Throttle - Chamber Deposits
Models: 1993 J30Section: Engine Fuel
Classification: EF&EC 93-002
Bulletin No.: ITB93-062
Date: November 30, 1993
J30 DRIVEABILITY INCIDENTS CAUSED BY THROTTLE CHAMBER DEPOSITS
APPLIED MODEL:
1993 Infiniti J30
SERVICE INFORMATION
Some 1993 J30 vehicles may exhibit the following driveability incidents:
^ Idle speed fluctuation
^ Incorrect idle speed
^ Accelerator pedal difficult to push
^ Difficulty accelerating smoothly from a stop (throttle/vehicle "jumpy")
These symptoms may be the result of throttle chamber deposits. Use the following procedure to check for, clean, and prevent deposits from recurring in the future.
SERVICE PROCEDURE
1) Check for throttle chamber deposits:
Remove the air inlet ducts from the throttle chambers. Open the throttle valve and check for deposits with a light. If deposits are found, remove them with genuine Nissan spray carburetor cleaner (P/N 999MP-A3000).
2) Set the base idle speed:
Using CONSULT (IACV - AAC/V ADJ) in "Work Support" mode (or by disconnecting the AAC valve), check the base idle, and adjust as necessary. See the 1993 J30 Service Manual, pages EF&EC 33-35 for procedure details.
3) Check the engine oil level and correct as necessary.
It is important that the engine oil is not overfilled (above the "H" mark). Maintaining the proper engine oil level (not overfilled) will help prevent recurrence of these incidents.
If the vehicle still exhibits the driveability incidents after following these steps, consult the Service Manual for further assistance.
WARRANTY INFORMATION