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Carnician

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  • First Name
    Cu

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  • Lexus Model
    RX300
  • Lexus Year
    1999
  • Location
    Ontario

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  1. Back from the dead thread. Whatever happened with the engine? I think this is a mechanical problem and not electrical. New engine or a rebuild is required to fix the problem. Coolant is not compressible and the engine hydro-lock when much coolant entered the combustion chamber. The result could be bent valves or connecting rod. That is the reason ECU throwing misfire DTCS, if check engine compression on #1, 3 and 5 cylinders there would not be much PSI at all.
  2. I just fixed my 99 RX300 for the same problems and symptoms for bank 1 (close to the firewall). The codes were p1349 Variable Valve Timing (VVT) System Malfunction code and misfire codes p0300, p0301, p0303 an p0305. Rough idles, hard brake pedal at time, lurching and also engine/transmission humming at steady 80kph experienced. Found alot of info on OCV replacement from Google but no specific causes to valve failure. I check the ocv filter ok, check OCV resistance ok (compare B1 to B2). Check OCV B1 mechanically by shaking the valve and compare to b2 and notice the shuttle valve moves more easily (louder noise when shaking indication of the OCV fails mechanically). Replace B1 OCV, clear DTC and been driving for more than 100 kms and CEL has not come back yet. Before replacement CEL turned on after drvining for approx 15 kms on first drive cycle. Good luck.
  3. Welcome to the Lexus forums Carnician :)

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