Hum at idle from the water pump (TSB 93-034)
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What causes "Hum at idle from the water pump (TSB 93-034)" on the Honda Civic EG (1992-1995) and Civic del Sol (1993-1997), and how is it fixed?
Water pump noise, per Honda's bulletin. Fix: Add Honda water pump lubricant to the coolant as the bulletin directs before replacing parts.
Symptoms
A hum below about 1,100 rpm with the engine warm, easily mistaken for the alternator.
Cause
Water pump noise, per Honda's bulletin.
Fix (summary)
Add Honda water pump lubricant to the coolant as the bulletin directs before replacing parts.
Related build entries
Other EG problems
- Recall 94V-063: automatic shift cable clip can come off
- Recall 93V-208: wrong passenger airbag inflator (1994, 31 cars)
- Recall 95V-203: del Sol passenger airbag retainer tabs drilled wrong (1994)
- Shake on light braking at 35-45 mph (TSB 92-031)
- Premature tire tread wear (TSB 93-029)
- Knock from the front end: stabilizer bushing moves (TSB 93-030)
More for this car
- All Honda Civic EG (1992-1995) and Civic del Sol (1993-1997) fitment answers · EG common problems
- Newsletter archive: past issues with every new and corrected entry
Sources
- Honda TSB 93-034: Engine - Noisy Water Pump (1992-93 Accord and Civic) — American Honda (service bulletin) via Operation CHARM (mfr spec; read 2026-10-26; full page read)
Summaries are in our own words. Not repair instructions; consult the factory service manual.
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