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1998 Ford F-150 Engine knock

Tiny
MCOX0112
  • MEMBER
  • 1998 FORD F-150
  • V8
  • 4WD
  • AUTOMATIC
  • 113,000 MILES
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.
Tuesday, November 4th, 2008 AT 6:33 AM

3 Replies

Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 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
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Tuesday, November 4th, 2008 AT 6:45 AM
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
5/20 weight oil. If you go to a quickie oil change place they might be installing 10/40 or 10/30
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Tuesday, November 4th, 2008 AT 6:47 AM
Tiny
MCOX0112
  • MEMBER
  • 2 POSTS
I change my own oil and I already use 5W30 but I will check for an exhaust manifold leak. Thanks
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Tuesday, November 4th, 2008 AT 7:02 AM

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