What does a cold start injector time switch do?
What does a cold start injector time switch do?
Cold Start Time Switch: This Time Switch tells the Cold Start Injector when to fire. It is located under the throttle body on the lower intake manifold, right next to the ECU coolant temperature sensor (not the gauge temperature sensor).
How does a cold start switch work?
When an engine first starts, the coolant temperature is cold and the bimetallic strip is closed, which in turn supplies the cold start injector with current.
Where is the cold start sensor?
In most makes, the cold start valve will be located within the air intake distributor. Remove the air intake cover and the air filter. You should notice a small valve that looks like a fuel injector within the assembly.
What is the purpose of a cold start sensor?
It’s purpose is to supply the engine with additional fuel to enrich the fuel mixture in cold temperatures where air density is increased and additional fuel is required.
Is cold start bad for engine?
It’s a common occurrence as low temperatures can cause your car battery to produce less current, making it that much harder for your engine to turn over in the morning. The cold can also stop your engine oil from flowing as well as it should, which puts even more strain on the battery.
What are the symptoms of a bad cold start valve?
5 Signs of a Faulty Cold Start Valve
- Sign #1: Difficult Start – Delay and Hesitation.
- Sign #2: Engine Does Not Start at All.
- Sign #3: Engine Floods When Trying to Start.
- Sign #4: Engine Starts and Then Stops.
- Sign #5: Engine Smokes When Started, Then Stops.
How does a thermo time switch work?
The Thermotime switch is a temperature switch that turns on the Cold Start valve during startup when the engine temperature is cold enough. This system is only powered during start, so it should not give you a rich condition unless the cold start valve is faulty and leaking.
What is a cold start switch in a car?
The cold start valve is also known as a ‘cold start injector’. It sits in your car’s intake manifold and links with the cold air intake. Your engine needs to be at the temperature to deliver power around the car. While older cars use a choke to deliver extra fuel, the cold start valve is its equivalent in modern cars.
Why do cold starts sound better?
When it is cold, more fuel is added to the air/fuel mixture to make up for the lack of natural vaporisation. So the AFR (air-fuel ratio) is seen by the ECU to be leaner than usual (below the Stoichiometric ratio of 14.7:1) so it compensates for this with extra fuel to make up for the unburned fuel due to the cold.
Why you shouldn’t rev a cold engine?
Revving the engine won’t speed up the process. Cold revving causes abrupt temperature changes that create stress between the engine’s tight-fitting components. Simply give it 60 seconds before you get on the road, and everything will have warmed up for reliable performance.
How do you test a cold start valve?
Put the cold start valve in a cup or jar. 3 – Pull the RPM relay. Jumper the brown wire on that socket to the Yellow-red wire AND the white-purple wire (the fan fail jumper is good for this if you have one). This will turn on the fuel pump AND hotwire the cold start valve at the same time.
How do you test a thermo time switch?
The thermo/time switch grounds the injector relay for aprox 8 seconds when cold and less time as the temp increases. The “simple” test is to connect the switch housing to ground, attach a test light to the terminal with the larger screw and to the + terminal of the battery.
