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Methods and systems for starting a vehicle engine are provided. One example method for starting a vehicle engine having a plurality of cylinders may include generating hydrogen gas and oxygen gas onboard the vehicle from water. The method may further include maintaining the hydrogen gas and oxygen g

Methods and systems for starting a vehicle engine are provided. One example method for starting a vehicle engine having a plurality of cylinders may include generating hydrogen gas and oxygen gas onboard the vehicle from water. The method may further include maintaining the hydrogen gas and oxygen gas together as a gaseous mixture. The method may further include injecting the gaseous mixture to at least one cylinder of the engine during a start.

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1. A method for starting a vehicle engine, comprising: generating hydrogen gas and oxygen gas onboard the vehicle from water;maintaining the hydrogen gas and oxygen gas together as a stoichiometric mixture combination of diatomic hydrogen gas and diatomic oxygen gas; andduring engine starting: injec

1. A method for starting a vehicle engine, comprising: generating hydrogen gas and oxygen gas onboard the vehicle from water;maintaining the hydrogen gas and oxygen gas together as a stoichiometric mixture combination of diatomic hydrogen gas and diatomic oxygen gas; andduring engine starting: injecting an amount of the stoichiometric mixture to an engine cylinder, injecting a liquid fuel, retarding spark timing as the amount increases, and advancing spark timing as the amount reduces. 2. The method of claim 1, wherein the hydrogen gas and the oxygen gas are generated under pressure in an electrolyzer, and the stoichiometric mixture is maintained under pressure. 3. The method of claim 1, wherein the injecting of the stoichiometric mixture includes injecting the stoichiometric mixture to the engine cylinder of the vehicle engine positioned with a piston, and intake and exhaust valves on a power stroke before engine rotation of the start. 4. The method of claim 1, wherein the injecting of the stoichiometric mixture includes injecting the stoichiometric mixture for a first combustion event during the engine starting, where combustion of the stoichiometric mixture generates an initial rotation of the engine from rest. 5. The method of claim 1, further comprising storing the stoichiometric mixture in a gas storage unit. 6. The method of claim 5, further comprising generating the stoichiometric mixture in response to an amount of the stoichiometric mixture in the gas storage unit being below a first threshold. 7. The method of claim 1, wherein the injecting the liquid fuel includes reducing a fuel pulse width of a liquid fuel when the amount of the stoichiometric mixture injected is increased, and increasing the fuel pulse width of the liquid fuel when the amount of the stoichiometric mixture injected is reduced. 8. The method of claim 1, wherein the injecting the liquid fuel includes retarding fuel injection timing of the liquid fuel as the amount of the stoichiometric mixture injected is increased and advancing the fuel injection timing of the liquid fuel as the amount of the stoichiometric mixture injected is reduced. 9. The method of claim 1, wherein the generating includes supplying the water from a windshield washer solvent stored in a windshield washer solvent storage unit. 10. A method for starting a vehicle engine having a plurality of cylinders, comprising: generating diatomic hydrogen gas and diatomic oxygen gas by electrolysis of water by an onboard electrolyzer;maintaining a stoichiometric combination of the diatomic hydrogen gas and the diatomic oxygen gas together as a gaseous mixture in a pipe system connected to the electrolyzer;under some engine operating conditions, delivering the gaseous mixture from the electrolyzer to a gas storage unit via the pipe system;injecting the gaseous mixture to at least one cylinder of the vehicle engine during an engine start; andinjecting a liquid fuel during the engine start, wherein the injecting includes retarding a spark timing as the amount of the gaseous mixture injected is increased, and advancing the spark timing as the amount of the gaseous mixture injected is reduced. 11. The method of claim 10, further comprising storing the gaseous mixture in the gas storage unit, wherein the gas storage unit is a pressurized container enhanced with adsorptive storage. 12. The method of claim 11, wherein the generating includes generating the diatomic hydrogen gas and the diatomic oxygen gas when an amount of the gaseous mixture in the gas storage unit is below a predetermined low threshold. 13. The method of claim 10, wherein the injecting includes injecting the gaseous mixture to at least one cylinder of the vehicle engine positioned with a piston, and intake and exhaust valves on a power stroke before engine rotation of a direct start. 14. The method of claim 10, wherein the generating includes generating the diatomic hydrogen gas and the diatomic oxygen gas under pressure in the electrolyzer, and maintaining the diatomic hydrogen gas and the diatomic oxygen gas under pressure in the pipe system and the gas storage unit. 15. The method of claim 10, further comprising injecting the liquid fuel, wherein the injecting includes reducing a fuel pulse width of the liquid fuel when an amount of the injected gaseous mixture is increased during the engine start, and increasing the fuel pulse width of the liquid fuel when the amount of the gaseous mixture injected is reduced during the engine start. 16. The method of claim 10, further comprising injecting the liquid fuel during the engine start, wherein the injecting includes retarding a fuel injection timing of the liquid fuel as the amount of the infected gaseous mixture is increased, and advancing the fuel injection timing of the liquid fuel as the amount of the infected gaseous mixture is reduced. 17. A method for direct starting a vehicle engine having a plurality of cylinders, comprising: generating diatomic hydrogen gas and diatomic oxygen gas by electrolysis of water by an onboard electrolyzer;maintaining a stoichiometric combination of the diatomic hydrogen gas and the diatomic oxygen gas together as a gaseous mixture in a pipe system connected to the electrolyzer;delivering the gaseous mixture from the electrolyzer to a gas storage unit via the pipe system when an amount of the gaseous mixture stored in the gas storage unit is below a predetermined low threshold;delivering the gaseous mixture from the electrolyzer to the engine via the pipe system when the amount of the gaseous mixture in the gas storage unit is above a predetermined high threshold and direct start conditions are met;adjusting one or more of a fuel pulse width of a liquid fuel type, a fuel injection timing of one or more of the liquid fuel type and the gaseous mixture, and a spark timing based on an amount of injected gaseous mixture, wherein the fuel pulse width is reduced, fuel injection timing is retarded, and spark timing is retarded as the amount of the injected gaseous mixture is increased; andinjecting the gaseous mixture to at least one cylinder of the engine positioned on a power stroke before a first combustion event from engine off during a direct start.