# 1993 Nissan Pathfinder RPM issue **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** nissan, engines\ **Created:** [December 29, 2022, 7:25pm UTC](https://community.cartalk.com/t/1993-nissan-pathfinder-rpm-issue/188200 "2022-12-29T19:25:59Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![hectorhermida](https://avatars.discourse-cdn.com/v4/letter/h/6a8cbe/32.png) [@hectorhermida](https://community.cartalk.com/u/hectorhermida)\ **Post date:** [December 29, 2022, 7:26pm UTC](https://community.cartalk.com/t/1993-nissan-pathfinder-rpm-issue/188200/1 "2022-12-29T19:26:00Z")
Engine raises and lowers between 1500 and 2000 rpms. ---
**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:** [December 29, 2022, 8:47pm UTC](https://community.cartalk.com/t/1993-nissan-pathfinder-rpm-issue/188200/2 "2022-12-29T20:47:38Z")
I presume you mean it does this idling the engine in the driveway. When this happens is the coolant up to normal operating temperature, engine warmed-up in other words, or does this happen only when first starting the engine, coolant cold? ---
**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:** [December 29, 2022, 9:26pm UTC](https://community.cartalk.com/t/1993-nissan-pathfinder-rpm-issue/188200/3 "2022-12-29T21:26:27Z")
If you are talking about the engine surging, then try cleaning the throttle body… ![image](https://global.discourse-cdn.com/cartalk/original/3X/3/3/33e51ccfab899315b9348e5b93a8c713a188be69.jpeg) If you mean you see the engine lifting up and down, then you have bad motor mounts. ---
**Author:** ![old\_mopar\_guy](https://avatars.discourse-cdn.com/v4/letter/o/6bbea6/32.png) [@old\_mopar\_guy](https://community.cartalk.com/u/old_mopar_guy)\ **Post date:** [December 31, 2022, 2:43am UTC](https://community.cartalk.com/t/1993-nissan-pathfinder-rpm-issue/188200/4 "2022-12-31T02:43:40Z")
Eithe replace your idle air control, or. If you dont have one, have your throttle body cleaned. ---
**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:** [December 31, 2022, 11:16pm UTC](https://community.cartalk.com/t/1993-nissan-pathfinder-rpm-issue/188200/5 "2022-12-31T23:16:50Z")
I had same problem on my similar-vintage Corolla one time. Discovered idle rpm control for coolant temp gadget failed. Works similar to a coolant system thermostat, wax expands/contracts with coolant temp, and opens/closes air-valve. On Corolla that part isn’t replaceable, have to replace entire throttle body. I mitigated the problem by blocking off that air-pathway, so now in unusually cold ambient temperatures have to press on the gas pedal a little to keep engine from stalling for a couple minutes until engine warmed up. Fortunately ambient temps that cold are rare in San Jose. ---
**Author:** ![WayneDresdin4](https://avatars.discourse-cdn.com/v4/letter/w/e480ec/32.png) [@WayneDresdin4](https://community.cartalk.com/u/WayneDresdin4)\ **Post date:** [January 2, 2023, 2:12am UTC](https://community.cartalk.com/t/1993-nissan-pathfinder-rpm-issue/188200/6 "2023-01-02T02:12:47Z")
How’d you block it off? ---
**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:** [January 3, 2023, 8:16pm UTC](https://community.cartalk.com/t/1993-nissan-pathfinder-rpm-issue/188200/7 "2023-01-03T20:16:20Z")
Suggest not to try this yourself. Ask your mechanic if such a thing is possible given your car’s configuration.