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1998 Ford Ranger has a loud knock when I first start it

Tiny
2CP-ARCHIVES
  • MEMBER
  • 1998 FORD RANGER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 78,000 MILES
1998 Ford Ranger mileage: 78,000. The engine has a loud knock when I first start it like the lifters are not getting any oil to them, the dipstick says I'm full on oil yet the pressure gauge never registers above zero even at highway speed, yet the truck seems to run okay after it warms up, not great, just okay. It seems to rattle when I accelerate. I haven't seen any sign of an oil leak, just a small leak from the transmission. I usually use a 10/40grade of oil. Any help would be appreciated.

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Wednesday, February 2nd, 2011 AT 8:36 PM

1 Reply

Tiny
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  • MEMBER
  • 4,540 POSTS
You may have low oil pressure. With engine the stopped, remove the oil pressure-sending unit. Replace with a temporary mechanical oil pressure gauge. Start the engine and note pressure at idle and at 2000 RPM. At 2000 RPM, the pressure should be approximately 40 to 50 pounds at idle. If you do not get these results, you may have internal engine problems. One possibility is a stuck oil pressure relief valve. Another possibility is an engine bearing (rod or crank) has failed. That may be the source of your knock.
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Wednesday, February 2nd, 2011 AT 8:38 PM

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