Medallion L4-2165cc 2.2L (1988)
Oxygen Sensor: Technical Service Bulletins
Engine - Rough Idle/Uneven Acceleration/No Code
3E
DECEMBER 1987 442
1988 MEDALLION MODELS WITH MANUAL TRANSMISSION
ENGINES
Attention: Workshop, Parts Department
ENGINE DIAGNOSIS
On some 1988 Medallion models with manual transmission, the MS 1700 tester may not indicate a system fault if occasional rough idle/uneven
acceleration is experienced with a warm engine.
This condition may be the result of a calibration difference between the oxygen sensor and ECU. Because the difference is so slight, it will not register
on the MS 1700 tester.
If the tester does not indicate a system fault and the warm engine condition is experienced, install oxygen sensor module kit, P/N 8983 505 116, as
outlined in this I.S. Note.
Figure 1
The kit contains the following components (Fig. 1):
^
oxygen sensor-voltage limiting module (A)
^
ground wire (B) sensor connectors (C) and (D)
^
voltage source wire (E) for the MAP sensor voltage input wire
FIGURE 2
KIT INSTALLATION PROCEDURE
1.
Open the hood.
2.
Disconnect the battery cables.
3.
Remove the battery holddown bracket.
