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1998 Lexus GS 400 poor compression in a low mileage vehicle

Tiny
PNESS1
  • MEMBER
  • 1998 LEXUS GS 400
  • V8
  • 2WD
  • AUTOMATIC
  • 125,440 MILES
Car has 65-85 psi of compression. This is accompanied by excess oil on spark plugs and in tube that links air cleaner to throttle body. Could this be due to a valve adjustment? Or is the motor worn out? The car doesn't have smoky exhaust. Possibly timig belt/chain malf?
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Sunday, November 1st, 2009 AT 6:05 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
If both dry and wet test reads this compression pressures-sounds more like valves-do a cylinder leakage test this will tell where its leaking at-
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Sunday, November 1st, 2009 AT 6:36 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hi pness1 and TY for the donation

If both dry and wet test reads this compression pressures-sounds more like valves-do a cylinder leakage test this will tell where its leaking at-
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Sunday, November 1st, 2009 AT 6:38 PM

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