C 2500 3/4 Ton Pickup 2WD V8-379 6.2L DSL VIN J FI (1984)
Glow Plug: Customer Interest
Diesel Engine - Hard Start/Gray or White Smoke
Bulletin No.: 00-06-04-002
File In Section: 06 - Engine/Propulsion System
Date: January, 2000
Subject:
Hard, No Start or Excessive Gray or White Smoke On Start Up After Recent Glow Plug Replacement (Replace Glow Plugs)
Models:
1982-99 Chevrolet and GMC C/K, G, P, R, V Models
with 6.2 L or 6.5 L Diesel Engine (VINs C, J, F, P, S, Y - RPOs LH6, LL4, L65, L49, L56, L57)
Condition
Customers may comment on a hard start cold (normally under 32°F or 0°C) with excessive white or gray smoke on vehicles that have had glow plug
replacement after January, 1999. This bulletin does not apply to original equipment glow plugs installed in production vehicles, only service plugs.
Cause
Certain service 11G glow plugs (P/N 25168651 or equivalent) produce insufficient heat energy to the cylinder during cold starting pre-glow.
Correction
This table may be used to help identify glow plug type.
Perform normal diagnostics on the hard start, gray or white smoke condition. If normal diagnostics do not lead to resolution of the symptom, determine if
the glow plugs have been replaced since January, 1999. If they have, it will be necessary to determine if the service glow plugs are low heat energy units.
Remember, not all 11G glow plugs are low heat energy plugs even though they do have the same part number (P/N 25168651). It is important to
properly identify the type of glow plug using visual characteristics and Julian date prior to initiating any repairs.
The low heat energy 11G glow plugs can be visually identified by performing an examination of the plug. There are three identifying characteristics of
these glow plugs:
