Caprice Wagon V8-305 5.0L (1986)
Accelerator Pump: Customer Interest
Engine - Hesitation On Tip-In Acceleratio
Number:
87-279-6E
Section:
6E
Date:
MARCH, 1988
Subject: HESITATION ON TIP-IN ACCELERATION
Model and Year:
1986-87 CAPRICE CLASSIC, CAMARO, MONTE CARLO, EL CAMINO WITH 5.0L (VIN CODES H OR G) ENGINES
TO:
ALL CHEVROLET DEALERS
Some 1986 and early 1987 Chevrolet vehicles equipped with 5.0L LG4 or L69 engines not featuring carburetor, P/N 17087306, may experience
hesitation on sharp tip-in maneuvers with a fully warmed up engine.
This condition sometimes referred to as "pump slug" may be addressed by installation of a bi-metal accelerator pump check ball spring kit, P/N
17112032. This kit includes a pump discharge plug and a temperature compensated pump discharge ball spring. The original pump discharge ball
should be used.
Service Procedure:
1.
Disconnect the negative battery cable.
2.
Remove the air cleaner.
3.
Remove the carburetor air horn. (Refer to Section 6C1 of service manual if details of disassembly are needed).
4.
Remove the solenoid adjusting screw plug from the air horn.
5.
Remove the solenoid plunger, air horn gasket, accelerator pump assembly, metering rods and float bowl insert.
6.
Count and record the number of turns of the solenoid adjusting screw required to lightly bottom the mixture control solenoid.
7.
Remove the mixture control solenoid assembly.
8.
Remove the float and needle.
9.
Remove the pump discharge plug.
10.
Install the new accelerator pump check ball spring and pump discharge plug provided in the kit, P/N 17112032. See Illustration.
11.
Reinstall the float and needle. (Hook needle pull clip over float lever cross bar facing seat. Do Not Hook through holes in float lever).
12.
Reinstall the mixture control solenoid.
13.
Reinstall solenoid adjusting screw and turn it to lightly bottom solenoid, then back out the number of turns counted during disassembly.
14.
Reinstall float bowl insert metering rods, pump assembly, air horn gasket and solenoid plunger.
15.
Reinstall the carburetor air horn.
16.
Reinstall the solenoid adjusting screw plug.
17.
Reinstall the air cleaner.
18.
Reconnect the negative battery cable.
Labor Operation Number:
T1217
Labor Time:
Caprice classic
Monte Carlo
.9 Hours
El Camino
Camaro
1.1 Hours
