OK, I'm running the cheapest Mid grade I can have and I've detected a "knurling" sound when my girlfriend is pulling off in it. I keep the RPM's up higher when I accelerate so I've just heard it. So, what kinda damage can this cause and how will it take before causing real damage. Thank Y'all. ------------------ Pretty damn smart with cars for 17! 91 Camaro RS, 305 TBI 92 Lumina, 275,000mi and humping! No mods yet...Hopefully: Convert to dual-cat with headers and Borla catback exhaust. 350hp 305TBI I dont care what you say!!!! RAM air hood & Z28 wing. ABS system. Positraction rearend with rear disc brakes. Rebuilt front and rearend suspension with polygraphite bushings. Strutbrace. Rollbar. Subframe connecters.

you shouldn't have any knock problems if everything is working correctly. if the senser picks it up the est corrects for it.

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ICON Motorsports

1st & 3rd

ok that may be over simplified, but if the base timing is correct, right gas good tune up you should be ok. if you do hear/have something i'd be checking it out.

Maybe it is not "knocking/pinging" that you are hearing. When it occurs, it sounds like "marbles rattling around in a tin can".

The stock GM eprom is pretty mild IMO and the knock sensor is set to be "overly" sensitive. Unless you've advance you timing to over 10*, some high compression, heavily carboned up, disabled the EGR or some REALLY bad gas, you should be able to run Mid Grade with absolutely no problem.

With my L98, I run 42-43* when operating in "normal" 14.7:1 on part throttle. And when Highway Mode invokes, I run 47* with 17.6:1, with no pinging.