23-EM-007H

GROUP
NUMBER
ENGINE
Technical Service Bulletin
SUBJECT:
23-EM-007H
DATE
MODEL
DECEMBER 2023
Multiple Models
COMBUSTION CHAMBER CLEANING PROCEDURE
Description:
This bulletin provides the service procedure for Combustion Chamber Cleaning.
APPLICABLE VEHICLES: All Models & All MY equipped with 4-Cylinder Gasoline Engines
Parts Information:
Special Service Tools and Cleaning Fluid Supplies
PART NAME
PART NUMBER / DESCRIPTION
CLEANING
FLUID
00232-19115
Engine Combustion
Chamber Cleaner
ECF-1
00232-19109
HK Technology Engine
Cleaning Fluid
CLEANING
KIT
NOTES
** Use either product **
P/N 00232-19115
(4 bottles per order)
Use (1) 800cc bottle of KD
Engine Combustion Chamber
Cleaner ECF-1 per vehicle
or
P/N 00232-19109
(12 x 100cc bottles per order)
Use (8) 100cc bottles of HK
Technology Engine Cleaning
Fluid per vehicle
CLEANING KIT Set
(All components)
KQ234-C6100FFF
CLEANING
KIT
(Individual
components)
EVACUATION
TOOL
(Air-powered)
KQ234-C6101FFF
Adaptor 4EA
KQ234-C6102FFF
Hose 2EA
KQ234-C6103FFF
Syringe & Hose 2EA
KQ234-C6104FFF
Pressurization Adaptor 1EA
KQ234-C6105FFF
KIT case 1EA
Commercially
Available
To be used to apply vacuum to
the crankcase during the presoak steps and to evacuate the
cleaning fluid afterwards.
Circulate To: Service Manager, Warranty Manager, Service Advisors, Technicians, Fleet Repair
SUBJECT:
COMBUSTION CHAMBER CLEANING PROCEDURE
Service Procedure Overview:
TSB #: 23-EM-007H
Page 2 of 9
SUBJECT:
COMBUSTION CHAMBER CLEANING PROCEDURE
Service Procedure:
(Refer to the QR link for additional video information )
STUI
This TSB includes Repair validation photos.
Refer to the latest Digital Documentation Policy for requirements.
NOTICE
The procedure outlined in this TSB does not apply if the engine is exhibiting abnormal noise
or showing signs of internal damage. Diagnose the existing condition and repair accordingly.
 Perform combustion chamber cleaning under warranty after PA approval as instructed per TSB
23-EM-008H “Engine Oil Consumption Inspection and Repair Guidelines”.
 This procedure can also be performed at every 24,000 miles under customer pay as part of a
routine maintenance schedule for continued engine cleanliness.
1.
Start the engine and allow it to idle until it reaches
normal operating temperature, then turn engine off.
NOTICE
To improve cleaning effectiveness, the
remaining part of the service procedure must
be performed while the engine is still hot.
2.
Remove the *INJECTOR and IGN COIL fuses.
(Exact location may vary depending on the model.)
*NOTE: On some models without a separate
injector fuse, remove the FUEL PUMP fuse.
3.
Disconnect and remove all ignition coils from the
spark plug tubes, then use an air blow gun to clear
out any debris from the valve cover tops and inside
each spark plug tubes (before spark plug removal).
NOTICE
Failure to clear off debris can contaminate the
cylinder during the cleaning procedure.
Certain engine types may require additional
parts to be removed to access the ignition coils
and spark plugs of some cylinders. Refer to
applicable Shop Manual.
4.
Remove all spark plugs.
 Inspect spark plugs for carbon fouling, and clean as necessary (soak the tips in cleaner).
 Refer to the maintenance schedule if replacement of spark plugs may be necessary.
TSB #: 23-EM-007H
Page 3 of 9
SUBJECT:
5.
COMBUSTION CHAMBER CLEANING PROCEDURE
*** PRE-SOAK #1 ***
Position the crankshaft so that all pistons are
midway between top and bottom of the cylinders.
NOTE: Set TDC for Cylinder #1, then rotate the
crankshaft 90° (use the crank rotator tool KQ2312T102QQH and rotate clockwise “5 ratchet clicks”)
to place all pistons at the moderate position.
6.
Inject (or pour) 50cc of the cleaning fluid into each
cylinder through the spark plug hole.
Inject or pour
50cc of
cleaning fluid
to each
cylinder.
(Overview of typical crankcase vacuum connection point to the PCV system)
7.
Apply vacuum to the crankcase through the PCV
fresh air breather hose by using an air-powered
evacuation tool or an air bleed tool.
PCV System Breather Hose:
Disconnect from intake hose
and connect to vacuum tool
 Vacuum Force: 8~12 inHg (-4 to -6 PSI)
 Time: 5 minutes
Apply vacuum to
crankcase for 5
minutes.
TSB #: 23-EM-007H
Page 4 of 9
SUBJECT:
COMBUSTION CHAMBER CLEANING PROCEDURE
NOTE: Confirm crankcase vacuum is being
applied after a few seconds by briefly pulling the
dipstick from the dipstick tube and listen for the air
rush noise.
“PHEW”
 If no air rush noise is heard and vacuum is
not felt at the dipstick tube, check the
vacuum tool and air connection to the
crankcase so that vacuum is applied.
 A leaking one-way check valve of the PCV
can also cause loss of crankcase vacuum
with tool. Block the PCV Valve (or pinch the
hose connected to the valve) to stop air
escaping and resume vacuum. Inspect and
replace the PCV Valve at Step 25 if the
internal one-way check valve is not sealing.
PCV Valve
NEW
OLD
(STUCK)
 Reinsert the dipstick after checking.
8.
9.
*** AGITATION ***
Connect the adaptor (KQ234-C6101FFF) & hose
(KQ234-C6102FFF) to each companion cylinder
as shown on the right.
 Connect the #1 and #3 cylinders together.
 Connect the #2 and #4 cylinders together.
Connect battery to a charger to assist cranking power.
Operate the starter (3 seconds / 8 times) to crank
the engine for creating agitation to distribute the
cleaning fluid within the combustion chambers.
 Cleaning fluid will circulate between the hoses.
 Disconnect the adapter and hoses afterwards.
10. Position the crankshaft so that all pistons are
midway between top and bottom of the cylinders.
11. Inject (or pour) 50cc of the cleaning fluid into each
cylinder through the spark plug hole.
Inject or pour 50cc of cleaning fluid to each cylinder.
*** Hot Soak #1 ***
12. Close the hood and allow the engine heat to soak
the cleaning fluid for at least 2 hours.
!
CAUTION
Never turn the engine ‘ON’ until the cleaning
procedure has been fully completed.
TSB #: 23-EM-007H
Page 5 of 9
COMBUSTION CHAMBER CLEANING PROCEDURE
SUBJECT:
*** Post Soak #1 Clearing ***
13. Apply vacuum to the crankcase through the fresh
air vent hose of the PCV by using an air-powered
evacuation tool or an air bleed tool.
Apply vacuum to crankcase
for 5 minutes.
 Vacuum Force: 8~12 inHg (-4 to -6 PSI)
 Time: 5 minutes
14. Crank the engine (3 seconds / 8 times).
!
CAUTION
Residual cleaning fluid may escape out of the
spark plug holes during the cranking process.
• To prevent any fluid splatter, use shop
towels to cover the spark plug tubes, then
hold it down with a suitable long heavy
tool when cranking.
15. Position the crankshaft so that all pistons are
midway between top and bottom of the cylinders.
*** PRE-SOAK #2 ***
16. Inject (or pour) 50cc of the cleaning fluid into each
cylinder through the spark plug hole.
17. Apply vacuum to the crankcase through the fresh
air vent hose of the PCV by using an air-powered
evacuation tool or an air bleed tool.
Inject or pour 50cc of cleaning fluid to each cylinder.
Apply vacuum to crankcase
for 5 minutes.
 Vacuum Force: 8~12 inHg (-4 to -6 PSI)
 Time: 5 minutes
18. Inject (or pour) 50cc of the cleaning fluid into each
cylinder through the spark plug hole.
Inject or pour 50cc of cleaning fluid to each cylinder.
*** Hot Soak #2 ***
19. Close the hood and allow the engine heat to final
soak the cleaning fluid for at least 2 hours.
!
CAUTION
Never turn the engine ‘ON’ until the cleaning
procedure has been fully completed.
TSB #: 23-EM-007H
Page 6 of 9
COMBUSTION CHAMBER CLEANING PROCEDURE
SUBJECT:
20.
After the final hot soak, record borescope image of
the cylinder #2 combustion chamber/piston top
using the GDS tablet for uploading to STUI.
STUI
Take a screenshot of the #2 piston top
borescope image using your particular
tablet’s screenshot save method and
upload to STUI.
*** Post Soak #2 Clearing ***
21. Apply vacuum to the crankcase through the fresh
air vent hose of the PCV by using an air-powered
evacuation tool or an air bleed tool.
Apply vacuum to crankcase
for 5 minutes.
 Vacuum Force: 8~12 inHg (-4 to -6 PSI)
 Time: 5 minutes
22. Crank the engine (3 seconds / 8 times).
!
CAUTION
Residual cleaning fluid may escape out of the
spark plug holes during the cranking process.
• To prevent any fluid splatter, use shop
towels to cover the spark plug tubes, then
hold it down with a suitable long heavy
tool when cranking.
23. Remove all of the remaining cleaning fluid from the
combustion chamber using the air-powered
evacuation tool.
24. Reinstall all removed fuses, spark plugs, ignition
coils, and any other removed components
NOTICE
Be sure to secure the lock tabs of each
ignition coil connector.
PCV Valve
NEW
OLD
(STUCK)
25. If vehicle is confirmed to have stuck PCV check
valve (air escaping to intake manifold when
crankcase vacuum is applied with tool), remove
the PCV Valve to inspect and replace if necessary.
 Inspect PCV check valve for partial clogging.
 Inspect PCV one-way check valve operation.
TSB #: 23-EM-007H
Page 7 of 9
SUBJECT:
COMBUSTION CHAMBER CLEANING PROCEDURE
*** Engine Oil / Filter Change ***
26. Change the engine oil with a new engine oil filter according to the vehicle shop manual.
NOTICE
Oil change must be performed to remove the washed
contaminants from the crankcase. Recommended engine
oil specification is 5W-30 Full Synthetic Type with a Service
Grade of API SN PLUS/SP, ILSAC GF4/GF5 or higher.
 FULLY DRAIN THE OIL
 REPLACE OIL FILTER
 ADD NEW ENGINE OIL
 ADJUST TO “FULL”
*** Engine Rev Final Clearing Procedure ***
27. Start the engine and maintain part throttle until engine idles smoothly, then idle for 3 minutes.
 Move vehicle to an outdoor area just after initial engine start to idle, whenever possible.
28. Drive in Manual Mode to hold low gear to maintain target engine speed of 2,500 ~ 4,000 RPMs.
Continue to drive with the raised engine RPM for about 5 minutes to increase engine temp.
29. Apply Heavy Throttle Input from low gear for the engine speed to reach nearly 6,000 RPMs,
and allow the ATM to automatically shift to next gear (if equipped w/MT: shift before redline).

 Repeat this step at least 4 ~ 6 times until no visible burn off smoke is seen from the tailpipe.
30. After the test drive in PARK, briefly apply heavy throttle input to raise the engine speed from
approximately 2,000 RPMs to 5,000 RPMs to help further clear the combustion chambers.

 Repeat this step at least 4 ~ 6 times until no visible carbon is seen exiting the tailpipe.
TSB #: 23-EM-007H
Page 8 of 9
SUBJECT:
COMBUSTION CHAMBER CLEANING PROCEDURE
*** Vehicle Return Preparation ***
31. Perform an All Systems Fault Code search and clear any incident DTCs.
 Reset engine Adaptive Values after DTC checking/clearing.
32. Confirm that the engine oil level is at the “F” line on the dipstick.
NOTICE
Adjust the engine oil level exactly to the “F” line of the dipstick.
Recommended engine oil specification is 5W-30 Full Synthetic Type with a Service Grade of
API SN PLUS/SP, ILSAC GF4/GF5 or higher.
33. Check that all removed engine cover and miscellaneous components have been reinstalled.
34. Schedule vehicle for next inspection or service return.
 If combustion chamber cleaning was performed due to an oil consumption concern,
then refer back to TSB 23-EM-008H “Engine Oil Consumption Inspection and Repair
Guidelines” for the additional finalization steps.
 If combustion chamber cleaning was performed as a maintenance service under
customer pay, then the service advisor should review with the customer regarding the
appropriate oil change interval per their driving habits and schedule a next appointment.
NOTICE
Refer to TSB 23-FL-003H (or latest) for important information regarding:
• Hyundai Fuel System Cleaner Plus – fuel tank additive
• Top Tier Gas Usage – high quality gasoline with detergents
• Engine Oil / Filter Change Service Interval Information for Mixed-Mode driving conditions
TSB #: 23-EM-007H
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