Diverter/Electric Switching Valve - Noise

Number 84-6 (Gasoline)-50 Date 7/84

Subject: NOISY PRESSURE OPERATED ELECTRIC DIVERTER/ELECTRIC SWITCHING (PEDES) VALVE-1984 BUICK BUILT V-6 ENGINES

Figure 1:

A popping noise may be emitted from the (PEDES) A..I.R. management valve. This noise may occur due to one of two possible causes. It may be caused by a missing solenoid plug on the black converter solenoid, see illustration.

The other possible cause for noise is a missing "O" ring between the black solenoid and the air management valve, see illustration.

A new solenoid, Part Number 17110655, has been released for service to repair this condition. Included with this solenoid will be two (2) "O" rings.

Procedure for replacement of black solenoid on (PEDES) Valve.

PRESSURE OPERATED ELECTRIC DIVERT/ELECTRIC SWITCHING VALVE:

A. Disconnect electrical connector from black solenoid, see Figure 2.

SOLENOID TAB LOCATIONS:

B. Release both retaining tabs from solenoid, using a suitable screwdriver, see Figure 3.

C. Remove solenoid and "O" ring.

D. Lightly lubricate and install the new "O" ring, over nipple of pressure tube. (New solenoid is supplied with two (2) "O" rings, only one of which is required at this time.)

E. Install new solenoid using care to align opening in solenoid with pressure nipple on valve, and snap into both retaining tabs firmly.

F. Connect solenoid electrical connection.

G. Inspect and verify proper operation of PEDES valve. See Section 6-E "Driveability and Emissions - Carbureted" in the Chassis Service Manual.

DIAGNOSTIC NOTE

If the "O" ring is missing or leaking on the gray connector solenoid, air will be diverted to the exhaust manifolds which will cause lean exhaust, low oxygen sensor voltages, fixed 10~ dwell (duty cycle) and possibly a code 44 to be set.

Warranty Claim Information

Operation Number T5069
Labor Time Allowance for one Solenoid .2
Labor Time Allownace for both Solenoid .3
Failure Code 92