Sentra L4-1597cc 1.6L DOHC MFI (GA16DE) (1991)
Air Flow Meter/Sensor: Customer Interest
Engine - Spark Knock
Classification:
EF & EC94-007a
Section:
Engine Control System
Reference:
Technical Bulletin NTB94056a
Models:
1991-94 Sentra (B13)
Date:
February 22, 1995
1991-94 SENTRA GAl6DE SPARK KNOCK
This Bulletin contains amended service information, please discard the original.
APPLIED DATE 9/90 thru 4/94
SERVICE INFORMATION
If a Sentra customer complains of spark knock or pinging noises during high ambient temperatures, perform the following to diagnose this incident:
1. Check the ignition timing. Set the initial timing to 8° BTDC (specification 10° + 2° BTDC). Test drive vehicle.
2. If spark knock persists, change fuel to a name brand, higher octane (premium unleaded). Test drive vehicle.
3. If spark knock still persists, remove the spark plugs and inspect the piston tops for excessive carbon deposits. Removal of carbon deposits should
only be performed with an approved technique. Call Nissan TECHLINE for details.
4. If very high ambient temperature (greater than 100°F) and low humidity (less than 40% conditions are present*, and the above techniques do not
reduce the spark knock to an acceptable level, replace the air flow meter with the part number shown below.
* If spark knock occurs outside these conditions, consult the Nissan TECHLINE for further assistance.
Parts Information
Warranty Information