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1991 Lexus LS 400 oil pressure and loss off power

Tiny
HOFF19580
  • MEMBER
  • 1991 LEXUS LS 400
Engine Mechanical problem
1991 Lexus LS 400 V8 Two Wheel Drive Automatic 200k miles

oil pressure light going off and on, slight rattling on excelleration wiyh a lose of power
Wednesday, May 5th, 2010 AT 10:09 PM

3 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there,

The first thing that you need to do is get the oil pressure tested with a mechanical gauge, lets see what the actual pressure is first, start here.

Mark (mhpautos)
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Wednesday, May 5th, 2010 AT 10:30 PM
Tiny
HOFF19580
  • MEMBER
  • 2 POSTS
Thanks. The oil pressure is about 75psi. What's next?If you can help me fix this I will certanly make it worth your wild.I realize time is money. Thanks again!
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Thursday, May 6th, 2010 AT 7:05 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
OK, oil pressure sounds fine, so I would be replacing the pressure switch, no I would get a scan done and look for a faulty knock sensor, as I feel it is a timing issue causing this rattle, if it is there under acceleration, I would be fairly sure that we may be looking at a knock sensor,

mark
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Friday, May 7th, 2010 AT 1:30 AM

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