EGR - Engine Surge At Part Throttle or Climbing Grade

Number:
92-292-6E

Section:
6E

Date:
SEPT. 1992

Corporate Bulletin No.:
236513

ASE No.:
A1, A8



Subject:
ENGINE SURGE AT PART THROTTLE OR WHILE CLIMBING GRADE


Model and Year:
1991-92 S TRUCK WITH 2.5L ENGINE



Condition:

Some owners of 1991-92 S-trucks with the 2.5L L38 engine (Vin Code A), Federal emissions, manual transmission and 3.73 rear axle may comment of an engine surge occurring in the RPM range of 2000-2500 RPM, at a steady throttle or while climbing a slight grade.

Cause:

Unstable combustion due to EGR (Exhaust Gas Recirculation) flow.

Correction:

Install a new memcal and EGR valve.

Memcal P/N:
16183223

Scanner ID:
3241

Broadcast Code:
BCNX

EGR Valve P/N:
17112238

Part Availability:

Parts are currently available from GMSPO.

Warranty Information:

Labor Operation:
T0500 Memcal

Labor Time:
.5 Hr.

Labor Operation:
J6270 EGR Valve

Use applicable labor time guide for labor hours.