My Swift idles low when in reverse or drive

NoWine · Jan 31, 2025

Hello everyone.
I had to replace the spark plugs, valve cover gasket, filters, and throttle body on my car. After that, the car starts and idles fine in park (around 800 rpm). However, in drive, the revs drop to around 400-500 rpm, and it vibrates. When the AC is on, the revs go up to 800 rpm.
There are no codes or check engine light. Is this normal, or could something still be wrong?

SuzukiDriver2024 · Feb 5, 2025

Have you had any fixes to do on the throttle body recently?

mysidekickplan · 2025-02-27T18:50:22-0600

That low idle in drive, how the AC fixes it is definitely a problem. It's likely your idle control system is messed up when the engine's loaded. Since you touched the throttle body it might need a good cleaning and a reset even if it looks clean. check all those vacuum hoses especially near the throttle body for leaks. Even with no codes a scan tool that shows live data could find issues with your idle air or mass airflow sensors. It's probably just a messed-up idle control thing.

carspoTTer · 2025-02-27T23:32:21-0600

If you're messing with the throttle body, you gotta do an idle relearn afaik. You should consider it.

My Swift idles low when in reverse or drive

Help Support Suzuki Swift Forum:

NoWine

Member

SuzukiDriver2024

Active member

mysidekickplan

New member

carspoTTer

New member

Join the Suzuki Swift Community

Latest posts