Ignition System - Engine Bucks/Intermittent Miss
NO: 18-12-94GROUP: Vehicle Performance
DATE: Jul. 8, 1994
SUBJECT:
3.5L Engine Buck Or Intermittent Miss
MODELS:
1993 LH Concorde/Intrepid/Vision
NOTE:
THIS BULLETIN APPLIES TO 1993 MODEL YEAR VEHICLES EQUIPPED WITH A 3.5L ENGINE AND BUILT PRIOR TO 11-30-92 (MDH 11-30-XX)
SYMPTOM/CONDITION:
Buck or intermittent engine miss at vehicle speeds of 40 to 55 mph, especially during full EMCC (Electronic Modulated Converter Clutch) operation.
DIAGNOSIS:
Using the Mopar Diagnostic System (MDS) or the Scan Tool (DRBII or III) with appropriate diagnostic procedure manual, verify that all engine/transmission systems are functioning as designed. If Diagnostic Trouble Codes (DTC's) are present, record them on the repair order for future reference, and repair as necessary. If no codes are present and all systems are functioning correctly, proceed with the following.
Check for the presence of oil in the spark plug tubes; pull all 6 spark plug boots out and inspect each tube, using a light for the presence of liquid oil in the tube. (Refer to Technical Service Bulletin 08-28-93, Engine Spark Plug Discoloration, for information regarding brown stain on the plug insulator.) If oil is detected, perform the following repair.
PARTS REQUIRED:
6 4573938 Tube - Spark Plug
6 4573943 Nut - Spark Plug Tube
6 4536538 Seal - Spark Plug Tube
6 4609076 Spark Plug
1 4728944 Cable Set
2 4556593 Gasket - Cylinder Head Cover
2 4556557 Gasket - Intake Manifold To Head
1 4556556 Gasket - Plenum to Intake Manifold
REPAIR PROCEDURE:
This bulletin involves replacing the spark plugs, tubes, seals, and cable set.
1. Replace the spark plugs, spark plug cables, and spark plug tubes following the procedures outlined in the New Yorker, LHS, Concorde, Intrepid, and Vision Service Manual, Publication No.81-270-3140.
NOTE:
THE SPARK PLUG TUBE MUST BE FULLY SEATED TO INSURE A PROPER SEAL. TIGHTEN THE TUBE TO 61 N-m (45 FT.LBS.)
POLICY: Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Labor Operation No: 09-35-18-91 2.3 Hrs.
FAILURE CODE: 65 - Leaks