Moses Ludel’s 4WD Mechanix Magazine – Jeep Multi-Point Injection: Operation and Troubleshooting

Moses Ludel’s 4WD Mechanix Magazine – Jeep Multi-Point Injection: Operation and Troubleshooting

How-to: Troubleshooting Jeep Fuel Injected MPI Engines Overview: Jeep ‘PCM’ and Multi-Point Fuel Injection Systems      AMC electronic fuel injection for Jeep engines dates to 1987. From 1987-90, the 4.0L XJ Cherokee benefited from multi-point fuel injection. This reliable Renix system could easily have been adapted to the 4.2L six, a move that would likely have earned […]

Moses Ludel’s 4WD Mechanix Magazine – Tuning and Troubleshooting the 2.5L Jeep TBI Four

Moses Ludel’s 4WD Mechanix Magazine – Tuning and Troubleshooting the 2.5L Jeep TBI Four

How-to: Tuning & Troubleshooting Jeep 2.5L TBI Four-Cylinder Engines In 1986, the AMC 2.5L/150 four cylinder engine gained throttle body injection in the XJ Cherokee applications. This same engine in the Jeep CJ models still used a carburetor. The YJ Wrangler application of the 2.5L, introduced with the 1987 models, came with TBI, making this […]

Moses Ludel’s 4WD Mechanix Magazine – Jeep XJ and MJ Fuel, Spark & Emission System

Moses Ludel’s 4WD Mechanix Magazine – Jeep XJ and MJ Fuel, Spark & Emission System

Q&A How-to: Jeep XJ Cherokee and MJ Comanche—Fuel, Spark & Emissions      Enjoy the many detailed, traditional ‘Q&A’ exchanges in these article columns…’Q & A’ has now moved to open, interactive forum discussions. Visit the forums, you’ll want to join—for free!      Have technical questions about your Jeep 4×4,  popular 4WD truck, SUV, ATV, UTV or dirt motorcycle—or welding and […]

Moses Ludel’s 4WD Mechanix Magazine – Jeep Electrical Troubleshooting & Field Fixes

Moses Ludel’s 4WD Mechanix Magazine – Jeep Electrical Troubleshooting & Field Fixes

      Jeep Technical How-to: Electrical Troubleshooting and Quick Fixes     Troubleshooting skills play a large role in four-wheel drive survival. Many mechanical problems can be repaired in the field.      Although late model Jeep 4WD powertrains and chassis are dependent on modules and electronic components, most of these devices have long service lives. Fortunately, items like the electronic control module, […]

Moses Ludel’s 4WD Mechanix Magazine – Jeep Emission Control Troubleshooting

Moses Ludel’s 4WD Mechanix Magazine – Jeep Emission Control Troubleshooting

Jeep How-to: Tailpipe Emission Controls and Troubleshooting      Note: The PCM is responsible for a number of emissions and evaporative canister functions. As a monitor, the PCM protects the catalytic converter from overheat or damage by watching for engine misfire. Uniquely, the PCM knows when the engine misfires by sensing subtle changes in crankshaft rpm. A […]

Moses Ludel’s 4WD Mechanix Magazine – Use OEM Mopar Oxygen Sensors!

Moses Ludel’s 4WD Mechanix Magazine – Use OEM Mopar Oxygen Sensors!

Jeep 4WD & Ram Truck How-to: Always Use Genuine Mopar Oxygen Sensors! Four-wheeling in the Sweetwater Range or Nevada’s remote high desert country, the Jeep Cherokee must perform reliably. Genuine Mopar parts can make the difference… Tuning and troubleshooting a Jeep engine means more than just parts replacing. Mis-diagnosis or use of wrong parts can […]

Moses Ludel’s 4WD Mechanix Magazine – Jeep Engine Tuning, Diagnostics and Troubleshooting

Moses Ludel’s 4WD Mechanix Magazine – Jeep Engine Tuning, Diagnostics and Troubleshooting

How-to: Jeep Engine Tuning and Troubleshooting     Rapid advances in engine fuel-and-spark management span the modern Jeep era. In 1987, the YJ Wrangler 2.5L four became the first Jeep 4×4 utility model with fuel injection. The 2.5L throttle body injected (TBI) engine was a Cherokee offering as well.      Simultaneously, the 1987-90 YJ Wranglers with 4.2L sixes […]

Moses Ludel’s 4WD Mechanix Magazine – Backcountry Troubleshooting Tools for Jeep Fuel-and-Spark Systems

Moses Ludel’s 4WD Mechanix Magazine – Backcountry Troubleshooting Tools for Jeep Fuel-and-Spark Systems

Field Troubleshooting Tools for Jeep Fuel Injection Systems      Diagnostics can be largely enhanced and refined with the use of dealership-caliber scan tools. When repairs are imminent and the work setting right, advanced diagnostic tools and scanners provide the edge. Off-pavement and far from services, however, some simple tools can help. The quick checks that you can perform […]