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MK3 / A70 markets
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Troubleshooting assistant

Pick a problem area, choose the symptom, then follow the remedy links or step-by-step TSRM procedure.

Diagnostic codes
Searching in 1990 USDM TSRM.
Areas /Engine backfires — lean fuel mixture
EFI System

Engine backfires — lean fuel mixture

Lean backfire procedure.

Step-by-step guide available. Use this when the remedy table sends you to a troubleshooting procedure.
Start guide
Possible causes and remedies
Possible cause
Symptom matches EFI flowchart
Remedy
Follow the step-by-step TSRM troubleshooting procedure.
FI-19 Guide
A70 knowledge graph
Automatically linked from codes, vehicle context and archive references.
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