Quote:
Originally Posted by sukheshkumar  I think it is Premium Petrol which is the reason for this knocking.
Earlier, sulphur was added as an additive to induce anti knocking properties.
With the advent of Green marketing, the same additive is considered as an impurity and premium gasolenes take this out of Gasolene.
Reduction of knocking is done by car makers. I do not know whether alto manual prescribes Premium Gasolene. |
I thought it was lead that had the anti-knock properties? All fuel supplied today is unleaded. Instead of lead the premium fuels have other additives that effectively increase the peformance of the engine and should help in reducing knocking unless the Alto's ECU is unable to adjust to these premium fuels. I have been using Speed 97 for some time now in my Santro and the pickup is noticeably better.
Edit: The knocking could also be due to some blockage in the fuel supply,and the car may be running a lean mixture. Check fuel filter, fuel pump, fuel lines and injectors in addition to the ignition timing. Fuel quality could also be the culprit, as pointed out by others.