As the title says, I'm experiencing some problems with my 2000 Corolla.
Every time I step on the gas, I hear a strange noise coming from the engine.. In spanish we say "pistoning", and it basically happens when the fuel is not being burnt properly and/or the "combustion" is not happening the way it should (that's what It could be, I'm not sure)
Another strange thing is: when idle, a small whistle sound comes from under the hood.
I believe those two problems above are related to the P0171 code. I've tried putting a plastic and covering part of the air intake to balance the mixture, but the code shows up again.
And also, I think not related to the code, I'm having some starting problems. Cold starts are normal and usually good, but when the car was used and the engine has been stopped for about 30min - 1 hour, I have to crank it way too much before it even tries to start.
Thank you !
No recent changes other than tires
I use Castrol 10W-30