# Engine slightly revving up on highway **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** engines\ **Created:** [November 29, 2007, 11:18am UTC](https://community.cartalk.com/t/engine-slightly-revving-up-on-highway/7802 "2007-11-29T11:18:22Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Nexus321](https://avatars.discourse-cdn.com/v4/letter/n/6bbea6/32.png) [@Nexus321](https://community.cartalk.com/u/Nexus321)\ **Post date:** [November 29, 2007, 11:18am UTC](https://community.cartalk.com/t/engine-slightly-revving-up-on-highway/7802/1 "2007-11-29T11:18:22Z")
I own a 2001 Chevy Malibu with a V6. The problem I am having is the engine is slightly revving up on the highway. It is most apparent when I am going 70mph. The RPM will be at a steady 2000 (at 70mph) then will jump up to about 2300-2400rpm for about 2-3 seconds and go back down. There is not pattern to it either. It may do it again a few seconds or a few minutes later. If I even stay a few mph under 70mph it seems to make a difference but after driving long enough (say 2-3 hours highway driving time)the problem will creep in while driving 60. At slow city driving though I have never noticed it. It also does not matter if the weather is hot or cold. Does anyone have any ideas or had this same problem? ---
**Author:** ![Joseph\_E\_Meehan](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/joseph_e_meehan/32/21_2.png) [@Joseph\_E\_Meehan](https://community.cartalk.com/u/Joseph_E_Meehan)\ **Post date:** [November 29, 2007, 12:41pm UTC](https://community.cartalk.com/t/engine-slightly-revving-up-on-highway/7802/2 "2007-11-29T12:41:01Z")
Auto or manual transmission? It appears you are seeing a tach show an increase RPM do you also hear or feel an increased RPM? If Auto I would suggest checking the fluid first making sure it is in good condition and full. With a 2001 car (what mileage) I would guess it is about time to change the fluid and clean the filter. If you have not done that, now would be a good time. Note. If it is the transmission, and if you do change the fluid, remember that the damage may have already been done. If it fails 6 months later, it did not fail because of the fluid change, it may have failed because of the lack of an earlier change. ---
**Author:** ![mr\_josh](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mr_josh/32/3008_2.png) [@mr\_josh](https://community.cartalk.com/u/mr_josh)\ **Post date:** [November 29, 2007, 1:35pm UTC](https://community.cartalk.com/t/engine-slightly-revving-up-on-highway/7802/3 "2007-11-29T13:35:12Z")
It sounds like the torque converter locking and unlocking which can be a few different things. If you took it to a reputable transmission shop (ie not AAMCO), described the problem, and suggested that it was the TCC locking and unlocking, they’d know right where to look.