I have a 2003 Toyota Corolla with 90000 miles, that gets regular maintenance.
I’ve tried taking it to the dealership, but all they want to do is blindly follow their flowchart, making me spend lots of money in the process. Per their instruction, I’ve already replaced the battery, I’ve done a tune up, including spark plug replacement.
I think it’s probably some sensor that is busted. The car has 90000 miles now (I bought it 3 years ago with 59000), and it didn’t have this problem before. In the past, it wouldn’t rev high. But now, the revs wont go back to normal unless you spend a good 10-15 minutes in park until it “warms up”, even though this also occurs in the summer.
Generally though the car has run great. It just revs high when starting up in the morning.
Can anyone identify some of the main causes of this symptom. Coincidentally, every used car I’ve ever owned eventually gets this problem.