Low compression in #1 cylinder

Asked by Aug 22, 2016 at 03:16 PM about the 1993 Ford F-250 2 Dr XL Standard Cab LB

Question type: Maintenance & Repair

1 Answer

59,115

How low? Try squirting about a teaspoon full of motor oil in the cylinder through the spark plug hole. If the reading improves it's the piston rings. If it doesn't improve the reading or the reading is very low it's a stuck/burned valve. HTH. -Jim

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