You installed a 24x conversion on the Gen I small-block and made the necessary wire harness and injection bank assignment updates. A changed firing order may result in an incorrect DTC notification.įor instance, let’s say you have a PCM from a 2001 Camaro with the LS1 engine.
#Xnip motor firing order software
The calibration table for the assignment of these DTCs is not available within most tuning software packages. The wire harness requires that ignition coil assignments for cylinders 4 and 7, and 3 and 2 be swapped.ĭTCs are assigned to ignition coil control circuits. However, the same logic applies here if using a Gen I small-block engine with the LS-series engine’s 24x crankshaft signal. LS-series engines use a 24-pulse (24x), high-resolution, crankshaft signal for coil-percylinder ignition. Gen I Vortec V-8 engines use a fourpulse, low-resolution, crankshaft signal for single coil and distributor ignition. If the injection bank assignments are wrong, fuel trims are extreme and the engine runs poorly and may even stall.Īlthough the PCMs are the same, the ignition systems are different. The PCM must be calibrated to know which injectors are assigned to bank 1 (cylinders 1, 3, 5, 7) and bank 2 (cylinders 2, 4, 6, 8) so that fuel trims are applied to the proper bank of cylinders. EFILive reveals that General Motors also changed the injection bank assignments table values to follow the wire harness fuel injector assignments.
![xnip motor firing order xnip motor firing order](https://i.pinimg.com/736x/e4/70/48/e470484208f46e32f209500d6f9c76dd.jpg)
![xnip motor firing order xnip motor firing order](https://roadsumo.com/wp-content/uploads/2021/02/Ford-engine-firing-order.jpg)
Now compare this PCM’s fuel injector calibration details for the Gen I small-block and LS-series engine. This schematic represents proper wiring of the eight ignition coils for Gen III and Vortec 8100 8.1L big-block engines with the firing order 1-8-7-2-6-5-4-3. When you compare this PCM’s fuel injector wiring diagrams for the Gen I small-block with the LS-series engines, you see something interesting: General Motors simply swapped injector outputs 4 and 7, and 3 and 2 within the engine wire harness to address the firing order change. Notice that cylinders 4 and 7 have swapped, and cylinders 3 and 2 have swapped. The firing order for the LSseries engines is 1-8-7-2-6-5-4-3. The firing order for the Gen I small-block engine is 1-8- 4-3-6-5-7-2.
![xnip motor firing order xnip motor firing order](https://fordfiringorder.com/wp-content/uploads/2020/10/diagram-v8-firing-order-diagram-full-version-hd-quality-3.jpg)
In model year 2001, General Motors released Gen I small-block and LS-series engines that all used the same PCM (GM# 12200411). You can copy and paste this link to share: Ī very common question goes something like this, “How can I use the LS1 PCM on my Gen I small-block engine when the firing order between the two engines is different?” To answer this question, let’s take a look at how General Motors addressed this issue.
#Xnip motor firing order free
SHARE THIS ARTICLE: Please feel free to share this article on Facebook, in Forums, or with any Clubs you participate in. For a comprehensive guide on this entire subject you can visit this link: LEARN MORE ABOUT THIS BOOK HERE
#Xnip motor firing order how to
This Tech Tip is From the Full Book, HOW TO USE AND UPGRADE TO GM GEN III LS-SERIES POWERTRAIN CONTROL SYSTEMS. Simply put, the ECU can be calibrated for any V-6 or V-8 engine because General Motors designed it that way. We can then agree that this ECU is uniquely programmed so that combustion results are favorable so that the stoichiometric ratio of air to fuel (approximately 14.7 to 1) is achieved during normal operating conditions (and so on). Let’s begin this chapter by agreeing that the “LS1 PCM” is just an ECU that has the designed purpose of controlling the sequencing of ignition and injector events based on a variety of sensor inputs.