What causes misfire on first 1000 revolutions?

Asked by Candace Aug 16, 2020 at 12:48 AM about the 2005 Ford F-150 STX

Question type: Maintenance & Repair

Put $30 in gas and started skipping. Ran
diagnostic machine, said fuel bank to lean. We
knew the fuel pump was due to be changed so we
did. Ran fine for ½ day then started skipping. Ran
the diagnostic machine again it said misfire on 3
and misfire in first 1000 revolutions. Changed the
coil and the plug and still the same, diagnostics
are the same. Any idea what it could be?

3 Answers

F_O_R answered 3 years ago

Bad coils or old spark plugs. Check for vacuum leaks.

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Laoaznkev87 answered 3 years ago

The O2 Oxygen sensor fails, and can cause misfiring. So many reasons for Cylinders misfiring

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James answered 3 years ago

Bad fuel injector or poor compression on cylinder number 3. Hope that helps! Jim

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