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knock sum gauge goin crazy

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Vicious_mole

15+ Year Contributor
135
0
Jun 3, 2005
Granger, Indiana
found this log and were the black line is that about where i took the data out of the log data you can see the timing drop about 13*, this was at about 60 mph with the crusie set, not sure y the knock sum is goin so crazy, but i don know its pulling timing like crazy. it maily happens when the turbos not pushing any boost just crusing at a constant speed, anyone have any ideas?


might i add i took the plugs out and the looked pretty white, i need to pull again to double check but were pretty white im thinking about throwing in the stock ecu and injectors to see if it stops picking up knock

log pic
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log data

Time -Load- Rpm- Timing- Airflow- Tps-
58.61 -29.47- 2452.0- 35.0- 2.66- 14.15-
59.40 -29.86 - 2440.0- 35.0- 2.68- 14.15-
60.23 -31.43- 2436.0 - 35.0- 2.8- 14.54-
61.04 -33.01- 2424.0- 33.0- 2.91- 14.93-
61.85 -34.18- 2428.0- 22.0- 3.06- 15.32-
62.64 -34.97- 2424.0- 22.0- 3.17- 15.72-
63.45 -36.15- 2424.0- 22.0- 3.29- 16.11-
64.26 -36.54- 2428.0- 23.0- 3.36- 16.11-
65.07 -36.15- 2436.0- 23.0- 3.37- 16.11-
65.88 -34.58- 2452.0- 24.0- 3.27- 15.32-
66.67 -32.61- 2448.0- 25.0- 3.05- 14.93-
67.48 -31.83- 2452.0- 25.0- 2.96- 14.54-
68.28 -29.47- 2448.0- 26.0- 2.81- 13.36-
69.09 -26.72- 2456.0- 36.0- 2.48- 12.57-
69.90 -24.36- 2468.0- 36.0- 2.26- 11.79-
70.70 -23.97- 2452.0- 36.0- 2.14- 11.39-
71.50 -25.54- 2456.0- 36.0- 2.22- 12.18-
72.32 -26.33- 2452.0- 36.0- 2.34- 12.57-
 

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Potentially phantom knock, a bumpy road (causing phantom knock), or a dead/dying knock sensor. I'd replace it if you haven't in the last year or two (or at all), just to be on the safe side.
Though your airflow DID jump a lot, and dropped back down right when the timing climbed up again. Maybe you hit a cold spot, or your MAS screwed up and read high.
 
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