Remembering why I
dislike working on
AO Silver Member
Join Date: Sep 2001
My first thought after hearing it was the same as TOPKIT - slight leak at an exhaust port when cold. I say that, as it only seems to do it on acceleration....
The tensioner...well, before diving in, run it up like that and watch what it does. It'll tend to wave about quite a bit as you rotate the engine anyway - that's normal as the tension varies on the slack side due to valves opening/closing. Or, see where it sits with the engine at #1 TDC
BUT, as bgunn says...any doubts, change the belt, idler & tensioner. Not cheap...but cheaper & quicker than an engine rebuild.....