I own a 2000 rx-300, I purchased it with 55,000 miles it was a one owner. My wife drives this car and we have the oil changed every 4000 miles. we had the local toyota dealer do the 60,000 mile maintaince/ check up they did not report any problems. the car now has 90,000 miles on it and the check engine light stays on. I asked some toyota tech.s and they informed mr that it was probally due to the car needing its 90,000 mile dealer checkup. the car began making a thumping noise and stoped on my wife last week. I was advised it was a timing belt failer. I purchased a new belt and tension , from toyota and installed. After all of this I cranked the engine and it began making the same noise and cut off, the check engine light was blinking as well as the oil light. I changed the oil and filter myself about two weeks ago and took the oil pan off to install new gasket sealent, I noticed that the pan was burent looking and the oil pick up screen was almost compleatly cloged i took the pick up off and cleaned it in my parts washer and cleaned the inside of the pan as well, and reinstalled both. I called the toyota dealer about this problem and they dont seem to know what the problem might be, I am thinking the moter might be shot due to sluge. I need advise on what to do next, like most people we a tight with money now and i dont want to spend alot of money just to find out that the engine is shot. PLEASE HELP!!!