Question about Lexus RX 300
When in park it revs up and down erratically until it eventually dies. when driving down the road it will go 40mph without touching the accelerator
Vacuum leaks .. high idle solenoid messed up..works with the defrost setting..
Posted on Dec 29, 2013
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Posted on Jan 02, 2017
hey-I have has this before different car but same - idle control valve is failing - computer at shop will pick this up on diagnostic
Posted on Oct 12, 2008
The coolant leak could be a blown head gasket. And the not going over 30 MPH could be from the catalytic converter being clogged. Do a compression test for the head gasket, and remove the O2 sensor from the exhaust and drive with the exhaust leaking out the hole. If the lower back pressure allows the car to go over 30 MPH then you know the cat. is clogged.
Posted on Feb 05, 2009
SOURCE: rough eratic idling
Check the idle air bypass valve see if dirty, cleanable unit. you check the working of valve by powering the unit with 12 volts. check map sensor too.
Posted on Nov 20, 2009
Sounds like your TPS (throttle position sensor), or MAF (Mass Air Flow) sensor has gone caflooey.
Check your car's OBD-II computer code(s), by going to Meineke Muffler, or PepBoys/Advance Auto
Parts for a free "Check Engine Light" diagnostic - they'll tell you the Error codes being posted by your car's computer.
Posted on May 14, 2011
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