/t/2010-toyota-prius-bump-during-idle/132203 "2019-01-07T20:10:35Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![DonMorton](https://avatars.discourse-cdn.com/v4/letter/d/7c8e57/32.png) [@DonMorton](https://community.cartalk.com/u/DonMorton)\ **Post date:** [January 7, 2019, 8:10pm UTC](https://community.cartalk.com/t/2010-toyota-prius-bump-during-idle/132203/1 "2019-01-07T20:10:35Z")
As you may know, the Prius has a secondary power source, a gasoline engine. I believe it is basically a Corolla engine. Sometimes when I’m idling and the secondary engine engages, there’s a “bump”. It feels like something has hit the car. One friend suggested it might be happening because of a loose engine mount. Any idea? ---
**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\ **Post date:** [January 7, 2019, 8:55pm UTC](https://community.cartalk.com/t/2010-toyota-prius-bump-during-idle/132203/2 "2019-01-07T20:55:01Z")
> [@DonMorton](#): > > the Prius has a secondary power source, a gasoline engine Actually the gas engine is the primary power source. The electric motor is secondary since this is not a plug-in hybrid, it is fueled by gas alone. Anyway, the car can drive on EV only until the battery is drained when the engine starts These cars have always had a perceptible bump when the IC engine starts up. The 2010 was better than previous years but it was still there. The car is now 9 years old and may not start as smoothly as it once did plus, yes, a mount could be failing, or just old and hard. Have it checked out. ---
**Author:** ![DonMorton](https://avatars.discourse-cdn.com/v4/letter/d/7c8e57/32.png) [@DonMorton](https://community.cartalk.com/u/DonMorton)\ **Post date:** [January 7, 2019, 9:42pm UTC](https://community.cartalk.com/t/2010-toyota-prius-bump-during-idle/132203/3 "2019-01-07T21:42:48Z")
Thanks! Don’s iPhone