What happens to the PCM when the engine is cold?
While the engine is cold the (PCM) will remain in “open loop” and keep the fuel mixture rich; to improve idle quality and cold driveability. If the (PCM) fails to go into “closed loop” once the engine is warm; the fuel mixture will be too rich causing the engine to, pollute and waste gas.
What causes cold stalling on a fuel injected engine?
On fuel injected engines, cold stalling can also be caused by conditions that upset the air/fuel mixture. This includes vacuum leaks or unmetered air entering the intake manifold downstream of the airflow sensor, a faulty throttle position, MAP or oxygen sensor, dirty fuel injectors,…
How to check the coolant temperature of an engine?
The (OBD II) system should catch the fault and turn on the, check engine light or (MIL) lamp. You may see one of the following diagnostic trouble codes: P0115….Engine Coolant Temperature Circuit P0116….Engine Coolant Temperature Circuit Range/Performance P0117….Engine Coolant Temperature Circuit Low Input
What causes an engine temperature gauge to stay on cold?
Reasons Why your Engine Temperature Gauge Stays on Cold 1. Faulty Engine Coolant Temperature Sensor 2. Faulty Gauge/Cluster 3. Broken wires to the sensor or to the gauge 4. Bad Thermostat 5. Corrosion in connectors 6. Air in the coolant system 7. Broken engine control unit
What is the temperature of the coolant in an engine?
If your car model has two coolant temperature sensors, one is used by the temperature gauge, and one is used for the engine control unit. Engine temperature sensors are easy to measure with a multimeter, but you need to find the right values of them.
What does the cold start injector do in a car?
The cold start injector in your engine adds more fuel until the engine reaches the proper operating temperature to compensate for the cold weather. Basically what’s happening is that your vehicle’s ECU is directing the injector to squirt in a tiny bit more gasoline to make a richer fuel mixture towards the end of warming your car up faster.