Hi - I have a 2000 Toyota Corolla with the 1ZZFE engine with the timing chain. It has 135K miles on it and I need an expert. I am hearing occasional engine knock under moderate load but only after engine is warmed up. Sounds a lot like an EGR problem but I have not found anything that looks like an EGR valve on the engine. Did Toyota come up with some other way to do this? I have already replaced the catalytic converter as advised by mechanic but it did not improve the problem. Premium gas will suppress the knock but I am sure that is not the right answer.
Monday, February 13th, 2006 AT 3:35 PM