Engine - Runs Rough/Multiple Misfire DTC's Set/MIL ON
L-SB-0029-10May 12, 2010
MIL "ON" DTC P030 # and/or Intermittently Runs Rough
Service Category
Engine/Hybrid System
Section
Engine Control
Market
USA
Applicability
Introduction
Some 2006 - 2010 model year IS 250 vehicles may exhibit one or more of the following conditions:
^ MIL "ON" DTC P0300, P0301 P0302, P0303, P0304, P0305, and/or P0306.
^ Runs rough after coming to a stop with the engine at operating temperature.
^ Runs rough with engine misfires present after a cold soak startup. Follow the procedures in this bulletin to address these conditions.
Production Change Information
This TSIB applies to vehicles produced BEFORE the Production Change Effective VINs shown.
Warranty Information
APPLICABLE WARRANTY
^ This repair is covered under the Lexus Powertrain Warranty. This warranty is in effect for 72 months or 70,000 miles, whichever occurs first, from the vehicle's in-service date.
^ Warranty application is limited to occurrence of the specified condition described in this bulletin.
Parts Information
Required Tools & Equipment
Inspection Procedure
1. Confirm that the condition is applicable per the Introduction.
2. Perform misfire diagnosis.
Refer to the Technical Information System (TIS) applicable model year IS 250 Repair Manual:
^ 2006 / 2007 / 2008 / 2009 / 2010 IS 250:
Engine/Hybrid System - Engine control - "4GR-FSE Engine Control System: SFI System:
P0300-P0306: Random / Multiple Cylinder Misfire Detected"
NOTE
Normal mechanical engine condition, engine control system, fuel supply/injection systems, and ignition system operation must be present or this TSIB does NOT apply.
3. If the concern is NOT resolved after following the Repair Manual misfire diagnosis proceed with the repair procedure below.
Repair Procedure
HINT
For 2006 model year repair tips and specifications regarding assembly and disassembly, refer to TSIB No. L-SB-0088-08, "M.I.L. 'ON' DTC P0300, P0301, P0302, P0303, P0304, P0305, or P0306".
NOTE
Each step must be carefully followed - Deviating from this procedure will compromise overall effectiveness.
1. Run the engine and bring to operating temperature.
2. Remove the intake air surge tank assembly.
3. Remove all ignition coils and spark plugs.
4. Remove the starter relay.
5. Using a funnel as necessary pour 1.0 oz of GM Upper Engine and Fuel Injector Cleaner (GM P/N 88861802) into each of the 6 cylinders via the spark plug holes.
6. Place and secure shop towels over all the spark plug tubes.
7. Crank the engine for 5 seconds using a jumper wire at the starter relay terminals 3 and 5.
NOTE
Cranking will assure even dispersal of top engine cleaner on the piston domes.
8. Let the engine soak for 60 minutes.
9. Spray a generic lubricant into each bore.
10. Rotate the crank pulley clockwise 2 rotations by hand to disperse the bore lubricate.
11. Crank the engine 5 seconds to redistribute the top engine cleaner.
12. Allow 1 additional hour of soak time prior to starting the engine; proceed with reassembly during the remainder of the soak period.
13. Remove any remaining top engine clean from the combustion chamber and spark plug tubes.
14. Reinstall the spark plugs and ignition coils.
15. Reinstall the intake air surge tank assembly.
16. Drain and refill the engine oil.
17. Start the engine and immediately test drive the vehicle for 15 minutes minimum.
During the test drive, it is recommended to use lower gears and moderate throttle to operate the engine at an increased RPM. It is normal for smoke to be emitted from the exhaust during the first few minutes of operation.
18. Change the engine oil and oil filter.
19. Using TIS Techstream clear any DTCs that may have set.
20. Confirm normal vehicle operation.