# Base ignition timing (NA6)

Canonical URL: https://miatatorque.com/spec/ignition-base-timing-na6/

Applicability: NA 1990–1993 (B6, 5MT) — Other years in this family inferred from 1990 factory evidence with owner approval; actual-year verification is separate.

Confidence: fsm

10° ± 1° BTDC at idle speed

Always confirm against your factory manual. Match every restriction and follow all stages and procedure notes. Disputed claims must not be automatically resolved. The complete record below preserves every printed unit, source claim and procedure.

```json
{
  "id": "ignition-base-timing-na6",
  "name": "Base ignition timing (NA6)",
  "aliases": [],
  "applies_to": [
    {
      "gen": "NA",
      "years": [
        1990,
        1993
      ],
      "engines": [
        "B6"
      ],
      "trans": [
        "5MT"
      ],
      "note": "Other years in this family inferred from 1990 factory evidence with owner approval; actual-year verification is separate."
    }
  ],
  "kind": "non-torque",
  "value_text": "10° ± 1° BTDC at idle speed",
  "procedure": {
    "notes": "Warm engine to normal operating temperature, accessories off, transmission neutral. Use the specified system selector in SELF TEST or connect TEN to GND at the diagnosis connector. Do not ground the separate blue one-pin power connector. Remove the jumper/SST after adjustment."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "fsm-1990",
      "page": "B–8 (PDF p. 35)",
      "as_printed": "Ignition timing: 10° ± 1° BTDC (at idle speed)",
      "verified_years": [
        1990,
        1990
      ],
      "document": {
        "id": "fsm-1990",
        "tier": 1,
        "title": "1990 Mazda MX-5 Miata Workshop Manual",
        "part_number": "1193-10-89C",
        "covers": [
          {
            "gen": "NA",
            "years": [
              1990,
              1990
            ],
            "engines": [
              "B6"
            ]
          }
        ],
        "url": "https://archive.org/details/1990-mazda-mx-5-miata-workshop-manual_202411"
      }
    }
  ],
  "jobs": [],
  "system": "ignition-electrical",
  "component": "gap-followup-2026-10",
  "componentName": "Additional factory manual gap audit",
  "sequence_diagrams": [],
  "url": "https://miatatorque.com/spec/ignition-base-timing-na6/"
}
```