Technical product information
Topic
Market area
Brand
Transaction No.
Level
Status
Release date

Misfiring, W12 TSI - Excessive carbon build up cylinder leakage
Bentley: worldwide (2WBE)
Bentley
2049586/6
EH
Released for publishing
03-Jul-2020

New customer code
Object of complaint

Complaint type

information, navigation, communication, entertainment -> symbolic fault indicators -> emission control fault
indicator
engine -> engine operation -> power development -> engine power

functionality ->
activates
functionality -> uneven

Vehicle data
W12 Bentayga - New Continental GT - New Continental GTC
Sales types
Type

MY Brand Designation Engine code Gearbox code Final drive code

3S3*
3S3*
3S3*
3S4*
3S4*
4V14A9
4V14A9
4V14A9
4V14A9
4V14A9

2018
2019
2020
2019
2020
2017
2018
2019
2020
2021

E
E
E
E
E
E
E
E
E
E

Documents
Document name
master.xml

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Position

Technical product information
Misfiring, W12 TSI - Excessive carbon build up cylinder leakage

Transaction No.: 2049586/6
Release date: 03-Jul-2020

Customer statement / workshop findings
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 change
None

Measure
1. Follow the Misfire best practice TPI 2051187 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 with your findings, this action is an essential element of the investigation
3. Ensure cylinder compressions are tested and recorded, this action is an essential element of the investigation
4. Ensure cylinder leakage is checked and recorded, this action 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 G17 Fuel additive to the fuel load as specified on the bottle (refer to ETKA)
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 accounting instructions
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

Refer to ElsaPro for all other labour operation times

Parts information
Part number

Description

Refer to ETKA Additive

Quantity
As required