[camppain]

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (HippoSleek @ June 14 2002,04:17)</td></tr><tr><td id="QUOTE">Anyone know if the knock sensor program in the ECU maintains retarded timing after repeated knocking?

What I'm getting at is that sometimes a motor learn to accept running like sh!t. If that becomes part of closed loop operation, it requires an ECU reset to regain the benefits.

I'd say a tune up may be in order (and you are definately going to have to get used to power ENDING at 5500, not beginning), but I would try running a couple tanks of premium, then resetting the ECU and see if the knock sensor ECU program is involved. Can't hurt.</td></tr></table><span id='postcolor'>
and for some reason nissan decided that if your knock sensor goes bad or senss something wrong it wont trip a dtc. so thats something you find out if yuour checking on another code.

and yosho is pretty correct in how he explained higher octane is needed.

also if you advance your timing you will definately need higer octane due to your spark firing sooner(not a word)