AFM (Airflow Meter) Contamination
Symptoms
Rough idle, hesitation on acceleration, poor fuel economy, rich or lean running.
Cause
The GT-R uses twin hot-wire airflow meters (one for each turbo). The hot-wire elements become contaminated with oil vapour from the PCV system and general intake air contamination. The contaminated element gives incorrect readings, causing the ECU to miscalculate fuel delivery.
Fix
Clean the AFMs with MAF sensor cleaner spray ($15-20 per can).
Do not touch the hot-wire element with anything, only spray cleaner.
If cleaning does not resolve the issue, replacement AFMs are required: $300-500 each.
Many modified cars delete the AFMs entirely and run a MAP (Manifold Absolute Pressure) sensor-based tune instead.
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