I have a 2001 toyota corolla and I would like some help explaing why I have a ( spark knock ) in my engine! I have changed the spark plugs thia car has ignition coils so theres no wires or cap! Also I have used high octane fuel! It seems that its worse when I go up hill or theres strain on the engine! Please help

Hi

Thanks for using FixYa. Stalling of car uphill suggests that the fuel filter is clogged. You can try to unclog it by removing it. If you found it very hard to clean then i'll suggest you to replace it. Please follow this procedure--

• Open the hood and look on the driver's side to find the fuel filter. It is a somewhat small canister attached to the fuel line.

• Disconnect the negative battery cable, and wait 90 seconds or more as a precaution against disturbing the air bags. Remove the protective shield around the fuel filter. If the air cleaner hose and cap and the charcoal canister are in the way, remove them as well.

• Loosen the lower flare nut slowly to allow all the pressure out. Take off the banjo fitting and the two metal gaskets. Next disconnect the fuel line from the fuel filter. Finally, take the filter out of the mounting bracket.

• Slide the new fuel filter into the mounting bracket and hold it with the arrow pointing toward the engine. Place a new metal gasket on each end. Attach them with the union bolt.

• Tighten the flare nut on the lower connection. Put the charcoal canister back, along with the air cleaner hose and air cleaner cap if you removed them. Reattach the protective shield and hook up the negative battery cable. Check for leaks when you start your car.