Tempo L4-140 2.3L HSC (1986)
5.
If condition is still present, replace the EEC IV processor. Refer to the specification charts on pages 18 and 19 of this TSB. Start engine and
run for at least 3 seconds and turn ignition key to the Off position. Inspect ISC motor retracting and repositioning to make sure of proper
operation.
CAUTION: If for any reason the battery is disconnected or the vehicle has to be jump started, this procedure may need to be performed.
a.
Set parking brake and block wheels. If equipped with automatic brake release, disconnect the vacuum hose and plug it. Make all
checks/adjustments with engine at normal operating temperature and accessories Off. Only the TACH is needed for the following procedure.
Before proceeding, check for vacuum leaks.
b.
After transmission is engaged in Drive for ATX or Neutral for MTX, and the engine has idled for 120 seconds, idle RPM should be within
specification.
c.
Lightly step on and off the accelerator. The engine RPM should return to the specification stated in the charts on pages 18 and 19 of this
TSB. If the RPM remains high, repeat the sequence. It may take the system an additional 120 seconds to "learn".
NOTE:
"Learned" and fast idle speeds are controlled by the EEC IV processor and the idle speed control motor. If the control system is operating
properly, these speeds are fixed by the processor and cannot be changed by traditional adjustment techniques (for example, hard stop screw).
OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: Eligible Under Basic Warranty Coverage
OPERATION: SP871907A - Hard stop adjust only
TIME:
1.0 Hr. DLR. CODING: Basic Part No. DRIVE - Code: L5
Processor
Idle Speed
Adaptive/"Learned"
Air
Replaced By
(12A650)
(ISC Motor
Idle Speed
Distribution
Processor
Calibration
Engine
Production
Fully Retracted)
(EEC Controlled)
Plate
(12A650) (3)
1985 MTX
5-25F-R0
(49S) Base
E53Z-HB/HC
640 RPM in Neutral
750 RPM in Neutral
Yes
E63Z-VB
5-25F-R10
(49S) Base
E53Z-HC/HD
640 RPM in Neutral
750 RPM in Neutral
No
E63Z-VB
5-25Q-R0
(Calif) Base
E53Z-GB/GC
640 RPM in Neutral
750 RPM in Neutral
Yes
E63Z-XB
5-25Q-R10
(Calif) Base
E53Z-GC/GD
640 RPM in Neutral
750 RPM in Neutral
No
E63Z-XB
1985 ATX
5-26E-R0
(49S) Base
E53Z-DB/DC
550 RPM in Drive
600 RPM in Drive
Yes
E63Z-TG (1)
5-26E-R10
(49S) Base
E53Z-DC/DD
550 RPM in Drive
600 RPM in Drive
No
E63Z-TG
5-26E-R21
(49S) Base
E53Z-TE/TF
600 RPM in Drive
650 RPM in Drive
No
E63Z-TG
5-26J-R01 (2)
(49S) Base
E53Z-DB/DC
550 RPM in Drive
600 RPM in Drive
Yes
E63Z-TG
5-26J-R11 (2)
(49S) Base
E53Z-DC/DD
550 RPM in Drive
600 RPM in Drive
No
E63Z-TG
5-26R-R01
(Calif) Base
E53Z-EB/EC
550 RPM in Drive
600 RPM in Drive
Yes
E63Z-UG (1)
5-26R-R11
(Calif) Base
E53Z-EC/ED
550 RPM in Drive
600 RPM in Drive
No
E63Z-UG
5-26R-R16
(Calif) Base
E63Z-UE/UF
600 RPM in Drive
650 RPM in Drive
No
E63Z-UG
1985-86 MTX - HIGH OUTPUT (HO)
5-25C-R01
(49S) Plus HO
E53Z-KA/KB650 RPM in Neutral
800 RPM in Neutral
Yes
E53Z-KB
5-25P-R0
(Calif) Plus HO
E53Z-MA/MB650 RPM in Neutral
800 RPM in Neutral
Yes
E53Z-MB
1986 MTX
5-25F-R10
(49S) Base
E53Z-HC/HD
650 RPM in Neutral
750 RPM in Neutral
No
E63Z-VB
6-25F-R10
(49S) Base
E63Z-VB
700 RPM in Neutral
800 RPM in Neutral
No
E63Z-VB (4)