spark knocks

2003 FORD F-150

156,000 MILES • 4.2L • 6 CYL • 2WD • AUTOMATIC

BIGGUY123

MEMBER
2 POSTS
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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

AUTOMOTIVE REPAIR CONTRIBUTOR
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 20, 2015 at 5:38 AM

BIGGUY123

MEMBER
2 POSTS

thanks

Dec 21, 2015 at 3:42 AM