1998 Ford F150 Engine knock

1998 FORD F-150
113,000 MILES • V8 • 4WD • AUTOMATIC
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MCOX0112
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  • 2 POSTS
Now that the weather is getting cold I noticed that when I start my truck I'm getting a knocking sound from the engine. It sounds to loud to be a valve tap.
Nov 3, 2008 at 10:33 PM
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MASTERTECHTIM
  • ✓Experienced Mechanic
  • 4,750 POSTS
try a lower viscosity oil, like 5/30, this should help with cold start ups. also i found that a exhasut manifold leak is misinterpretated for a engine knock and goes away when warm because the manifold expands when warm so doulble check for a exhaust leak
Nov 3, 2008 at 10:45 PM
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MASTERTECHTIM
  • ✓Experienced Mechanic
  • 4,750 POSTS
5/20 weight oil. if you go to a quickie oil change place they might be installing 10/40 or 10/30
Nov 3, 2008 at 10:47 PM
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MCOX0112
  • MEMBER
  • 2 POSTS
I change my own oil and I already use 5W30 but I will check for an exhaust manifold leak. Thanks
Nov 3, 2008 at 11:02 PM
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