Engine - High or Erratic Engine Idle
86ford07Article No. 86-19-12
IDLE - ERRATIC - 2.3L HSC CFI
IDLE - HIGH 2.3L HSC CFI
FORD 1985-86 TEMPO
LINCOLN-MERCURY 1985-86 TOPAZ
High or erratic engine idle speeds may be caused by "electrical noise" entering the EEC IV processor at the Power Steering Pressure Switch (PSPS) and Self-Test Input (STI) Signal Lines. This may be corrected by checking the condition following the diagnostic/repair procedure below and installing the 1986 processor per the application chart.
Service Procedure
1. Evaluate the vehicle for customer concern. If idle speeds are erratic or high, proceed to the diagnostic procedures on pages 25 and 26 and repair as indicated. Continue with Step 2 of this procedure after the diagnostics have been completed.
2. Idle the vehicle for two minutes with the engine at full operating temperature with the transmission in gear for ATX or in Neutral for MTX. Parking brake and service brake applied! This is to reset the adaptive idle speed control. (Learning is for processor replacement.)
3. Reset the throttle body hard stop to 625 RPM in Drive for ATX, and 720 RPM in Neutral for MTX.
NOTE: ISC must be fully retracted and electrically unplugged to adjust hard stop speed.
4. Adjust TV rod to specifications, ATX only.
5. Idle the vehicle for two minutes with the engine at full operating temperature with the transmission in gear for ATX or in Neutral for MTX. Parking brake and service brake applied! This is to reset the adaptive idle speed control. (Learning is for adjustments made.)
6. Perform the EEC IV Quick Test to ensure the system is operating properly.
NOTE: If any codes are received from the 1986 level processor, the 1986 Diagnostics must be used in Volume H.
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 clear plastic decal shield.
PART NUMBER PART NAME CLASS
E63Z-12A650-TG Processor*# R
E63Z-12A650-UG Processor*# W
E63Z-12A650-VB Processor* R
E63Z-12A650-XB Processor* W
* Refer to chart on page 24 for proper application.
# Replace vacuum retard delay valve with E3AZ-12A208-E for the
air cleaner Duct and Valve Assembly. This is a Class B part. This applies to the following calibrations ONLY:
526E-R0 526E-R10 526R-R0 526R-R10
OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual.
OPERATION: SP1265OG86
TIME: 2.2 Hrs. DLR. CODING: Basic Part No. 12A650 - Code: N5
CALIBRATION APPLICATION CHART
Processor Hard Stop Adaptive/"Learned"
Calibration Engine (12A650) R/B Idle Speed Idle Speed
1985 MTX
5-25F-R0 (49S) Base E53Z-HB/HC E63Z-VB 640 RPM in Neutral 750 RPM in Neutral
5-25F-R10 (49S) Base E53Z-HC/HD E63Z-VB 640 RPM in Neutral 750 RPM in Neutral
5-25Q-R0 (Calif) Base E53Z-GB/GC E63Z-XB 640 RPM in Neutral 750 RPM in Neutral
5-25Q-R10 (Calif) Base E53Z-GC/GD E63Z-XB 640 RPM in Neutral 750 RPM in Neutral
5-25C-R01 (49S) Plus (HO) E53Z-KA/KB 640 RPM in Neutral 800 RPM in Neutral
5-25P-R0 (Calif) Plus (HO) E53Z-MA/MB 640 RPM in Neutral 80O RPM in Neutral
1985 ATX
5-26E-R0 (49S) Base E53Z-DB/DC E63Z-TG 590 RPM in Drive 600 RPM in Drive
5-26E-R10 (49S) Base E53Z-DC/DD E63Z-TG 590 RPM in Drive 600 RPM in Drive
5-26E-R21 (49S) Base E63Z-TE/TF E63Z-TG 625 RPM in Drive 656 RPM in Drive
5-26J-R01 (49S) Base E53Z-DB/DC E63Z-TG 590 RPM in Drive 600 RPM in Drive
5-26J-R11 (49S) Base E53Z-DC/DD E63Z-TG 590 RPM in Drive 600 RPM in Drive
5-26R-R01 (Calif) Base E53Z-EB/EC E63Z-UG 590 RPM in Drive 600 RPM in Drive
5-26R-R11 (Calif) Base E53Z-EC/ED E63Z-UG 590 RPM in Drive 600 RPM in Drive
5-26R-R16 (Calif) Base E63Z-UE/UF E63Z-UG 625 RPM in Drive 656 RPM in Drive
1986 MTX
5-25F-R10 (49S) Base E53Z-HC/HD E63Z-VB 640 RPM in Neutral 750 RPM in Neutral
6-25F-R10 (49S) Base E63Z-VB 720 RPM in Neutral 800 RPM in Neutral
5-25Q-R10 (Calif) Base E53Z-GC/GD E63Z-XB 640 RPM in Neutral 750 RPM in Neutral
6-25Q-R10 (Calif) Base E63Z-XB 720 RPM in Neutral 800 RPM in Neutral
5-25C-R01 (49S) Plus (HO) E53Z-KA/KB 640 RPM in Neutral 800 RPM in Neutral
5-25P-R0 (Calif) Plus (HO) E53Z-MA/MB 640 RPM in Neutral 800 RPM in Neutral
1986 ATX
6-26E-R0 (49S) Base E63Z-TF E63Z-TG 625 RPM in Drive 656 RPM in Drive
6-26E-R10 (49S) Base E63Z-TG 625 RPM in Drive 688 RPM in Drive
6-26R-R10 (Calif) Base E63Z-UF E63Z-UG 625 RPM in Drive 656 RPM in Drive
6-26R-R11 (Calif) Base E63Z-UG 625 RPM in Drive 688 RPM Drive
* Fuel Economy Package without A/C
Page 25
Erratic or High Pinpoint
1
Idle Speeds Test
TEST STEP RESULT ACTION TO TAKE
1 SERVICE CODE CHECK
^ Run the EEC-IV Self-Test as outlined in Code 11 Go to Step 2. Volume H of the Car/Truck Shop
Manual. Other error codes Diagnose/repair per
Volume H then go to Step 2.
2 TPS CHECK
^ Install Breakout Box. Voltage between ^ TPS voltage OK.
.85-.95V Go to Step 3.
^ Engine at operating temperature.
^ Engine running at idle. Voltage less than ^ TPS out of range.
.85V or greater ^ Repair as
^ Monitor TPS voltage with DVOM, Pin 46 than .95V necessary. to Pin 47. ^ Recheck for
concern.
3 ITS CHECK
^ Engine running at idle. 12V DC at idle ^ ITS OK.
1.0V or less with Go to Step 4.
^ Monitor ITS voltage with a DVOM throttle open. Pin 28 to Pin 40.
^ Measure voltage at idle. Either voltage ^ Check ITS wiring/ out of range. connector.
^ Move throttle to open ITS circuit. ^ If wiring/connector
OK, replace ISC/ITS motor.
Other possible causes:
^ Sticking throttle cable/throttle shaft.
^ Bad TV linkage return spring.
^ Bent throttle tang.
Page 26
Erratic or High Pinpoint
1
Idle Speeds Test
TEST STEP RESULT ACTION TO TAKE
4 DISTRIBUTOR CAP AND ROTOR
^ Verify that distributor is equipped Yes ^ Replace the with the vented cap. processor per the
application chart. Then continue with Step 2 of service procedure.
^ Verify the rotor is a single blade No ^ Refer to TSB type. 85-22-17.
^ Insure that the blade has a thin ^ Recheck for coating of dielectric grease. concern.