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 20, 2015 at 5:35 AM
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WRENCHTECH
  • ✓ASE Certified Mechanic
  • 20,761 POSTS
  • ASE Certified Mechanic
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 20, 2015 at 5:38 AM
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BIGGUY123
  • MEMBER
  • 2 POSTS
thanks
Dec 21, 2015 at 3:42 AM
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