2049586.4

Technical Service Bulletin
Topic
Market area
Brand
Transaction No.
Level
Status
Release date
Misfiring, W12 TSI - Excessive carbon build up cylinder leakage
Bentley: worldwide (2WBE)
Bentley
2049586/4
EH
Released for publishing
May 20, 2019
New customer code
Object of complaint
information, navigation, communication, entertainment -> malfunction display symbols -> emissions control
malfunction display
engine -> engine operation -> engine output characteristic -> engine output
Vehicle data
W12 Bentayga - New Continental GT - New Continental GTC
Sales types
Type
3S3*
3S3*
3S3*
3S4*
3S4*
4V14A9
4V14A9
4V14A9
4V14A9
MY
2018
2019
2020
2019
2020
2017
2018
2019
2020
Brand Designation Engine code Gearbox code
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
E
*
*
Documents
Document name
master.xml
Final drive code
*
*
*
*
*
*
*
*
*
Complaint type
functionality ->
activates
functionality ->
irregular
Position
Technical Service Bulletin
Misfiring, W12 TSI - Excessive carbon build up cylinder leakage
Transaction No.: 2049586/4
Release date: May 20, 2019
Condition
Customer statement: Emission control warning signal displayed, engine misfire
Workshop findings: Event entries in engine control unit relating to cylinder misfires – excessive carbon build up to leading to cylinder leakage and
spark plug foul
Technical Background
Deviations in the country-specific fuel specifications can lead to carbon deposits on the injectors. If pronounced these deposits can lead to spark plug
fouling, cylinder leakage and fouled injectors all influencing combustion in the cylinder. As a result the above event entries are logged in the engine
control unit
Production Solution
None
Service
1. Follow DISS best practice, ‘POOR ENGINE RUNNING COMPLAINTS (MISFIRES),’ in order to confirm that the root cause of the misfire is excessive
cylinder carbonisation leading to excessive cylinder leakage/fouling.
2. Raise a DISS query, this action is part of DISS best practice but is an essential element of the investigation
3. Ensure cylinder compressions are tested and recorded, this action is part of DISS best practice but is an essential element of the investigation
4. Ensure cylinder leakage is checked and recorded, this action is part of DISS best practice but is an essential element of the investigation
5. From two of the cylinders that have recorded misfires take borescope images of each inlet valve stem
6. Note: The following operations should only be carried out if excessive carbonisation is confirmed
7. Check and if necessary correct all engine and transmission fluid levels
8. Fill fuel tank
9. Add the relevant dose of Fuel additive (part number G001770A2) to the fuel load as specified on the bottle
10. Run the engine at idle for 8 hours – Periodically check to ensure engine coolant temperature is within safe limits – do not allow engine to
overheat
11. Repeat operations 3 through 5 and compare results if improvement is noted repair is complete
12. If no or little improvement is recorded then the condition of the spark plugs and low pressure injectors will need to be confirmed and replaced
where necessary
13. If this repair procedure is not successful report back via DISS query
14. On successful completion check and if required drain any excess oil from the intercoolers reference TPI 2050222
15. Before returning vehicle to customer top up to fill the fuel tank
Warranty
To carry out the Injector cleaning process (points 8-10)
Warranty type
110 or 910
Labour operation code
24 40 29 00
Damage Service Number
24 40
Damage Code
00 10
Time
20 TU
Required Parts and Tools
Part number
Description
Quantity
G001770A2*
Additive
As required
*Part number correct at time of TPI publication