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motor pinging???

  #1  
Old 07-24-2011, 08:41 PM
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Default motor pinging???

2003 f150 5.4 /7700 series. motor has 167k and pinging is getting louder. usually under load. it is worse when on highway and i let off gas then resume. i have always ran 87 octane but have tried running 93 and also octane booster. neither hepled. i also ran some seafoam thru the powerbrake vaccuum line. still the same pinging. a friend said possible timing is off? any advice is appeciated.
 
  #2  
Old 07-24-2011, 09:08 PM
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Try removing your catalytic convertor. It's quite possible, some time in the past your truck may have developed a condition and caused your convertor to possibly plug up a bit.
You could also try a thicker oil viscosity and use a 100% Synthetic
 
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