Audi Q5 Technical Service Bulletin # 011125 Date: 110616
Fuel Sys. - Long Crank Time/Rough Idle With Hot Engine
01 Extended cranking time when engine is hot and/or rough idle after startup
01 11 25
2026718/1
June 16, 2011
Affected Vehicles
Condition
^ Extended cranking time when engine is hot and/or rough idle after startup.
2010 Audi Q5 Quattro (8RB) V6-3.2L (CALB) Page 341
^ No DTC is stored in ECM memory.
Technical Background
One or more fuel injectors may be stuck open, allowing fuel to enter the combustion chamber when engine is hot. Drop in fuel pressure may cause
delayed restart of the engine, ("long crank") and/or rough idle after startup.
Production Solution
Not applicable.
Service
1. Bring engine to operating temperature and continue to hold the engine at 3,000 RPM for an additional 5 minutes, so that the engine is hot.
2. Observe MVB "fuel rail pressure, actual value" to determine rail pressure. Should be at ~35000hPa (~35 bar).
3. Turn engine off.
4. Monitor MVB "fuel rail pressure, actual value".
If the pressure decreases to ~25000 hPa (~25bar) within 10 minutes, remove the plugs and check possible fuel ingress in cylinder (or combustion
chamber.)
WARRANTY
REQUIRED PARTS AND TOOLS
ADDITIONAL INFORMATION
All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service
manuals for the latest information.
Fuel Sys. - Long Crank Time/Rough Idle With Hot Engine
01 Extended cranking time when engine is hot and/or rough idle after startup
01 11 25
2026718/1
June 16, 2011
Affected Vehicles
Condition
^ Extended cranking time when engine is hot and/or rough idle after startup.
2010 Audi Q5 Quattro (8RB) V6-3.2L (CALB) Page 341
^ No DTC is stored in ECM memory.
Technical Background
One or more fuel injectors may be stuck open, allowing fuel to enter the combustion chamber when engine is hot. Drop in fuel pressure may cause
delayed restart of the engine, ("long crank") and/or rough idle after startup.
Production Solution
Not applicable.
Service
1. Bring engine to operating temperature and continue to hold the engine at 3,000 RPM for an additional 5 minutes, so that the engine is hot.
2. Observe MVB "fuel rail pressure, actual value" to determine rail pressure. Should be at ~35000hPa (~35 bar).
3. Turn engine off.
4. Monitor MVB "fuel rail pressure, actual value".
If the pressure decreases to ~25000 hPa (~25bar) within 10 minutes, remove the plugs and check possible fuel ingress in cylinder (or combustion
chamber.)
WARRANTY
REQUIRED PARTS AND TOOLS
ADDITIONAL INFORMATION
All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service
manuals for the latest information.
