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My 1991 740 volvo turbo doesnt start specially during the morning.Is it comes with a cold start valve?
this could be due to a faulty cold start injector, or cold start injector time switch. Could also be caused by incorrect valve adjustment.
were is locate the cold start valve
One is the Head Temp sensor, other is either a knock sensor, or on the throttle body it's the cold start injector
It can be battery, faulty coolant temperature sensor, faulty cold start injector, malfunctioning fuel system, injector leaking.
No.
maybe weak battery or an injector component is defective ( the additional injector that gives extra fuel to start the car )
A thermo time switch is a temperature sensor device normally used to turn on a cold start injector in German cars. The cold start injector is an extra injector normally mounted in the intake manifold. The thermo time switch will allow current through it to your cold start injector for a few seconds ( 3 - 8 depending on the make and model of car ) when the engine is cold and first started. This puts extra fuel in the system and helps it start. If your thermo time switch fails you may have a hard time starting when cold or, more commonly, a difficult time starting the car when hot. The problem in the latter case is the extra injector flooding the car when trying to start it.
This engine will have seven injectors. 6 are the running injectors and there is a "Cold Start" injector.
There is a high pressure fuel line under the throttle body that carries fuel to the cold start injector. There is a black pipe that feeds idle air to the same spot to insure the cold start injector gets a good mixture.
Have the cold start injector checked
location of the cold start switch on 1991 corolla auto