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Old 10-13-2012, 01:51 AM   #26
NSFW
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Originally Posted by Uncle Scotty View Post
change the front o2 sensor
What makes you say that?
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Old 10-13-2012, 01:53 AM   #27
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heres one more data log that i did today with a 4th gear pull, lots of knock apparently. some thing with the tune? or could it be a faulty sensor?

https://docs.google.com/spreadsheet/...yUkhqLWc#gid=0
Try taking out some ignition advance - about as much timing as the ECU is pulling. If the problem goes away, then the problem was your tune. And I think that's what you'll find.

But if removing timing makes no difference, then it's probably noise, or possibly a failing knock sensor. I don't think that's the case though.
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Old 10-13-2012, 11:59 AM   #28
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so should i take out 2? just as much as it goes negative
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Old 10-13-2012, 04:54 PM   #29
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It pulls 4 degrees in places....

Remove timing from the RPM/Load areas where the knock happened, and smooth the timing tables around where you make the changes.

Are you going to be doing this, or will your tuner be doing it?
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Old 10-13-2012, 06:30 PM   #30
151sti
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my tuner will be doing this, id rather not attempt it and end up doing damage
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Old 07-12-2013, 02:37 PM   #31
151sti
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bummmp

this is still a reoccurring issue. we tried pulling 4* of timing out made no difference. could a boost leak cause this? maybe a tired tubo blowing hot hair in? anyone have suggestions???

It also has knock with the cobb stage 2 map as well as the stage 1 map. hope this helps someone!
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Old 07-12-2013, 03:12 PM   #32
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Who is your tuner? You can try putting some racegas in to see if it still knocks. You should also do a compression test. If you've been knocking this long you'll want to know if you've done any damage to the engine.
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Old 07-12-2013, 03:40 PM   #33
151sti
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ya that would be a bummer because the motor only has 20k on it. if it knocks at all the computer pulls timing and keeps it from knocking anymore. consequence obviously a huge reduce in power.
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Old 07-12-2013, 03:54 PM   #34
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I don't know what's wrong but if you want to.try the o2 sensor like stated above I would offer to.send you one of my spare ones to try out and if it ends up helping then I'll sell it to.you
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