1998 Suzuki Alto Works engine stutters during off-boost cruising at around 4,000 RPM despite replacing multiple parts, causing rough driving and uncertainty about which component is faulty.

Existing diagnostic tools and trial-and-error part replacement are costly and time-consuming; no affordable, accessible diagnostic tool specifically for older JDM engines to pinpoint off-boost drivability issues.

Severity

3Medium

Willingness to Pay

implied

Added

May 25, 2026

Workarounds Described

runs trial-and-error part replacement (spark plugs, dizzy cap, actuator, etc.)

Implied Software Gaps

Diagnostic tool that can read pre-2000 JDM engine sensors and provide guided troubleshooting for part-throttle stutter issues.

App Concept

JDM Drivability Pro

A mobile diagnostic app paired with an OBD-II adapter that supports older JDM protocols (e.g., Suzuki HA11S). It guides users through systematic sensor testing (TPS, FPR, MAP) with real-time data logging and a symptom-based diagnostic tree, reducing guesswork and part replacement costs.

Key Features

Legacy JDM protocol support (pre-2000 OBD-I/II)
Guided diagnostic workflows (stutter, hesitation, surging)
Real-time sensor data plotting (TPS, MAP, RPM, fuel pressure)
Part replacement recommendation engine with cost estimates
Community-driven fix database for kei cars

Target Users: Owners and DIY mechanics of 1990s JDM vehicles (kei cars, turbo imports) in North America, Europe, and Japan.

Revenue Model: $9.99/mo subscription or $49.99 one-time purchase for full diagnostic tree; plus in-app purchases for expanded vehicle profiles.

Existing Solutions Mentioned

Replaced spark plugsReplaced distributor capCleaned rotor armReplaced actuatorAdded boost solenoidUpgraded dump valveBoost gaugeFuel filter

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