WARM ENGINE DECELERATION STALL AND/OR TROUBLE CODE 35

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

VEHICLES AFFECTED: 1992 "N" CAR WITH 2.3L ENGINE (VIN A, D, 3) PONTIAC GRAND AM OLDSMOBILE ACHIEVA BUICK SKYLARK

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:

----------- Repair any damaged wires, tape area, and reroute harness over power brake booster vacuum pipe (see Figure 1).

SERVICE INFORMATION:

Breakpoints:

------------ The wire harness in vehicles built after the following VIN breakpoints have been routed over the power brake vacuum pipe and the condition described above is not likely to occur.

PLANT DIVISION VIN BREAKPOINT ----- -------- -------------- Lansing North Oldsmobile NM451285 Lansing North Pontiac NM077940

Lansing South Pontiac NC270508 Lansing South Buick NC648562

Service Procedure:

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 Figure 1).

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.

For vehicles repaired under warranty use:

Labor Time Allowance: 0.2 hour ADD TIME: Repair wire 0.5 hour

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.