Answer
Sep 03, 2025 - 09:22 PM
Yeah, that’s actually pretty normal on a Suzuki APV — or most cars, really. When the engine’s cold, the ECU bumps up the idle to help it warm up faster. Once the engine reaches normal operating temp, the idle drops back down to its normal range (usually around 700–800 RPM).
Now, if it’s too low (like stalling or shaking) then you might be dealing with carbon buildup on the throttle body or IAC (idle air control) valve, or even a weak sensor reading (like the coolant temp sensor feeding bad info to the ECU). But if it just drops after warming up and holds steady, then that’s just how it’s supposed to work.
But in the worst-case scenarios, the low idle usually has something to do with how it handles idle speed once it’s warmed up. A few common things to check:
- Idle Air Control Valve (IACV) – That little guy regulates idle speed. When it gets dirty or sticky, it can act up when the engine's hot and trying to idle lower. Cleaning it out often helps.
- Vacuum leak – Sometimes when parts heat up, rubber hoses expand or soften just enough to leak. Could be a cracked vacuum line, gasket, or intake boot.
- Coolant temperature sensor – This tells the ECU how hot the engine is. If it’s sending bad signals, the ECU might think the engine’s still cold or way too hot and mess with idle.
- Throttle body gunk – A dirty throttle plate can cause poor idle, especially once the idle drops on a warm engine.
Start with the IAC and throttle body — a good clean-up might already fix it. If not, check for vacuum leaks and maybe scan it for any hidden codes.
We also recommend grabbing the service manual, as the troubleshooting chart can save you a ton of headaches here. Feel free to contact us again with more details on your APV (e.g. model year, engine, etc.) so we can assist you further.
