Dear forum members,
I seek your advice for my toyota vitz (also in your opinion is there a good mechanic in Lahore (ideally near Defense) who understands Vitz?)
my observations for the car are as:
1- The car is 1000CC, 2010 model, 2013 import.
2- Mileage is around 110,000KM
3- it has been subjected to regular maintenance, oil (OIL) has been changed even 4000KM, and tune up including clean up of spark plugs, carburetor has been done about 6000-8000 KM (the last tune up was done 3000 KM back and oil change done 1000KM ago. Car battery is also new.
4- When I use a combination of high-octane and normal petrol, the car runs good, however in last month or so I have not been getting hi-octane and running it on normal petrol and for this reason, I am thinking that the problem that I am describing is related to engine knocking.
5- when the car is driven in the morning, generally it takes some time to give some noise but the noise is more common in the afternoon or evening. Even in the evenings car produces no noise at low speeds.
6- When I am accelerating the car above 50-60 KM, I observe knocking which goes away when I remove my foot from the accelerator.
7- I also feel that car runs a bit heavy, for example, from 0 KM-60 KM I am feeling less pick in the car (may be that is the way with 1000 cc cars and I am just feeling it more at the moment).
8- Also some times horn sound is alright, but sometimes it comes out quite bad as if someone has grabbed horn from throat.
Can you please suggest what is going on? If it is because of knocking, then besides using a mixture of high-octane/normal petrol, is there a way to clean the engine to reduce/eliminate noise?