2008 Gmc Sierra Firing OrderIt is different from the older small block and big block Chevy parts. Sep 12, 2011 • GMC Envoy Cars & Trucks 0 helpful 1 answer Here is a website with Firing Orders:. An important thing to understand when finding the location of Cylinder 6 is that it’s going to be the sixth cylinder in the firing order. Silverado & Sierra LBZ Duramax Tow Capacity Both Conventional and 5th wheel/gooseneck towing can vary depending on which LBZ Duramax you own. 2008 gmc: a fuel filter door kit that goes. 1 is a beast of an engine and extremely reliable, the fuel economy is one of its biggest downsides. 0L V8 Vortec engine used in the Chevy Express, Silverado HD, and Suburban, as well as the GMC Savana, Sierra HD, and Yukon XL. The firing order and cylinder of 3. 1L Engines Firing order: 1-8-7-2-6-5-4-3 Distributorless ignition system (one coil on each cylinder) Fig. "Firing Order" refers to the sequence at which internal engine cylinders are ignited to produce power. Late Model Chevy Firing Order Application Details. Chevy S10, S15, and GMC Sonoma Pick-Ups 1982-1993 Repair Manual Firing Orders Repair Guide. 3 and 4 Small Block (LS-based engines) Gen. 3 V-6 Firing Order VIN W and VIN X. 3L Engines Firing order: 1-6-5-4-3-2 Distributor. 1L Engines Firing order: 1-8-7-2-6-5-4-3 Distributorless ignition system (one coil for each cylinder) Access our Sierra, Silverado 2006-2007 Firing Orders Repair Guide by creating an account or signing into your AutoZone Rewards account. Avalanche, Sierra, Silverado, C&K Series, 1999. com%2fchevy-5-3-firing-order%2f/RK=2/RS=mw2WRsMlxeihDxTTmGyebpSkXeY-" referrerpolicy="origin" target="_blank">See full list on nerdycar. 99 per vehicle 1-year subscription $39. 3L Vortec Common Engine Problems. Get the BEST auto repair information Alldatadiy. Duramax Firing Order – Prosource Diesel. duramax diesel where can I purchase a fuel filter door kit that goes on wheel well inner liner for a 2008 gmc duramax diesel 6. Cylinder numbering / firing order. 3 Vortec firing order is 1-6-5-4-3-2 and this has a clockwise rotation. 23 L5P 2500HD AT4 - NEW 14 LML 2500HD CC 4x4 - Sold. All stock LS Engines have the 1-8-7-2-6-5-4-3 firing order. An important thing to understand when finding the location of Cylinder 6 is that it’s going to be the sixth cylinder in the firing order. It is clear from the order that it follows a criss-cross pattern firing cylinders on both sides of the crankshaft to produce a balanced power pattern. 1L Engines Firing order: 1-8-7-2-6-5-4-3 Distributorless ignition system (one coil for each cylinder) Access our Sierra, Silverado 2006-2007 Firing Orders Repair Guide by creating an account or signing into your AutoZone Rewards account. The 2008 GMC Sierra firing order is 1-8-7-2-6-5-4-3, which is the same firing order as the other 5. See more Reply Save Like H Hairfarmer. The misfire codes (other than a P0300) identify the engine cylinder that's missing or dead. Here’s what you need to know: 1. It’s and OBD2 code and means that a misfire has been detected in the 8th cylinder in the firing order. GMC Sierra P0305 Definition. com/_ylt=AwriitZcDF9kJikRjiBXNyoA;_ylu=Y29sbwNiZjEEcG9zAzQEdnRpZAMEc2VjA3Ny/RV=2/RE=1683979485/RO=10/RU=https%3a%2f%2fnerdycar. What Does the Term Firing Order Mean? The firing order is the sequence in which each cylinder in a multi-cylinder engine is timed to fire. ">Where is cylinder 7 on a 5. Not only this, but I also go over. 3 liters in a V8 configuration, the. The firing order is specified by the engine manufacturer based on certain factors that affect the performance of the engine, such as vibration and smoothness. Answered by a verified Chevy Mechanic. 6-liter Duramax diesel is 1-2-7-8-4-5-6-3. In this video I explain the customer complaint of engine running rough and found misfire, Thorough check list to trace down misfire, showing the failing part and why it causes misfire, and. by Jake Mayock April 4, 2023, 8:36 pm The firing order 5. Firing order: 1 – 8 – 7 – 2 – 6. This firing order ensures that the fuel and air mixture is distributed evenly across all cylinders for optimal performance and efficiency. 2008 gmc: a fuel filter door kit that goes. 3 vortec engine its misfiring. 3 firing order is 1-8-7-2-6-5-4-3, in the clockwise heading. Sierra, Silverado, C&K Series, 1999. the location of the number one cylinder is important because it is the first cylinder in the engine firing order. 0 Liter V8 Vortec L96 Engine. Late Model Chevy Firing Order Application Details Gen. 8L V6 is quite different from that of the 4. The sequence from the driver’s side is 1-3-5-7. Firing order refers to the ignition sequence of cylinders in an internal combustion engine. P0308 is a fairly common trouble code with the GMC Sierra. An important thing to understand when. How To Troubleshoot A Misfire (GM 4. com--- 1-month subscription $19. Spark plug gap and firing order. It's important to be aware of the firing order when performing. The Yukon and Suburban models were only available with an automatic 4-speed 4L85E transmission. 3 2008">I need to know the firing order the spark in gmc 5. This order is important because it ensures that the engine fires in the correct sequence. Duramax Firing Order – Prosource Diesel">Duramax Firing Order – Prosource Diesel. Check engine light shining nice and bright and one or several of the following trouble codes stored in the PCM's memory: P0300: Random Cylinder Misfire. 3 L is misfiring 11 Answers My Silverado has a misfire when a load is put on the motor ie going up a steep grade or hill. Chevy S10, S15, and GMC Sonoma Pick-Ups 1982-1993 Repair Manual Firing Orders Repair Guide. 0L V8 Vortec L96 is an engine produced by General Motors for use in its full-size heavy duty (HD) pickup trucks, vans, and SUVs. Last Updated on: April 25, 2022 by Robert Woods. LBZ Duramax Specifications. 8L V6 Chevy engines is 1-6-5-4-3-2, and the distributor rotates clockwise. Fueling is driven by sequential multi-port fuel injection. The firing order for a stock 6. Avalanche, Sierra, Silverado, C&K Series, L, L, L and L Engines Firing order: Distributorless ignition system (one coil. 8 V-8 firing order VIN V. An important thing to understand when finding the location of Cylinder 5 is that it’s going to be the fifth cylinder in the firing order. These diagrams include: Fig. It won’t be the fifth cylinder that you might see when looking at the engine. The most important thing to remember about the removal and installation of a distributor, cap or spark plug cable is that all wires MUST be labelled before they are disconnected. The firing order controls the timing of the fuel injection and ignition events, and if it is off, it can cause poor performance and engine damage. 3 V6 Firing Order ©, 2018 Rick Muscoplat. 3 P0307 Clyinder 7 misfire Prognosis/ FIX. The firing order for 3. Firing order affects engine vibration, sound, and power output. After countless computer simulations and engine. In this video I'll go over the firing order and cylinder identification on a GM 3. 1 Vortec Ultimate Engine Guide. " I wonder if you just disconnected the "ground or control circuit" wire described above, if that would disable the dod. Chevy 5. the firing order is utilized by the powertrain control module (pcm) to properly sequence the ignition system firing of the spark plugs and opening of the fuel injectors. GMC Sierra P0305 Definition P0305 is a cylinder specific misfire code, which means that Cylinder 5 is misfiring and causing it. P0305 is a cylinder specific misfire code, which means that Cylinder 5 is misfiring and causing it. Both the head and block are made of cast-iron. There are two basic types, where either cylinder number one is the first to be fired or cylinder number one is the last to be fired. 1L Engines Firing order: 1-8-7-2-6-5-4-3. 1L Engines Firing order: 1-8-7-2-6-5-4-3 Distributorless ignition system (one coil on each. The 2008 GMC Sierra firing order is 1-8-7-2-6-5-4-3, which is the same firing order as the other 5. Late Model Chevy Firing Order Application Details Gen. GMC Sierra P0305 Definition. 3 Chevy Engine? (Explained)">What is the Firing Order on a 5. Firing order: 1-3-4-2. SOURCE: firing order for a 1986 gmc s15. 2L Engine Specs: Performance, Bore & Stroke. Fueling is driven by sequential multi-port fuel injection. There are two ways to disable or delete Active Fuel Management on your GM or Chevy Gen IV LS or LS-based Vortec engine—one is to install an AFM Disabler, and the second is to install an AFM Delete Kit. on v type engines, the bank of cylinders containing cylinder …. 0 liters in a V8 configuration, the L96 is part. The firing order for a Duramax engine is 1-5-4-2-6-3-7. The shift solenoid pattern, also sometimes referred to as solenoid firing order, is as follows; Shift Solenoid Pattern Applications Buick Rainier, 2004–2007 Buick Roadmaster, 1994–1996 Cadillac Escalade, 1999–2006 Cadillac Fleetwood, 1994–1996 Chevrolet Astro, 1993–2005 Chevrolet Avalanche, 2002–2008 Chevrolet S-10 Blazer, 1994–2005. Get the BEST auto repair information. If the engine is left completely stock, there isn't much of a problem with this firing order. Well, I know the firing order is 1 – 2 – 7 – 8 – 4 – 5 – 6 – 3 and the passenger side is odd and drivers side is even numbered and number one is pass, front. The 2008 GMC Sierra firing order is 1-8-7-2-6-5-4-3, which is the same firing order as the other 5. This is also driving around dry, not towing anything. 99 per vehicle 4-year subscription $59. 8L Liter V8 Vortec L20 Engine The L20 is an engine produced by General Motors for full-size van and pickup vehicles. Firing order: 1-2-3-4-5-6. P0308 is a fairly common trouble code with the GMC Sierra. Vortec Common Engine Problems. 0 firing order ©, 2009 Rick Muscoplat. Firing order refers to the ignition sequence of cylinders in an internal combustion engine. It is a 16-valve pushrod overhead valve configuration. know the firing order the spark in gmc 5. GMC Sierra P0305 Definition P0305 is a cylinder specific misfire code, which means that Cylinder 5 is misfiring and causing it. 0 Firing Order VIN N, U — Ricks Free Auto Repair Advice ">6. 8L engine firing order diagram Posted by d camir on Jan 11, 2015 1 Answer mark thompson Expert 62 Answers Cylinder location Drivers - Passengers 1 2 3 4 5 6 7 8 #1 is closest to the front of the truck. In this case, the #1 cylinder is the one you first see on the left looking at the engine from the front of the vehicle. Read More S10 Pickup, Sonoma 2000-2004 Firing Orders Repair Guide Find out how to access AutoZone's Firing Orders Repair Guide for S10 Pickup, Sonoma 2000-2004. 3L Vortec GM engine? Do you have the same problem? Yes No Wednesday, January 11th, 2012 AT 10:56 PM 8 Replies RASMATAZ EXPERT Here is a video of how to gap your spark plugs:. 0 Firing Order VIN N, U — Ricks Free Auto Repair Advice. or Disable Active Fuel Management (AFM) on GM ">How to Delete or Disable Active Fuel Management (AFM) on GM. Which one should YOU choose? If you’re tracking down a wiring issue, Eautorepair. Access our free Firing Orders Repair Guide for Avalanche, Sierra, Silverado, C&K Series, 1999-2005 through AutoZone Rewards. 3L Engines Firing order: 1-6-5-4-3-2 Distributor rotation: Clockwise; Fig. GMC Sierra P0308: Misfire Detected → (cylinder 8). The idle control valve (“ICV”) and throttle position sensors (“TPS”) are prone to failure on all 4. Avalanche, Sierra, Silverado, C&K Series, L, L, L and L Engines Firing order: Distributorless ignition system (one coil. It’s and OBD2 code and means that a misfire has been detected in the 8th cylinder in the firing order. GMC Sierra P0306 Definition P0306 is a cylinder specific misfire code, which means that Cylinder 6 is misfiring and causing it. Access our free Firing Orders Repair Guide for Avalanche, Sierra, Silverado, C&K Series, 1999-2005 through AutoZone Rewards. Liter V8 Vortec L96 Engine. 6 Duramax firing order is 1-5-4-2-6-3-7. 3, V8 309,000 miles, leaks oil now at rear main seal. 3 has firing order 1-8-7-2-6-5-4-3 starting from cylinder #1. Find out how to access AutoZone's Firing Orders Repair Guide for Chevy S10, S15, and GMC Sonoma Pick-Ups 1982-1993 Repair Manual. 2008 Sprinter 2500 170 - camper van. 3L Engines Firing order: 1-6-5-4-3-2 Distributor rotation: Clockwise Fig. Your info looks correct, but I'd wait for someone to chime in that has the Factory service manuals handy just in case. 3 is very important for the Gen III Small Block Series. 8L Liter V8 Vortec L20 Engine. In this video I explain the customer complaint of engine running rough and found misfire, Thorough check list to trace down misfire, showing the failing part and why it causes misfire, and some. It won't be the fifth cylinder that you might see when looking at the engine. For gas engines, this means spark plug operation order. 2008 GMC Sierra Firing Order: A Complete Guide. They include wiring diagrams and technical service bulletins. Firing order: 1-3-4-2. Firing order: 1-6-5-4-3-2. GMC Sierra P0305 Definition P0305 is a cylinder specific misfire code, which means that Cylinder 5 is misfiring and causing it. Firing order is 1, 5, 3, 6, 2, 4. 3L Engines Firing order: 1-6-5-4-3-2 Distributor rotation: Clockwise. The firing order on a car engine is determined by the number of cylinders contained within that engine. The factory firing is 1-2-7-8-4-5-6-3, but this new camshaft design changes that to 1-5-6-3-4-2-7-8. Firing order affects engine vibration, sound, and power output. 8L motor, it ruled from 1999 to 2007. P0306 is a cylinder specific misfire code, which means that Cylinder 6 is misfiring and causing it. P0308 is typically caused by bad spark plugs, plug. Firing order refers to the ignition sequence of cylinders in an internal combustion engine. 4L Engines Firing order: 1-8-4-3-6-5-7-2 Distributor rotation: Clockwise. GMC Sierra P0306 Definition P0306 is a cylinder specific misfire code, which means that Cylinder 6 is misfiring and causing it. When all enabling conditions for V4 mode are met, the ECM will command the low side driver to turn ON, grounding each VLOM solenoid control circuit, in engine firing order sequence. VIN V Firing Order ©,2009 Rick Muscoplat. Sep 12, 2011 • GMC Envoy Cars & Trucks 0 helpful 1 answer Here is a website with Firing Orders:. 3L V6 Firing Order and Cylinder Numbers 3. The cylinder numbering on the 3. Late Model Chevy Firing Order. 1L Engines Firing order: 1-8-7-2-6-5-4-3 Distributorless ignition system (one coil for each cylinder) Access our Sierra, Silverado 2006-2007 Firing Orders. The misfire codes (other than a P0300) identify the engine cylinder that's missing or dead. In this video I explain the customer complaint of engine running rough and found misfire, Thorough check list to trace down misfire, showing the failing part. I need to know the firing order the spark in gmc 5. Firing Camshaft: Strengthening A Duramax">Alternate Firing Camshaft: Strengthening A Duramax. Distributor rotation: counterclockwise Fig. 3 Vortec firing order is 1-6-5-4-3-2 and this has a clockwise rotation. An important thing to understand when finding the location of Cylinder 5 is that it’s going to be the fifth cylinder in the firing order. Combined driving results in about 10mpg. This order is important because it ensures that the engine fires in the correct sequence and prevents damage. Firing order for 2008 gmc 1500 show picture. So, it’s mostly a code for V8+ engines. How to Know Which Cylinder is Number One. Find out how to access AutoZone's Firing Orders Repair Guide for Chevy S10, S15, and GMC Sonoma Pick-Ups. Sierra 2500HD and 3500HD; Chevy Suburban 2500; GMC Yukon 2500; Chevy Express and Avalanche; Chevy Kodiak; 2001-2009: Malibu and MasterCraft boats (engine made by Navistar) Various RV’s. First Cylinder Number 1 is on the driver’s side, ahead of Cylinder Number 2. It utilizes the overlap cylinder numbering system. 0L)">How To Troubleshoot A Misfire (GM 4. It won’t be the sixth cylinder that you might see when looking at the engine. Cruising down the highway at 55 mph, transmission in overdrive, the rpm's drop to around 1500 or 1400 2000 Chevrolet Silverado 1500 LS RWD -. For marketing purposes, it was also known as the Vortec 6200. What is the Firing Order on a 5. There are two ways to disable or delete Active Fuel Management on your GM or Chevy Gen IV LS or LS-based Vortec engine—one is to install an AFM Disabler, and the second is to install an AFM Delete Kit. 8 liters in a V8 configuration, the L20 is part of the. 8L Vortec engines from this era. 1-5-6-3-4-2-7-8 is an alternate firing order if you have difficulties with this one. 6-liter Duramax is known for being on the weaker side. The firing order controls the timing of the fuel injection and ignition events, and if it is off, it can cause poor performance and engine. GMC Sierra P0308: Misfire Detected → (cylinder 8 ">GMC Sierra P0308: Misfire Detected → (cylinder 8. Why would you need the firing order, this engine does not have plug wires, each plug has its own coil pack, each coil pack is controlled by the computer. 1L Vortec) Cylinder Numbering Front to back 1, 3, 5, 7 on the driver side 2, 4, 6, 8 on the passenger side Firing Order 1-8-7-2-6-5-4-3. GMC: Sierra 1500 Denali: 8: 2007-08: GMC: Yukon Denali, Yukon XL 1500 Denali: 8: 2007-08: Cadillac: Escalade, Escalade ESV, Escalade EXT: 8: 2008: Chevy: Tahoe. 1L Engines Firing order: 1-8-7-2-6-5-4-3 Distributorless ignition system (one coil for each cylinder). Other cylinders are on the rear side with sequence numbering as 2, 4, and 6. 1L Engines Firing order: 1-8-7-2-6-5-4-3 Distributorless ignition system (one coil for each cylinder) Access our Sierra, Silverado 2006-2007 Firing Orders Repair Guide by creating an account or signing into your AutoZone Rewards account. net are professional-grade shop manuals—period. Santa Fe, Vera Cruz 2006-2008 Firing Orders Repair Guide Find out how to access AutoZone's Firing Orders Repair Guide for Santa Fe, Vera Cruz 2006-2008. So, it's mostly a code for V8+ engines. Firing order refers to the ignition sequence of cylinders in an internal combustion engine. 5 Small Block (LT-based engines) Gen. Firing order: 1-6-5-4-3-2. Check engine light shining nice and bright and one or several of the following trouble codes stored in the PCM's memory: P0300: Random Cylinder Misfire. Distributor rotation: clockwise Fig. Firing Order and Cylinder Identification GM 3. GMC Sierra P0306 Definition. An important thing to understand when finding the location of Cylinder 5 is that it's going to be the fifth cylinder in the firing order. 2 Firing Order & Cylinder …. The cylinder balance test should be done by unplugging the electrical connector of the fuel injector or the COP Coil. Where is cylinder 7 on a 5. 3 Chevy Engine? (Explained). Engines having two cylinder banks, such as the V-2, V-4, and V-6 may also use this Duramax cylinder arrangement. What Does the Term Firing Order Mean? The firing order is the sequence in which each cylinder in a multi-cylinder engine is timed to fire. They include wiring diagrams and technical service bulletins. Firing order: 1-2-3-4-5-6. 3L Engines Firing order: 1-6-5-4-3-2 Distributor rotation: Clockwise Fig. You can also define it as the order in which power is distributed across different engine cylinders. Firing order for 2008 gmc 1500 show picture - Fixya Home Forum Cars & Trucks GMC Sierra 1500 2008 GMC Sierra 1500 Firing order for Share on Facebook Share on Twitter Share on Pinterest Share by Email Question about 2008 GMC Sierra 1500 Open Question Posted by Anonymous on Feb 24, 2013. This order is important because it ensures that the engine fires in the correct sequence and prevents damage. Engine Firing Order Diagram 2006 GMC C5500 8. Being a V6 engine it has 6 cylinders thus a firing order of a number of sequences 6. It also portrays the dispersion of force in multi-cylinder engines. On the other hand, the order of cylinders is 2-4-6-8. However, the crankshaft on the 6. 3 Firing Order (Cylinder Numbers With Diagrams). 2 Firing Order & Cylinder Numbers. the location of the number one cylinder is important because it is the first cylinder in the engine firing order. Why would you need the firing order, this engine does not have plug wires, each plug has its own coil pack, each coil pack is controlled by the computer. The shift solenoid pattern, also sometimes referred to as solenoid firing order, is as follows; Shift Solenoid Pattern Applications Buick Rainier, 2004–2007 Buick Roadmaster, 1994–1996 Cadillac Escalade, 1999–2006 Cadillac Fleetwood, 1994–1996 Chevrolet Astro, 1993–2005 Chevrolet Avalanche, 2002–2008 Chevrolet S-10 Blazer, 1994–2005. 3L V6 Firing Order & Cylinder Numbers. Late Model Chevy Firing Order Application Details. In this video I explain the customer complaint of engine running rough and found misfire, Thorough check list to trace down misfire, showing the failing part. As per research, it is said to be the most famous and renowned Engine among LS Engines. 2008 Chevrolet Silverado 1500 Work Truck Extended Cab RWD - Silverado 5. This firing order. The idle control valve (“ICV”) and throttle position sensors (“TPS”) are prone to failure on all 4. Power was put to the ground either with an Allison 1000 transmission or a ZF 6-speed. 3 P0307 Clyinder 7 misfire Prognosis/ FIX">GMC Sierra 5. Posted on April 8, 2018 by Rick Muscoplat. Check out our complete LBZ Tow Capacity guide below to find out how much your truck can tow! Make sure you check with your owners manual or with GM directly to find out your exact tow ratings. 3 firing order is 1-8-7-2-6-5-4-3, in the clockwise heading. 8 V-8 Firing Order VIN V 4. 6L LBZ Duramax Specifications. 2008 Chevrolet Silverado 1500 Work Truck Extended Cab RWD - Silverado 5. Answer ID 4970 | Published 05/09/2018 09:58 AM | Updated 09/17/2018 02:01 PM. 3 engines, which can result in poor idling, engine stalling, bad acceleration, and other low-rpm running problems. In most cases, their diagrams are right from the factory manuals. Firing Order and Cylinder Identification GM 3. Ask your Chevrolet firing order diagrams related question. Firing Order 1-8-7-2-6-5-4-3 Posted on Jan 11, 2015 Add Your Answer Sep 01, 2009 • 1992 Cadillac DeVille. When the engine is stock, the firing order isn’t an issue. What Does the Term Firing Order Mean? The firing order is the sequence in which each cylinder in a multi-cylinder engine is timed to fire. For diesel engines, it means the order of when fuel is injected into each cylinder. Firing order is 1, 5, 3, 6, 2, 4. GMC Sierra P0305: Cylinder 5. FIRING ORDERS To avoid confusion, ALWAYS replace spark plug wires one at a time. It’s just something we wanted to try and help reduce part breakage in the Duramax application. Cylinder Firing Orders & Engine Diagrams. The firing order is specified by the. net--- 1 month subscription $19. GMC Sierra P0306: Misfire Detected (Cylinder 6). 1 Vortec averages about 12-14mpg on the highway and 7-9mpg in the city. You should only be seeing this code if you have an engine with at least 8 cylinders. For diesel engines, it means the order of when fuel is injected into each cylinder. Being a V6 engine it has 6 cylinders thus a firing order of a number of sequences 6. 3L V8 Vortec LC9 was an engine produced by General Motors for use in the 2006-2014 GMT900-based Chevrolet Suburban 4WD and GMC Yukon XL 4WD. On the other hand, LS Engines have the new 1-8-7-2-6-5-4-3 firing order. How to Delete or Disable Active Fuel Management (AFM) on GM. If no misfire trouble codes are present or you have a P0300, then a cylinder balance test is recommended to find the misfiring cylinder. SOURCE: firing order for a 1986 gmc s15. The firing order of SBC and BBC is 1-8-4-3-6-5-7-2. Chevy S10, S15, and GMC Sonoma Pick-Ups 1982-1993 Repair Manual Firing Orders Repair Guide. It's and OBD2 code and means that a misfire has been detected in the 8th cylinder in the firing order. cylinder on a Duramax Diesel 6. 4, small block engine used in GM luxury trucks and SUVs between 2007 and 2008. When all enabling conditions for V4 mode are met, the ECM will command the low side driver to turn ON, grounding each VLOM solenoid control circuit, in engine firing order sequence. Access our free Firing Orders Repair Guide for Avalanche, Sierra, Silverado, C&K Series, 1999-2005 through AutoZone Rewards. stock 4L60E on 5th filter/fluid change; 2nd set of drive shaft u-joints; rear diff new bearings; 2nd fuel pump and fpr; ABS pump circuit solder reflowed; 4th water pump; 2nd fan clutch; new front wheel bearing units; new front and. For gas engines, this means spark plug operation order. Changing an engine’s firing order isn’t a new science, as GM gas guys have been doing it for years in with the LS engine 4-7 swap. 3 Liter V8 Vortec LC9 Engine. 6 … read more GM_MASTER_DENNY Shop Foreman High School or GED 177 satisfied customers 2004 GMC Sierra 3500: fuel injectors. The sequence then continues to the right as 1, 3, and 5. 6 Duramax firing order is 1-5-4-2-6-3-7.