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Random fast crank, then start

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Old 07-14-2017, 01:42 PM
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Default Random fast crank, then start
I have an 03 with the 4.6. It has 150k miles on it. Sometimes it randomly turns over very fast for about 3 seconds before starting up. Everything runs fine after it starts. This happens maybe 10% of the time that I start it and it doesn't seem to have any pattern.

Any ideas on what it could be? I've head maybe a bad injector o-ring?
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Old 07-14-2017, 03:08 PM
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Spark plugs. Could be a slow fuel pump.
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Old 07-14-2017, 03:59 PM
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Spark plugs are new. Hopefully not the fuel pump but could be.
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Old 07-21-2017, 01:49 PM
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Bumping this up.
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Old 07-21-2017, 03:37 PM
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So what did you find out about the fuel pump and regulator ?
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Old 07-21-2017, 03:53 PM
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What do you mean by a slow fuel pump? It's very sporadic so I'm sure how to go about testing that.
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Old 07-21-2017, 04:33 PM
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Good Luck.
Last edited by Jbrew; 07-22-2017 at 10:28 PM.
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Old 07-17-2019, 06:50 AM
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It’s not push button or remote start. It’s turn key but it’s doing same as you described
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Old 07-17-2019, 08:08 AM
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Originally Posted by RedTucker
It’s not push button or remote start. It’s turn key but it’s doing same as you described
Huh?
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Old 07-17-2019, 08:15 AM
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Originally Posted by RedTucker
It’s not push button or remote start. It’s turn key but it’s doing same as you described
These random long cranks are often variation in the fuel pressure. I would start with that.
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