Backfire

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Good morning... this has now happened twice so I thought Id ask. I turn on the key and without touching the starter I will immediately get a single fire from one of the cylinders. It doesn't backfire though the intake its just a quick single poof through the exhaust. Anything to worry about?

 

[Bill Seward]

Mine also does that once in a while.

 

[Fire-medic]

"Clearing its throat."

I suppose it's from a bit of a residual rich mixture left in the exhaust pipes, though I don't know why the primary circuit would be generating a spark before the starter is thumbed.

 

[Damon]

I have also had this happen on the early model Vmax's 1985's ~ 1989's and just attributed it to the early model ECU's