What is the normal idle speed for a Bora when starting cold?

[VonJeffrey]

Bora cold start idle speed 800 to 1750 is normal, as long as the fault light is not on. Starting idle means when the car starts without giving gas, slowly lifting the clutch to achieve the purpose of starting. After the vehicle moves, completely lift the clutch and then accelerate to drive, you can add a little gas. The Bora has a length, width, and height of 4663mm, 1815mm, and 1462mm respectively, with a wheelbase of 2688mm. It is equipped with a 1.5L naturally aspirated engine, with a maximum horsepower of 113ps, maximum power of 83kw, maximum torque of 145nm. The front suspension uses MacPherson independent suspension, and the rear suspension uses torsion beam non-independent suspension.

[MaliaRose]

My car has been in use for many years, and it's true that the RPM is noticeably higher during cold starts. Especially after sitting overnight in winter, the tachometer needle often jumps to just over 1000 RPM, and the engine noise is louder than when warmed up. This is the ECU intentionally raising the RPM to quickly heat up the catalytic converter and ensure smooth oil circulation, normally maintaining between 800 to 1200 RPM. Once the temperature gauge needle starts to rise, it usually takes tens of seconds or a minute for the RPM to gradually drop back below 800. If the RPM stays above 1200 and doesn't come down, or if the car shakes violently, it might be time to check if the throttle body is dirty or if the air filter needs replacement.

[Cathy]

Just the other day, I was chatting with Old Wang from the neighborhood repair shop about this. He's worked on quite a few Bora models. He said there's no need to overthink the RPM during cold starts—it's similar for both new and old cars, and the key is to observe the stability. Typically, fluctuations around 900 RPM are normal, and even spikes up to 1100 RPM in winter fall within reasonable limits. The electronic system automatically adjusts the fuel injection ratio, so focus on the changes after about 30 seconds. If the RPM fluctuates erratically or stays stuck at 1500 RPM even after the engine warms up, it might indicate issues like carbon buildup on the oxygen sensor or unstable battery voltage, especially for older cars over six years—pay attention to corroded wiring harness connectors too.

[Sharon]

The engine management system across the entire Bora lineup is similar, with cold start initial RPM typically fluctuating around 1000 rpm. The ECU determines idle strategy based on coolant temperature signals - it may rise to 1100-1200 rpm at 0°C environment, while stabilizing around 950 rpm at 20°C. The most critical indicator is the steadily decreasing RPM trend, which should normally drop to the warm-up standard value of 750-800 rpm within 90 seconds. Abnormal situations requiring attention include: RPM remaining above 1000 rpm for over 3 minutes accompanied by warning light illumination; or severe fluctuations exceeding ±50 rpm - these cases require workshop diagnosis of throttle valve assembly or ignition coils.