1996 SW1 L4-19L SOHC VIN 8 Engine Troubleshooting: Rough Idle, Surging, Stalling
Technical Service Bulletin # 96-T-32A
Date: 970401
Engine - Runs Rough, Surges at Idle, Stalls After Start
BULLETIN NO.: 96-T-32A
ISSUE DATE: April, 1997
GROUP/SEQ. NO.: Engine-09
CORPORATION NO.: 686506R
SUBJECT:
Engine Runs Rough, Surges at Idle, Stalls after Start and/or MIL On and PCM/EC DTC 45 (1995 Vehicles) or DTC P0172 (1996 Vehicles) (Replace
O2S Wire)
This bulletin is being revised to add a part number for the replacement wire and supercedes bulletin 96-T-32, which should be discarded. Revisions are
shown by asterisks.
MODELS AFFECTED:
1995 Saturns built between and including VINs SZ352000 and SZ403344, and 1996 Saturns built between VINs TZ100181 and TZ143882.
CONDITION:
Engine may run rough or surge at idle, or the engine may start then stall. In some cases, the malfunction indicator lamp (MIL) (SERVICE ENGINE
SOON telltale lamp) may be On with PCM/EC diagnostic trouble code (DTC) 45 (1995 vehicles) or DTC P0172 (1996 vehicles) stored in memory.
DTC 45 (Rich Oxygen Sensor Signal) or DTC P0172 (Learned Fuel Control Fuel System Too Rich) indicates that the oxygen sensor is sensing a rich
fuel condition.
The conditions stated above may occur when:
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Driving through precipitation containing road salts.
^
Driving through standing water containing road salts.
^
Driving through precipitation after the vehicle has been subjected to road salts.
^
During or after a car wash.
CAUSE:
The oxygen sensor (Purple) wire for circuit 412 may have perforations in the insulation causing intermittent malfunction of the oxygen sensor signal.
These perforations are only visible with magnification.
CORRECTION:
Refer to Procedures in this bulletin to diagnose this condition.
PROCEDURES
Diagnosis
