Timeline for Why does a car push start?
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8 events
| when toggle format | what | by | license | comment | |
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| Feb 5, 2022 at 19:39 | comment | added | F Dryer | Apology accepted. Let's move on. Since generators are no longer used and every engine with EFI uses alternators, push starting a vehicle relies on the battery. Your approximation of 8-9 volts may be the absolute minimum to keep the EFI system running. | |
| Feb 5, 2022 at 19:19 | comment | added | Pᴀᴜʟsᴛᴇʀ2♦ | @FDryer - My apologies if you misunderstood my point. My comment was in direct relation to your previous statements of how you believed generators work, which was off base ( "generator provides nothing during push starting" ). My post was not whether EFI used generators or not, it was about alternators not providing anything if the battery is below a certain point, because there is not enough there to energize them. If the battery is too low, the ECU won't work, either. I don't believe blacksmith37's opinion is factual, either. I've had different experiences. | |
| Feb 5, 2022 at 18:31 | comment | added | F Dryer | First, generators are outdated and not used in EFI systems. Feel free to correct me. Second, alternators are used in every EFI system. Debating the generators operation relative to EFI operation is pointless. Perhaps reading blacksmith37's may help you. | |
| Jan 31, 2022 at 11:34 | comment | added | Pᴀᴜʟsᴛᴇʀ2♦ | @FDryer - You really need check out how generators work. They have permanent magnets which don't require a power source to get them working. And batteries can easily be down below the point where the EFI system will not function correctly. If it is below this point (as stated, probably below 8-9vdc), the car isn't going to start. Before you downvote me out of spite, you should really check your facts. | |
| Jan 31, 2022 at 4:12 | comment | added | F Dryer | A generator provides nothing during push starting The same for alternators until the engine runs. This means the battery is powering the EFI system. If everything is turned off (heater blower, radio, ac, internal/external lights, etc) with ignition on, virtually all car batteries have enough remaining capacity to supply the ignition system if not the entire EFI system for a push start. | |
| Jan 29, 2022 at 22:22 | comment | added | blacksmith37 | The only problem I remember was ice and snow; the wheels could slip and not turn on ice. | |
| Jan 29, 2022 at 22:16 | comment | added | blacksmith37 | I push started a few OLD cars; standard transmissions and generators ; generators were worthless at cranking or pushing RPM. So , because the generators were no help , there was always enough in a "dead" battery for the low power needed for ignition ( only needed for a matter of seconds) . Fuel pumps were mechanical. | |
| Jan 29, 2022 at 17:16 | history | answered | Pᴀᴜʟsᴛᴇʀ2♦ | CC BY-SA 4.0 |