1 NZ-FE Axio 1.5 knocking issue

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1 NZ-FE Axio 1.5 knocking issue

I own a Toyota Axio. I have driven it up to 120, 000kms. Now the car has an issue of knocking which starts after when I cover a distance of 5 kms after starting the car. But in cold there is no knocking. After that the acceleration of the car becomes normal. Only when I increase the speed of the car the knocking starts and the rpm decreases near 1100. The knocking vanishes when when rpm is increased while pressing the accelerator. Ive changed air filter, oil and oil filter, cleaned throttle body... Replaced coolant. CVT oil also replaced with the correct procedure and Toyota original CVT oil TC.fuel filter and pump also replaced recently.
Earlier, I check that the engine had a thick oil and there was no knocking and I replaced it when I purchased the car. Currently I am using the in shell helix HX-7... No CEL is on and scanner shows no pending codes.
Is it due to timing over advanced when rpm s and knocking is caused???? Is the oil too thin for the age of the engine and oil pressure gets low?? Plz comment on this issue... Otherwise the engine is perfect and theres water in the exhaust and no oil o r carbon... Acceleration and consumption is also good. Only the knocking is bothering...

Sajid Khan asked on 23 Dec 2022 17:20:25 pm

1 Answer

2 views |

Sumaiya Akbar - on 24 Dec 2022 14:37:14 pm

Try dumping your current fuel and use Shell V Power. I had the same issue with my lancer. I had plugs changed, the fuel system cleaned, and all. The issue was ultimate that fuel was bad. My car loves Shell V Power. I used to fill PSO and Total HOBC but that was also of poor quality and the car would knock. The knocking vanished the moment I filled my tank with Shell HOBC and have used V Power since it came. Dont know if their fuel improved after the introduction of the new brands.

These newer cars have knock sensors and many other sensors designed to detect and eliminate knocking in real-time. The only thing that beat them is if the fuel RON Rating is lower than that for your car. Usually, its RON 90 for most vehicles nowadays. The cars ECU cant adjust the timing if the fuel quality is lower than the minimum.