Engine Controls - Warm Deceleration Stall At Idle/DTC 35

9234oldsmobile01

NUMBER: 92-T-106

CORP.REF.NO: 276108

DATE: July 1992

SECTION: 6E, 8A


SUBJECT:
WARM ENGINE DECELERATION STALL
AT IDLE AND/OR TROUBLE CODE 35
- INSPECT IDLE AIR CONTROL WIRE HARNESS

MODELS/YEARS:
1992 ACHIEVA


CONDITION:
Warm engine deceleration stall at idle and/or diagnostic trouble code 35.

CAUSE:
Wire harness to the Idle Air Control (IAC) may contact throttle cable bracket allowing the wire insulation to wear through.

CORRECTION:
The wire harness in vehicles built after vehicle number NM451285, has been routed over the power brake vacuum pipe and the condition described above is not likely to occur on these vehicles.





On vehicles built prior to vehicle number NM451285, repair any damaged wires, tape area, and reroute harness over the power brake booster vacuum pipe using the procedure below. See the illustration.
1. Disconnect IAC connector and inspect wire harness for worn insulation.
2. If insulation is worn, repair the wire and tape up area with electrical tape. Reroute wires and perform IAC reset procedure as in Steps 4 and 5.
3. If insulation is not worn, reroute wires and perform IAC reset procedure as in Steps 4 and 5. Refer to Section 6E in the appropriate service manual for diagnosis and correction of the condition.
4. Reroute wire harness over the power brake booster vacuum pipe (refer to the illustration).
a. Disconnect power brake booster vacuum pipe at throttle body.
b. Route wire harness over power brake booster vacuum pipe.
c. Connect power brake booster vacuum pipe at throttle body.
d. Install IAC connector into IAC.
5. Perform IAC reset procedure:
a. Turn ignition switch to the "ON" position (engine off).
b. Ground the diagnostic "test" terminal for five seconds.
c. Remove ground.
d. Turn ignition "OFF" for ten seconds.
e. Start engine and check for proper idle operation.