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Spark knocks

Tiny
BIGGUY123
  • MEMBER
  • 2003 FORD F-150
  • 4.2L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 156,000 MILES
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.
Sunday, December 20th, 2015 AT 5:35 AM

2 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 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.
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Sunday, December 20th, 2015 AT 5:38 AM
Tiny
BIGGUY123
  • MEMBER
  • 2 POSTS
Thanks
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Monday, December 21st, 2015 AT 3:42 AM

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