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View Full Version : Strange advance behavior - 2006 Silverado 5.3 LS1B controller


trimchip
April 27th, 2015, 06:06 PM
Engine misfires under medium and full load, and sometimes under steady conditions.

Advance and KR behaves strange.

Could it be a sensor fault?

1831418315
joecar
April 28th, 2015, 05:14 PM
Also post your tune file.
joecar
April 28th, 2015, 05:15 PM
What engine mods...?
trimchip
April 28th, 2015, 06:53 PM
Std tune. Cleaned main terminals on battery and main grounds. Also cleaned connectord to Pcm.
Checked for leaks on manifold - none. Also coil #5 was misfiring periodically under load.
I think a bad ground connection caused the 45 deg retard on ignition.
The bad coil also really made it cough and perform bad. It's ok now, only a few occational high rpm misfires on first gear
@wot. Possibly the plugs