rich Z

I added a Greddy catch can, 3 treatments of seafoam, new fuel filter, new spark plugs and had the stock maf replaced under warranty and still have 2-10 degrees of kr with most pinging at part throttle. Some pinging at wot, varies a lot. Gets tons worse with predator tune. Without tune or with tune my Lt's are a positive 4-8 and go to 2.34 at wot with only 17 degrees of timing because of all the damm kr. I'm gonna try using my maft again since I haven't in months.

Texas Terminator

what all have you done to your motor? need more info.

samz28

throw 20% toluene in there and see whats up

maybe its your starvin marvin gas?

jimmyblue

iTrader: (11)

It would be very good to get a logger on there and
see if it's single-cylinder or all cylinders (look at the
misfire active and history). Single cylinder lean (like
from crudded injector, or bad intake O-ring) would
be very visible there.

samz28

doesnt that predator thing log? i like efilive 6.3.3 myself

jimmyblue

iTrader: (11)

Predator only displays a limited set of params,
real-time, and misfire count isn't among them.

I like EFILive too (bought it, but haven't gone
and updated since 6.2.x). Maybe there's somebody
running around his locale who has that or 'Tap
and could help him out.

rich Z

Opps my car is a 02 Z28, m6 with just a lid and predator as hp mods. The car has almost 17k miles and started this pinging, kr thing around 5K miles. I have a maft that I hooked up today and set the base at 10% rich and that got my lt's to a negative 2-3 and 0 at wot but my timing sucks at 15-17 degree's at wot and I still get some kr around 4 degree's. I don't even wanna think what the price of 100 octane is now since I'm paying 2.40 for 91 here in CA.

ssfiress

go to a tuner. i had the same problem with my ss at around 17k miles. i descreened my maf at around 10k miles and it started pinging at wot and then i replaced it with a stock one with the screen still intact and it still did it. replaced my fuel filter then plugs and wires and still did it. couldnt understand why so then i went to a tuner and at wot i was pulling 9* of KR he pulled mad timing to combat the KR until it finally stopped but then i had a hell of a lot less timing which sucked. after i got my cam i tuned it again the dudes computer flamed out when it was at 96% loaded. it fried my pcm!! i was pretty pissed but he got me a brand new computer and had it flashed for my car. the thing is that there was a updated file that had a revision for the false KR the the computer was picking up with the old puter and the car runs better than when i got it brand new. i dont know if it makes sense but there it is.


get it tuned by someone or have an updated file for your car flashed to your pcm.