Jeep Q&A: YJ and TJ Wrangler Fuel, Spark and Emission System

Jeep Q&A: YJ and TJ Wrangler Fuel, Spark and Emission System

Jeep Q&A: YJ and TJ Wrangler Fuel, Spark & Emission Systems      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 Fuel Pressure Requirements

Moses Ludel’s 4WD Mechanix Magazine – Jeep Fuel Pressure Requirements

Jeep How-to: Fuel Pressure Needs for Carburetion and Fuel Injection      Carburetion and TBI run at a much lower fuel pressures than MPI systems. BBD carburetors require only 4-5 PSI fuel pump pressure! The 2.5L TBI normally runs 14-15 PSI. 1991-95 MPI systems operate at 31-39 PSI. Normal pressure for a TJ system is from 49.2 +/- […]

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 – How-to: Fuel-and-Spark Modifications for the Jeep 4.6L Stroker Inline Six

Moses Ludel’s 4WD Mechanix Magazine – How-to: Fuel-and-Spark Modifications for the Jeep 4.6L Stroker Inline Six

Fuel and Spark Needs for Jeep 4.6L Inline Six Stroker Motors! The 4.0L inline six with a hybrid 4.2L crankshaft has become popular—and practical as well! The ease with which this engine can be built makes the “stroker motor” a must for Jeep owners facing an engine rebuild. Jeep’s relationship with the 4.2L/258 and 4.0L inline six-cylinder […]