🚗 Classic Fault — Mercedes-Benz W115 (1968–1976)
Carburetor icing in cold humid conditions
💰 Estimated Repair Cost
$15 – $40 USD
Parts and labour estimate
🔧 Tools Required
None for diagnosis
📋 Overview
In humid conditions just above freezing, moisture in incoming air freezes around the throttle plate. The engine stumbles or stalls then clears as the engine warms. More common on the W115 because the carburetor is not heat-soaked.
🩺 Symptoms
- Engine stumbles and almost stalls in cold damp weather
- clears after a few minutes
- no fault found on inspection
🔍 Possible Causes
Carburetor icing — water vapour freezing at throttle plate in cold humid air
🛠️ Diagnosis Steps
Observe weather conditions when fault occurs. No mechanical fault will be found on inspection.
✅ Most Confirmed Fix
Fit warm air intake hose directing warm air from exhaust manifold area to air filter.
77% of users confirm this fix worked (18 reports)
🏷️ Parts Needed
Warm air intake hose and bracket
🔗 Other Mercedes-Benz W115 Faults
Own a Mercedes-Benz W115?
Share your experience with this fault — or report a different issue. Your knowledge helps other classic car owners worldwide.