Engine - Cold Engagement/Deceleration Stall
Article85-9-26
05/03/85
STALLS - ENGAGEMENT/DECEL AFTER INITIAL COLD START - 2.3L HSC CFI
FORD:
1985 TEMPO
LINCOLN-MERCURY:
1985 TOPAZ
Engagement or decel stalls occuring on some vehicles after the first initial cold start, may be caused by the basic vacuum system or EEC IV system malfunction. In order to diagnose which system is causing the stall concern, the following procedure should be performed.
1. Check and adjust ignition timing - See Figure 27.
NOTE:
Timing symbol values for 1985 ATX vehicles are different than 1984 ATX vehicles. See Figure 27.
2. Check for engine vacuum leaks.
3. Perform the EEC IV Quick Test (see 1985 Shop Manual, Volume H) and service any codes as required.
NOTE:
If service code 22 is found in the continuous test (memory) portion of the key-on, engine-off self-test, it may be an erroneous code generated by the processor. If code 22 is received in memory, follow TSB 85-2-6 and then proceed.
4. Check for EEC wiring/connector concerns by performing a "Wiggle Test" on the following sensors using the corresponding pinpoint test.
SENSOR INPUT PINPOINT
EGR Valve Position (EVP) DD90
Engine Coolant Temperature (ECT) DE90
Air Charge Temperature (ACT) DB90
NOTE:
While performing the ACT sensor "Wiggle Test", check the routing of the EEC Harness Wiring to the sensor. If harness is routed too taut, the connector could pull loose creating an intermittent or open circuit.
Processor Application Calibration Updated
Vehicle Processor Replace with From To
E53F-12A650-HB E53Z-12A650-HC 5-25-R0 5-25F-R10
E53F-12A650-GB E53Z-12A650-GC 5-250-R0 5-25Q-R10
E53F-12A650-DB E53Z-12A650-DC 5-26E-R0 5-26E-R10
E53F-12A650-DB E53Z-12A650-DC 5-26J-R01 5-26J-R11
E53F-12A650-EB E53Z-12A650-EC 5-26R-R01 5-26R-R11
Obtain an Authorized Modifications decal and list the date, dealer number and summary of alterations performed. Select a prominent place adjacent to the Vehicle Emission Control Information decal suitable for installing the authorized Modifications decal. Clean the area, install the decal and cover it with a plastic decal shield.
PART NUMBER PART NAME CLASS
E53Z-12A650-HC Processor R
E53Z-12A650-GC Processor W
E53Z-12A650-DC Processor R
E53Z-12A650-EC Processor W
E43Z-9F479-B Map Sensor A
OTHER APPLICABLE ARTICLES:
None
WARRANTY STATUS:
Reimbursable within the provisions of the warranty and Policy Manual.
OPERATION:
SP1265OB85
TIME:
2.1 Hrs.
SUPPLEMENTAL OPERATIONS TIME
SP12650B1 - Check processor (TSB 85-2-6) 0.5
SP1265OB2 - Repair electrical fault 0.3
SP12650B3 - Replace MAP sensor 0.3
SP12650B4 - Remove distribution plate 0.5
SP12650B5 - Reset throttle stop screw 0.6
SP12650B6 - Check throttle linkage 0.1
SP12650B7 - Replace processor 0.5
DLR. CODING:
Basic Part No.
DRIVE - Code: J8