Hi, I am new to this forum and I am looking for help. I have a 2002 kia sportage with 2.0 eng. I have changed the timing belt before without any problems but,when I changed the timing belt this time and the engine starts spark nocking. it never has done this before I don't know if it just happened to start when I changed the belt or if it is something I missed this time. all marks were lined up by manual instruction as before. after I filled the tank up it started spark nocking. add additive to it and stops for awhile. so I thought bad gas.after another tank of gas still has spark nock when engine is under load,like when running ac. it tells you in manual to dis connect battery so sensor can reset.while you are changing belt out. is there a way to adjust timing?