For 1990-2009 cars

# CHUGGLE/DETONATION (REPLACE PROM)

#### SUBJECT: CHUGGLE/DETONATION (REPLACE PROM)

#### VEHICLES AFFECTED: 1991-92 "D" MODEL WITH W/5.0L AND 5.7L ENGINES

This bulletin is being revised to add the 5.0L engine, change warranty statement, add additional part numbers, and add more conditions.

Some 1991-1992 Broughams (RWD) with 5.0L (L03) or 5.7L (L05) TBI engines may experience one or more of the following driveability conditions:

o Tip-in sag o Tip-in hesitation o Long crank time when cold o Detonation o Chuggle (this pertains to 5.7L engines only)

To repair the above conditions refer to the chart listed below and install the appropriate component(s) for the specified vehicle with the appropriate model year and engine classification.

MODEL YEAR 1991 & 1992 Service Ser. PROM Broadcast Service Vehicle Engine P/N I.D.* Code P/N ----------------------------------------------------------------------------- D Fed/Cal 5.0 PROM 16160477 0531 AXHR #ESC 16175099 #ESC 16175099

D Fed/Cal 5.7 PROM 16195060 5111 BHHM Same as 91

D Export 5.7 PROM 16195064 5121 BHHN Same as 91 (leaded)

* ECM PROM I.D. can be read with a scan tool connected to the ALDL connector.

# Refer to Section 6E2-C5 of the appropriate Information Manual for proper installation of the Electronic Spark Control (ESC) module.

For vehicles repaired under warranty use:

Operation Description Number Vehicle Series D --------------------- ------ ---------------- MEM-CAL - Replace J6364 .4 ESC Module - Replace J4438 .2

For vehicles repaired under warranty use:

** BULLETIN REFERENCES: Corporate Ref. 376505

General Motors of Canada 93-6E-123

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.