Knocking and loss of power

2001 MAZDA B3000
1,945,801 MILES • 2WD • AUTOMATIC
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CYNTHIA6169
  • MEMBER
  • 3 POSTS
When I start my truck it sounds good but when it gets warm it starts knocking and I lose power. What could it be?
Thank you for your time.
Cyn6169
Sep 25, 2019 at 9:44 AM
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STEVE W.
  • ✓ASE Certified Mechanic
  • 15,200 POSTS
  • ASE Certified Mechanic
Welcome back. Knocking and power loss are not good signs. Usually this shows that the engine is very worn and the oil pressure isn't high enough to keep the bearings lubricated because of the wear. The "proper" repair would be to rebuild the engine or replace it with one with less mileage. What you could do is try using a thicker engine oil in it. Or add some oil viscosity modifier like STP to see if the problem lessens. If it does then wear is the problem and a rebuild or replacement would be a better long term option, if the rest of the truck is in good shape.
Sep 25, 2019 at 4:17 PM
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