spark knocks

2003 FORD F-150
156,000 MILES • 4.2L • 6 CYL • 2WD • AUTOMATIC
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BIGGUY123
  • MEMBER
  • 2 POSTS
engine spark knock a lot mostly when you mash the gas peddle, I've changed to non ethanol gas, used a can of seafoam, no help at all, changed spark plug wires, coil one year ago..
Dec 19, 2015 at 9:35 PM
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WRENCHTECH
  • ✓Experienced Mechanic
  • 20,761 POSTS
Verify that the EGR is working and opening fully and the passage isn't clogged. You could also have excessive carbon buildup on the pistons which increases the compression ratio.
Dec 19, 2015 at 9:38 PM
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BIGGUY123
  • MEMBER
  • 2 POSTS
thanks
Dec 20, 2015 at 7:42 PM
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