Cold Start Valve
The cold start valve – it is otherwise known as the fifth injector. It is also known as the heat riser channel. It is essentially a variety of control valve that can be found snuggled in the crook between the exhaust manifold and the exhaust pipe. However this applies to any typically unaltered V8 or V6 engine. The placement of the cold start valve is such that it is set atop the intake air distribution box, while arranged in a parallel proximity to the fuel rail. An electrical connection furnishes the cold start valve, while a fuel inlet line pumps in the necessary lifeblood- taking it out again through the fuel outlet line.
The manner of construction of the cold start valve is essentially quite similar-if not absolutely – as that of any other regular fuel injector. The main positive difference is the fact that the injection time of the cold start valve is gauged at intervals of a second. This is completely unlike a regular injector which has an injection time fine-tuned to intervals of milliseconds. The main source of power entering the cold start valve is from the double relay triggered by the insertion of the key, and the gearing of it to the starting position. This happens because the insertion of the key allows fuel to flow into the intake air distributor because the dual procedure also triggers the process of grounding the cold star valve with the thermo-time switch.
The cold start valve exists to serve the purpose of pumping in fuel into the intake air stream, whenever such a situation arises that the engine has turned cold, all ready for the starter to begin its operation. This is done so as the mixture of fuel and air can be further enriched for a smoother start off. The process is undergone by the aid that the cold start valve gives to the evaporation of the fuel, and this enhances the rate at which an engine will warm up. If the cold start valve is left open, this will not only slow down the warm up of the engine, but it will also be the cause of faltering and periodic stopping during times when the engine is cold. Then again, if the heat riser valve is left closed, it will completely constrict the exhaust system by initiating a power loss and degeneration of the optimum situation of the fuel. After fulfilling its purpose the cold start valve comes to a standstill.
The symptoms of failure of the cold start valve are many, but quite easily distinguishable. This enables the user to undergo various tests on it to ensure its state of health, before seeking professional assistance. One of the symptom is if the cold start valve cannot operate without the press of the foot on the pedal. Another would be if the cold start valve cannot continue running once set to the cold idle state.
Failure to start up the cold start valve will result in the user having to crank harder and longer to begin the cold starts. However if the start is done warm, then the occurrence of situations of related nature will put your mind at ease by shifting the blame on the fuel supply.
However to assert the conditions of a cold start valve failure, testing is essential. Cold start valve, Heat riser valve, fifth injector, whatever name you may refer to it with, the testing of it is completely similar to that of other injectors. The appliances required are only two bits of wire which are attached to a battery. One of the wires is held to the terminal of the cold start valve, while the other terminal is lightly tapped at intervals with the other wire. A resonating result of solenoid clicks will assure the good state of the cold start valve. This test is best done each time the user observes the ejection of fuel every time the fuel rail is connected. This is because leakages are to be avoided at all costs.
One could also partake a reading of the line voltage off the wiring harness to the cold start injector during the cranking session, beforehand. However this must be done under circumstances where the car had been allowed to sufficiently cool down in cold environments. The receiving of a diagnostic code of 3-2-1 continually will negate the assurance of good health of the cold start valve.
The cold start valve aids the car by the addition of extra fuel into the starting of the car, and lowers the temperature of the run mixture, thereby resulting in enhanced, streamlined performance. Thus it is absolutely expected that the user will want to invest in some cleaning now and then. The cleaning processes of the valve can be made simpler by the usage of carby cleaners. The consistency of carby cleaner is methanol and acetone in a ratio of 1:1, so it might be harmful to the paint coats.