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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

piston clanking

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Old Nov 11, 2011 | 10:58 PM
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ItsAFord55
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piston clanking

my 1991 f150 302 makes a loud clanking noise in the engine whenever you acclerate or go up a hill. it sounds like the pistons are clanking.
 
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Old Nov 11, 2011 | 11:07 PM
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Come on all a sudden? Any recent work done to it? sure its not really bad spark knock?

Check the base timing, better fuel (higher octane) and/or set the timing back few deg, see if noise you hear diminishes some if not completely?
 
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Old Nov 12, 2011 | 12:43 PM
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Im thinking it might be the grade of fuel...but when ever it happens it smells of unburned fuel
 
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