Vacuum Throttle Kicker - Energized With Ignition On

87buick8

Bulletin: 86-6E-24

Date: Oct., '87

Ref.No. 86-211-6E

Corp. Ref. No. 616515

SUBJECT: VACUUM THROTTLE KICKER SOLENOID ENERGIZED WITH IGNITION "ON"


MODELS AFFECTED: 1986 CENTURYS WITH THE LE2 2.8L V-6 ENGINE (VIN CODE X)
The ECM will turn "ON" the subject solenoid if TPS or idle speed are adjusted above specification, which will result in a high idle speed.

If a high idle speed is noted, follow TPS and/or idle speed adjustment procedures in the Service Manual. TPS should be .30 volts with kicker solenoid plunger retracted.

The following page and chart included with this bulletin supersedes the 1986 Service Manual charts.



CHART C-2E-1

VACUUM THROTTLE KICKER

Circuit Description: 2.8L (CARB) "Throttle Kicker" is vacuum operated and extends under the following conditions:
^ Coolant temperature below 85~C (185~F).
^ For 30 seconds after start if coolant temperature above 85~C (185~F).
^ A/C "ON" and pressure cycling switch closed (clutch "ON").
^ Full turn (power steering switch open).



Test Description: Numbers below refer to circled numbers on the diagnostic chart.
1. Checks ECM control of kicker solenoid and for an open in kicker relay coil circuit. TPS should be .30 volts with kicker solenoid plunger retracted and idle speed set to specifications. If TPS and idle speed are above specification, the ECM will energize the kicker solenoid.
2. Checks for open kicker relay coil circuit to ECM.
3. Checks for open ignition circult to kicker solenoid.
4. Checks vacuum source to solenoid, then checks for faulty kicker.
5. Checks to see that power steering switch opens, and the kicker relay contact circult is not open.
6. Checks for grounded WOT relay coil circuit or sticking relay points.
7. Checks for grounded WOT relay coil circuit.