My 2001 Toyota Avalon with 260 K on RPM fluctuate frequently and running rich

Asked by Jun 10, 2017 at 03:37 PM about the 2001 Toyota Avalon XLS

Question type: Maintenance & Repair

My 2001 Toyota Avalon with 260 K on it running rich and RPM fluctuate frequently  

My 2001 Toyota Avalon with 260K on it is running too rich. I do not get good mileage. When I start the car in the morning, the RPM goes up 3K and after 3-5 minutes it goes down. It also makes rattling sound at the start. When I drive the car, the RPM fluctuates a lot even if I don’t push on gas paddle.
I changed oil filter, air filter, new Mufler and also change oil on regular basis. Please help me to find out the problem.  I wanna keep it for another 100 K miles. Thanks a lot.



1 Answer

292,805

Rattling noise at start? Is it the engine making the noise? Check the belt and accessories? Clan the throttle body? Did you check for vacuum leaks, scan for the codes? O2 Sensors original?

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