there seems little info about this on this site. any advice, tutorial i overlooked?
im trying to get rid of random knock on cos3. most of the tables mentioned in the few posts i found are not there. 6246, 6247, 6228 are zeroed out. confusing.
there seems little info about this on this site. any advice, tutorial i overlooked?
im trying to get rid of random knock on cos3. most of the tables mentioned in the few posts i found are not there. 6246, 6247, 6228 are zeroed out. confusing.
At what rpms does this knock occur?
2005 1500 HD , Custom OS3 SD tune .
2006 Trailblazer
Dinosaurs and Plants gave their lives so that we may drive , long live fossil fuel .
as mentioned its random knock when accelerating (none at redline so far) but also in situations where engine cant knock, especcially in view of the high octane gas it drinks. im logging burst and its not related, i saw it only a couple of times.
so which of the tables would be a good starting point? im talking about values of typically 0.5-2.0 degrees btw.
Last edited by dian; October 16th, 2017 at 08:53 PM.
B6250 and B6255 are the tables you are looking for to change. What are your numbers there?
Thanks
"All that is needed for the triumph of evil is that good men do nothing..."
Sorry, somehow thread was dropped, I don't know what happened.
b6250 is 15 up to 3200 rpm and 13 from there. 6255 is 13.
is there a writeup or something somewhere? it looks quite involved. no idea what rpm and tps knock modes are. a lot of stuff multilying ittself. a/b tables are for when not in rpm or tps mode??? i would have thought 6242 is the one to play with (is 255). os 0202003(and a lot of confusion) here.
btw, stock/original 6250 oscilates between 9 and 11 up to 4000 rpm and is 11 from there. no 6255, no rpm mode apparently, 6242 is 245.
When the ECU is in transition meaning RPM is increasing it will use the TPS and RPM tables. whichever is higher it will use.
When its in steady state it uses the per cylinder numbers.
"All that is needed for the triumph of evil is that good men do nothing..."
There's a page here, that might help.https://forum.efilive.com/search.php?searchid=2311546 ,
Last edited by Chevy366; December 28th, 2017 at 10:54 AM.
2005 1500 HD , Custom OS3 SD tune .
2006 Trailblazer
Dinosaurs and Plants gave their lives so that we may drive , long live fossil fuel .