consciousness no more than a single spark


Senior Member
Somehow she was able to pull over and shut off the engine before her breakfast bolted up and out a moment after she managed to claw the driver’s door open. For a moment she just hung there with her forearms propped on the open window of the half-open door, bent awkwardly outward, consciousness no more than a single spark which she maintained by her determination that it should not go out. At last she was able to straighten up and pull the door closed.

Source: The Tommyknockers by Stephen King

Does the bolded expression mean that she was barely conscious? Is the spark used metaphorically for the literal spark that keeps engine running?

Thank you
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