Fuel - No A/T Downshift/80-85% Throttle

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NUMBER: 92-T-37

CORP.REF.NO: 167106

DATE: February 1992

SECTION: 6C, 6E2, 7A


SUBJECT:
NO TRANS DOWNSHIFT AND/OR 80-85% THROTTLE
- INSTALL REVISED ACCELERATOR CABLE AND/OR PEDAL ASSEMBLY

MODELS/YEARS:
1991-92 BRAVADA WITH 4.3L (VIN Z) ENGINE


Some 1991-92 Bravadas equipped with a 4.3L (VIN Z) engine may exhibit some of the following symptoms:
poor performance, lack of power, sluggishness and/or no downshift.

Important: These symptoms may feel like a transmission failure (lack of response) but transmission replacement is not necessary.

These symptoms may be due to the accelerator cable being too long and/or the accelerator pedal having incorrect geometry. When one or both of these conditions are present, full throttle is not achieved. To correct this condition, replacement of accelerator pedal and/or cable with revised units is necessary.

VEHICLES INVOLVED
Certain 1991-92 Bravadas equipped with 4.3L (VIN Z) engines built before vehicle number 1GHDT1329N2701859 for the accelerator cable and vehicle number 1GHDT1324N2701789 for the pedal/lever assembly.

SERVICE PROCEDURE

1. Before replacing the accelerator cable and/or pedal assembly, connect a TECH 1 or similar testing device to get a throttle position sensor (TPS) voltage reading. TPS voltage at idle should be less than 1.0 volts (approximately 0.6 volts). With the engine off and the accelerator pedal depressed to wide open throttle, the TPS voltage should read about 4.6 volts.

When the accelerator pedal is depressed and voltage readings are less than the previously mentioned voltage specifications, replace the pedal assembly with a redesigned pedal assembly (P/N 15679725, currently available from GMSPO).





Important: Make sure during pedal assembly installation that the insulation mat does not get trapped between the pedal assembly and dash panel. See the illustration.

Refer to the 1992 Bravada Service Manual, page 6E2-C2-22 & 23 for proper accelerator pedal removal and installation procedures.

2. Retest the TPS voltage. If voltage readings are still below specified levels, replace the accelerator cable with a redesigned cable (P/N 15693481, currently available from GMSPO).

Refer to 1992 Bravada Service Manual, page 6E2-C2-22 for proper accelerator cable removal and installation procedures.