Engine - Off-Idle Hesitation or Backfire
89nissan01Classification: Section: Engine Fuel &
EF&E89-001 Emission Control
Reference:
TECHNICAL BULLETIN TS89-005
Models: 1984-87 300ZX, 1985-87 Maxima 1987 200SX (VG30E) Date:
February 6, 1989
VG30E/VG30ET HESITATION, BACKFIRE
APPLIED MODELS: 1984-87 300ZX (Z31) 1985-87 Maxima (U11) 1987 200SX (S12) (VG30E)
SERVICE INFORMATION
An off-idle hesitation or backfire may be caused by intake valve deposits on some of the Applied Models listed above. The intake valve deposits are caused by a combination of fuel quality and driving conditions.
The diagnostic procedure outlined below determines whether or not incident symptoms are the result of intake valve deposits.
SERVICE PROCEDURE
It is important for the Service Writer to obtain the following information (questions 1-5) from the customer so the proper diagnostic method can be used:
1. Was the hesitation experienced during the first few thousand miles?
2. Did the hesitation increase with mileage?
3. Is the hesitation affected by weather (eg. rain, fog, high humidity, etc.)?
4. Does the hesitation always occur? (Is this incident intermittent?)
5. Is the hesitation worse during acceleration from a stop or is it worse when accelerating while cruising?
The following flow chart provides the diagnostic procedure in outline form. Use the appropriate Service Manual to supplement this outline, as it provides the details of inspection and repair procedures for individual models.
WARRANTY INFORMATION
If the diagnostic procedure indicates that carbon blasting is necessary, Nissan, in the interest of customer satisfaction, will pay for the operation on a one time per vehicle basis up to a maximum of 50,000 miles.
To submit a claim for carbon blasting, use the information shown below:
PNC code 13201
CS code 1H
CT code 33
Labor Operation AH90AA
Flat Rate Time Maxima - 3.5
300ZX - 3.6 200SX - 2.9