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  HomeArticles/VideosTechnical BulletinsFiat/LanciaFuel & Emissions System >

Bosch L-Jetronic: Testing thermo time switch/cold start valve


Remove the cold start injector from the intake manifold, place the nozzle in a safe container and crank the engine. If the temperature of the engine is below 95 degrees, the cold-start injector should spray. If it does not, connect a test light to each of the two terminals of the injector and crank the engine. If one terminal activates the light but the other does not, replace the cold-start injector. If both terminals activate the light, inspect the wiring between the cold-start injector and the thermo-time switch. If the wiring is OK, replace the switch. If neither terminal lights up the light, repair the wiring harness between the starter solenoid and the cold-start injector.

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All Technical Bulletins and Tech Tips contained on this website are based on our own experience, and are not necessarily "factory approved." While we make a reasonable effort to verify the information contained in them, we assume no liability for the use or misuse of the information offered.

*Overseas customers please note that our entire website is based on US-spec cars, as sold before the manufacturer left the US market: up to 1985 (Fiat/Lancia) and 1995 (Alfa Romeo). We do not carry parts for current models.