So I have a couple questions pretty sure you guys are it on figuring things out so I just bought an 06 sc with 104000 miles and when I first test drove it it was predentonationg as if low octane but I asked the guy and he said yes I put 87in it so I immediately filled the tank with 91 ran a tank and filled again with 91 and I'm still getting the same rattle as if there's 87 in it when the throttle is bout half or more... Any clues guys, I'm thinking tensioner so I bought a cloyes one and went to put it in on incase that's it but I'm also weary because I've seen the how to thread on this and just zip tying the chain to the sprockets up top seems to work by the looks of it but has me sketchy is what about the crank sprocket? Won't the chain jump down there? Just the last thing I wanna do is mess it up...

 

New here as well but here is the advice I would give you; open the front cover and get a good look at everything when you are doing the work. It is tedious an a bit or a pain, but it will put you at ease when putting everything back together. The zip tie trick is fine for making sure that the cams don't move, but taking the cover off and knowing the chain didn't move around on the crank after the tension was off is just as important. I just redid my whole timing set, and before I threaded the tensioner back into the hole I made sure everything was lined up and nothing was kinked by having my buddy hold the correct link on the crank sprocket mark and put a long screwdriver through the tensioner hole. That way I could push the guide in and see where the tension was coming out of the chain. Make sure to set the tensioner before putting the valve cover back on!

 

Your a saint much appreciated my good man!