Gm Mode 22 Scan Tool By Terry ((free)) -

The is a specialized, often free software utility designed for deep-level diagnostics on General Motors vehicles, typically used in conjunction with low-cost ELM327 OBD2 interfaces . Overview of the Tool

1991 Camaro 5.7L TPI has hesitation under load. Solution: Log Mode 22 data during a test drive. The log shows the knock sensor pulling 8-10° of timing at 2500 RPM, but there is no audible knock. Replace the knock sensor (false triggering due to a loose torque converter bolt). gm mode 22 scan tool by terry

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