19NA246
Service Bulletin Details
Public Details for: 19NA246
This technical bulletin provides a procedure to correct a condition of engine runs rough, misfire or mil illuminated with P0300 set.
- 2019 -
Models from 2019
2019 BUICK ENVISION |
2019 BUICK REGAL |
2019 CADILLAC ATS |
2019 CADILLAC CTS |
2019 CHEVROLET CAMARO |
2019 CHEVROLET TRAVERSE |
Bulletin No.: Service Bulletin Date: 19-NA-246 December, 2019 TECHNICAL Subject: Engine Runs Rough, Misfire, Malfunction Indicator Lamp (MIL) Illuminated - DTC P0300 Set This bulletin replaces PIP5661. Please discard PIP5661. Brand: Buick Cadillac Chevrolet Model: Model Year: from VIN: to from to Engine: Transmission: Envision All Regal (AWD Only) ATS CTS 2019 2019 2.0 LTG All All Camaro All Traverse All Involved Region or Country United States, Canada, Mexico, Korea, Japan, Russia, Australia Condition Some customers may comment on one or more of the following conditions: • Rough running engine • Misfire • MIL Illuminated Some technicians may find DTC P0300 (Engine Misfire Detected) set in the Engine Control Module (ECM). This condition may be caused by the talc powder, inside the rubber boot of the ignition coil, having a lower insulation strength compared to dielectric grease: Cause Copyright 2019 General Motors LLC. All Rights Reserved. ⇒ This may lead to possible arcing, eventual carbon tracking and ultimately, a misfire condition. A prolonged misfire condition can result in piston damage. ⇒ Talc was applied to prevent sticking of the rubber boot to the porcelain plug for serviceability. Page 2 December, 2019 Bulletin No.: 19-NA-246 Correction 5423956 1. Inspect all the spark plugs for signs of carbon tracking. 2. Perform a cylinder leak down test on the affected cylinder(s), making sure the misfire is not caused by piston leakage and leakage into the crankcase. Refer to Cylinder Leakage Test in SI. • If there is no high cylinder leakage found, refer to the Spark Plug Inspection Procedure section in this bulletin. • If there is high cylinder leakage found, refer to the Piston and Engine Cylinder Bore Inspection section in this bulletin. Information Spark Plug Inspection Procedure This document assists the technician with diagnosis and repair of a misfire for specific scenarios as follows: Scenario #1 - Misfire being caused by spark plug carbon tracking. Correction - Replace all four spark plugs, all four ignition coils, apply dielectric grease to the spark plug boots. Scenario #2 - Misfire is being caused by a damaged piston and the cylinder wall is damaged. Correction - Replace the engine assembly (engine comes with spark plugs), all four ignition coils (apply dielectric grease to the spark plug boots), the fuel injector of the cylinder(s) that had damaged pistons and other components necessary when an engine assembly is installed. Scenario #3 - Misfire being caused by a damaged piston and the cylinder wall is not damaged. Correction - Replace all four spark plugs, all four ignition coils (apply dielectric grease to the spark plug boots), the fuel injector of the cylinder(s) that had damaged pistons, all four piston kits, all ring sets for all four pistons, all rod bearings, all four connecting rod assemblies and other components necessary when pistons are replaced. 5377263 If any carbon tracking is seen on any of the spark plugs, replacement of all four spark plugs and all four coils is required. Important: All the ignition coil boots will require proper application of dielectric grease. Only use the green color dielectric grease (USA 19260901 / Canada 19260902). Do Not use the white/clear dielectric grease as it will not work for this application. Apply it correctly or the engine conditions/damage may re-occur. Bulletin No.: 19-NA-246 December, 2019 Page 3 Dielectric Grease Application 5423998 Use Molykote G-5008 Dielectric Grease. 5424004 5424001 1. Inspect all the ignition coils for grease or if additional grease is required. ⇒ If additional grease is required, place a small amount on a applicator stick or equivalent. Note: Small amounts of grease “over spread” are allowed on the spring. 2. Apply a thin coating in the rubber boot of the coil, up to a depth of 15 mm. Page 4 December, 2019 Bulletin No.: 19-NA-246 5424006 3. Remove any excess grease from around the end of the boot and ensure there is not an excessive amount within the boot. 5424009 The graphic above depicts grease applied evenly to the inside of the boot, from the end of the terminal to the end of the boot. Bulletin No.: 19-NA-246 December, 2019 Page 5 Piston and Engine Cylinder Bore Inspection Inspect the condition of all cylinder walls. Some light vertical marks may be visible on the cylinder wall. In these areas, check that the cross hatch marks are still visible in this marked area. If they are, the cylinder surface has not been compromised and the engine block can be used. If you can catch your fingernail on anything on the cylinder wall, the engine assembly must be replaced. • If any of the cylinder walls are damaged, replace the engine assembly (engine comes with spark plugs), all four ignition coils (apply dielectric grease to the spark plug boots. Refer to Dielectric Grease Application section above), the fuel injector of the cylinder(s) that had damaged pistons and other components necessary when an engine assembly is installed. • If the cylinder walls are not damaged, remove the pistons and inspect for a fractured piston between the top and second rings. The pictures below are some examples of what might be found. 5375219 5375220 5375218 If the cylinder walls are not damaged and one or more of the pistons are found fractured, replace all four spark plugs, all four ignition coils (apply dielectric grease to the spark plug boots. Refer to Dielectric Grease Application section above), the fuel injector of the cylinder(s) that had damaged pistons, all four piston kits, all ring sets for all four pistons, all rod bearings, all four connecting rod assemblies and other components necessary when pistons are replaced. Note: When installing pistons, make sure to use the tapered ring compressor J-43953 special tool. Use care when installing the piston assemblies into the cylinder so the rings are not damaged. Page 6 December, 2019 Bulletin No.: 19-NA-246 Parts Information Causal Part N/A Description Molykote G-5008 Dielectric Grease* Part Number Material Allowance GM service P/N 19260901 (Canadian P/ N 19260902) $1.38 (U.S.) $1.70 (Canada) *There is enough material to do approximately 15 vehicles. Store the remaining material for future use. Warranty Information Note: Only use the appropriate labor operation for the repair performed. For vehicles repaired under warranty, use: Labor Operation Description Labor Time 4020061 Spark Plug Replacement Multiple 4066890 Piston, Connecting Rod, and Bearing Replacement 4067490 Engine Replacement Use Published Labor Operation Time Version 2 Modified Released October 30, 2019 Revised December 12, 2019 - Add additional information to the Correction section and specified to use green grease in the Spark Plug Inspection section. GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these 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 your GM dealer for information on whether your vehicle may benefit from the information. WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION