I cannot find a clear vacuum diagram or source for components to restore the vacuum system on a heavily modified 1982 Chevy G30, leaving me unable to get the engine to start, idle, and accelerate properly.

Existing diagrams are for unmodified California emissions models and don't match the altered system; no source exists for simplified, generic vacuum routing for older vehicles with modifications.

Severity

4High

Willingness to Pay

implied

Added

May 2, 2026

Workarounds Described

studying factory California emission diagrams that don't match the modified engine
tracing cut/spliced vacuum lines manually

Implied Software Gaps

Customizable vacuum diagram generator that accounts for emissions deletes and modifications
Parts identification database for vacuum components with photos

App Concept

VacRoute Pro

VacRoute Pro is a mobile app that provides interactive, customizable vacuum diagrams for classic vehicles, especially those with modified or deleted emissions systems. Users input their engine specs and modifications to generate a simplified vacuum routing diagram optimized for basic operation (start, idle, accelerate). It also includes a parts identification database with photos and sourcing links.

Key Features

Input engine make/model/year and list modifications to generate a custom vacuum routing diagram
Step-by-step guided rebuild with 3D animations of vacuum circuits
Visual parts identification tool with images and direct links to purchase components
Community-shared diagrams for common modifications and emissions delete setups

Target Users: Classic car and truck owners, DIY mechanics, and small auto repair shops working on pre-OBDII vehicles with modified or missing emissions systems.

Revenue Model: $9.99 per diagram download or $4.99/mo subscription for unlimited diagrams and access to parts sourcing

Existing Solutions Mentioned

factory emission diagramgeneral vacuum diagrams

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