1986 Corvette enters limp mode with Code 33 when accelerator pedal is held at a specific position, despite replacing TPS, MAF sensor, and relays.

Standard part replacement did not fix the problem; the owner lacks a targeted diagnostic tool for intermittent electrical or vacuum issues related to a specific pedal position.

Severity

4High

Willingness to Pay

implied

Added

Jun 3, 2026

Workarounds Described

avoids specific pedal position to prevent limp mode
turns car off for 15 seconds to reset code

Implied Software Gaps

Diagnostic tool that correlates pedal position data with sensor readings to pinpoint intermittent faults
Enhanced scan tool with waveform capture for pre-OBDII vehicles

App Concept

CodeKill Pro

CodeKill Pro is a mobile diagnostic app that uses your phone's sensors and an OBD-II adapter to log sensor data at precise pedal positions, identifying intermittent faults in wiring, vacuum leaks, or ECM glitches. It provides step-by-step guided tests and community-sourced fixes for classic car limp-mode issues.

Key Features

Real-time data logging triggered by engine code or pedal position
Community trouble code database with verified repair stories
Guided diagnostic workflow for intermittent faults
Integration with classic car ECMs (pre-OBDII via adapter)

Target Users: DIY classic car owners and hobbyist mechanics working on 1980s-1990s GM vehicles with intermittent engine codes

Revenue Model: $9.99 one-time app purchase plus $4.99/month for cloud data analysis and community access

Existing Solutions Mentioned

replaced TPSreplaced mass air flow sensor and relays

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