Skylark V6-191 3.1L VIN M SFI (1994)
Throttle Position Sensor: All Technical Service Bulletins
Engine Controls - Rough Running or Hesitation Condition
Group Ref.: Engine Fuel & Emission
Bulletin No.: 436504
Date: April, 1994
SUBJECT:
ROUGH RUNNING OR HESITATION CONDITION (RE-ROUTE THROTTLE POSITION SENSOR WIRE LEAD AND REMOVE ADJUSTABLE
TIE STRAP)
MODELS:
1994 BUICK SKYLARK VINs (SOP - RC270920)
1994 OLDSMOBILE ACHIEVA - VINs (SOP - RM020070
1994 PONTIAC GRAND AM - VINs (SOP - RC746875; OP - RM543936) WITH 3100 ENGINE (VIN M - RPO L82)
Condition:
Some owners may comment on a rough running or hesitation condition. Upon inspection, a Code 21 or 22 may be retrieved.
Cause:
The wire harness containing the throttle position sensor (TPS) connector, EGR solenoid lead, and idle air control (IAC) connector has been retained to
the ABS motor pack. The adjustable tie strap may restrict the movement of the TPS lead on some vehicles during engine torque roll. This restriction may
cause some TPS wires to fray, break, or become detached from the connector.
Correction: (See illustration)
1.
Remove the adjustable tie strap at the ABS motor pack to the wire harness.
2.
Re-route the wire lead for the IAC connector so the lead passes over crankcase vent tube instead of under it.
3.
Re-route wire harness along left side of ABS motor pack.
4.
Repair any damaged connectors with repair kit, J-38125-A.
