Hi All, I have annoying problem that has come up with my 12/2003 TOYOTA COROLLA (ZZE123R-GHFQFQ). The only way I can describe the problem is a "Tick-Tick" noise as you accelerate or idle, it reminds me of the FORD falcons or Fairmont’s Tappid noise. This noise comes after the car has warmed up and going, but initial engine start there is no noise. I have asked a mate who works in Toyota to ask around about the problem but his telling me the mechanics are puzzled as they are saying Corolla’s don’t have Tappid that make noise like that or are adjustable? It’s really hard for me to explain this as am not that good with mechanics but have a general idea. What I have tried is an additive to thicken the oil to see if it’s my oil being too thin and that it’s not covering the pistons or something. This did not work Lifter-Free and Tune-Up . "Does your car engine rattle or make a tick, tick, tick (ticking) noise On start-up? Lifter-Free & Tune-Up will help. It dissolves and dislodges harmful varnish and carbon deposits that accumulate within and around hydraulic lifters and cam followers without causing any damage to oil seals or gaskets." Can anyone relate to my problem and give me a general idea what I am dealing with? Would resetting my ECU help solve this problem or is it completely irrelevant? Btw I use BP Ultimate (premium) fuel if this helps. I was thinking of doing a full Oil change and Oil filter etc., but I read this might be a waste of time or make the noise get worst. Any help would be appreciated!! Cheers Mark