engine knock @2000rpm
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Freshman User
Joined: Dec 2003
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engine knock @2000rpm
well im not sure what this one is if i hold down the gas peddle @2000 rpm's while in park i get clunking noise from engine also if i let off the gas peddle and immedietly press down again some times it will clunk when its cooling down she clunks dealer put new cats on but no difference oh yey its a 2003 f-150 sc 4.2 liter i have made post on this same issue but no response so i figured i would word it a little different just maybe someone has had this problem.
Cargo Master
Joined: Aug 2002
Posts: 2,013
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From: Cajun Country
The clunking noise you are hearing when your truck is cooling down are the catalytic converters.They get so hot when running that when you shut off the engine the rapid cool down makes the steel "creak". Mine does it all the time. 
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