Promod Posted February 2, 2011 Share Posted February 2, 2011 The Patient: 1999 RX 300 with 210,000 miles The problems: 1.) Under normal acceleration, at times it will act like the power is of/on like a light switch. It's not a miss, it's more like a surge off/on. This typically happens in 2-3 gear. 2.) Under acceleration, the engine is very rough. This may actually be the transmission and not the engine, I don't know for sure. 3.) Noticed that the headlights flicker. 4.) Only code that keeps coming back is P0446, no others (I have an Actron CP9145 I keep in the car) What I have done to the vehicle since purchasing it a month ago 1.) Oil change with Mobil 1 and a pint of MMO 2.) Pulled front Oil Control Valve and cleaned (did have misfires on all front cylinders) gone now. 3.) New PCV Valve / Air Cleaner 4.) New NGK Plugs (OEM recommended) 5.) Pulled front valve cover and oil pan/pickup to check for sludge and they was as clean as one would expect for the mileage) I really like this vehicle and would like to get these bugs worked out. If anyone can offer suggestions on what to check for I would appreciate it. Thanks in advance! Quote Link to comment Share on other sites More sharing options...
lenore Posted February 2, 2011 Share Posted February 2, 2011 hERE IS a posting from clubl lexus that may be worth checking out... http://www.clublexus.com/forums/rx-first-generation/246678-check-engine-code-po-440-po-446-a.html Quote Link to comment Share on other sites More sharing options...
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