EXPERTEC TSB (376511)

Publication date: 1993-09-03
Reference number: 376511

EXPERTEC TSB

TECHNICAL SERVICE BULLETIN

Reference Number(s): 376511, Date of Issue: 09/03/93

EXHAUST ODOR/COLD SHIFT SAG/ - COLD HESITATION ON LIGHT ACCEL

Model(s): 1993 CHEVROLET AND GMC C/K/G TRUCKS W/5.7L (L05) ENGINE UNDER 8600 GVW

Bulletin No.: GMC 376511

Date: 09/03/1993

CONDITION

Some owners of 1993 model year C/K Trucks and G Vans with 5.7L (L05) V8 engines (VIN K) may comment on one or all of the following conditions:

Exhaust odor (H2S).
Cold start sag.
Hesitation/flat feel on light acceleration during the warm-up period on cold start.

CAUSE

Air fuel mixture was not optimally calibrated for all operating conditions.

CORRECTION

If normal diagnostics and service procedures do not correct any of the above conditions, a revised calibration MEMCAL should be installed (see table below).

PARTS INFORMATION

Fig 1: 1993 L05 (5.7L) WITH M30 (4L60E) TRANSMISSION ONLY

Fig 2: 1993 L05 (5.7L) WITH M30 (4L60E) TRANSMISSION ONLY

NA5: Federal Emissions

NA6: Emission System, High Altitude Requirements

NB2: Emission System, California

Parts are currently available from GMSPO.

WARRANTY INFORMATION

Labor Operation Labor Time

T0500 0.6 hrs. - C/K Trucks

0.5 hrs. - G-Van