January 1973 - December 1973

Bulletin No. 30A - February 2, 1973

(9 articles)

1973 COLD START AND DRIVEABILITY IMPROVEMENTS
  • Article 274-S1 - (460 CID) - Leanness, surge, and other driveability-oriented conditions
  • Article 274-S2 - (302 CID F100) - Cold starting condition
  • Article 274-S3 - (302 CID F100) - Cold starting, leanness or surging
  • Article 244-S4 - (429 CID) - Leanness or surge
  • Article 244-S5 - (360 CID - 4650 GVW and under) - Cold starting (Low volume application)
  • Article 244-S6 - (360 CID - 4800 GVW and over) - Cold starting (Low volume application)
  • Article 244-S7 - (250 CID) - Leanness, surge and other driveability conditions
  • Article 244-S8 - (351W CID) - Cold starting, leanness or surge driveability conditions
  • Article 244-S9 - (351W CID) - Cold start and driveaway

POWERTRAIN

INTRODUCTION

The service procedures contained in this bulletin are now authorized for dealer usage to improve cold starting and for driveability on specified 1973 model engine calibrations.

This is the second issue updating the 1973 Cold Start and Driveability Improvements, as outlined in Technical Service Bulletin No. 30 dated November 24, 1972. In order to provide service technicians with a quick refernce for approved corrections, these Bulletins will continue to be published in alphabetical sequence, (e.g., Technical Bulletin No. 30B, 30C, etc.).

UNDER THE FOLLOWING PROCEDURES DEALERS MAY PERFORM CERTAIN CHECKS AND ADJUSTMENTS TO CORRECT SPECIFIC DRIVEABILITY CONDITIONS. BECAUSE OF THE EFFECT OF BASIC ENGINE SETTINGS ON COLD START AND DRIVEABILITY, IT WILL BE NECESSARY TO PERFORM BASIC ENGINE CHECKS AND ADJUSTMENTS PRIOR TO THE INSTALLATION OF AN "EMISSION CALIBRATION KIT".

Perform the following basic engine checks and adjustments:

    1. Check the vacuum line routing and connections
    2. Check and adjust fast idle, idle mixture and curb idle
    3. Check and adjust timing, dwell and check operation of distributor vacuum advance
    4. Check for proper operation of EGR valve.

The warranty time allowance of 0.4 hours for performing the preceding basic engine checks and adjustments, applies only to the first customer visit between 500 and 3,000 miles. Customers should be advised that waiting until the engine has 500 miles of operation before performing adjustments will result in more acceptable engine operation.

WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual
OPERATION: SP-9475-A-73
TIME: 0.4 Hr.
DLR. CODING: BASIC PART NO. "DRIVE" - Code 07

It is anticipated that performing the basic engine checks and adjustments will correct most cold starting and driveability difficulties. If additional improvement is required to achieve customer satisfaction, one of the "Emission Calibration Kits" listed may be installed for specific complaints. Each kit will provide improvement for only those symptoms identified in te description below. Therefore, kit installation for symptoms other than those identified will be ineffective and may result in customer dissatisfaction.

Due to the subject parts being in critical supply, dealer's orders should be based on immediate requirements. Where large quantity orders are received, it may be necessary to reduce these orders to guarantee a limited fill to all dealers. If this occurs, dealers must re-order.

The following chart shows all of the Emission Calibration Kits available to date. The applicability of these kits must be restricted to those shown on the chart; any other use of these kits is unauthorized and illegal.

NOTE:
    Emission Calibration Service Kit D3AZ-6E017-C (updating the 1973-302 CID Engine from the 3-10A, R-6 level to the 3-10A, R-10 level), is no longer available for service. This was a low production volume application, and all vehicles in service should be updated to the R-10 level at this time.


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RELATED LINKS

RELATED LINKS:

Bulletin No. 30 - November 24, 1972
(3 articles)
1973 COLD START AND DRIVEABILITY IMPROVEMENTS


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