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Thread: Geartrain noise in 4L60E second gear causing "knock" retard

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  1. #1
    Fuel Injected!
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    Geartrain noise in 4L60E second gear causing "knock" retard

    I am about to pull my hair out with this one. Have any of you seen a transmission cause false knock only in 2nd gear??? I can hear a whine in the transmission at about 4,000+ in second gear. At 4,400 I start seeing knock retard that quickly peaks 8°. I can slightly reduce the "knock by retarding the timing to rediculous values but not eliminate it. I made a run from a standing start to better than 90 mph and practically no knock in 1st or 3rd gear but massive amounts in 2nd that vanishes quickly after a WOT 2-3 shift, despite the engine being under more load, with more timing and less rpm.

    Prior to the 0411 swap I ran a LT4 knock module and rarely ever saw knock retard even with 26-28° total advance.

    Edit---This was meant for the OBD2 board...Darn phone.
    Last edited by Fast355; 04-13-2013 at 05:12 AM.

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