1JZ Flooding with Fuel - Bad ECU Capacitors and Corroded Injector Grounds

Electricalintermediate✓ OP Confirmed

Problem

1JZ-GTE engine began misfiring while cruising on the highway, progressively worsened to running on approximately 4 cylinders, then died completely. Upon inspection, cylinders 2-6 were flooded with raw fuel. After clearing the fuel and installing new plugs and coil packs, the engine would crank but not start, and cylinders 2-6 would immediately flood with fuel again.

Misfiring while cruising at highway speedProgressive cylinder dropout (sounded like running on 4 cylinders)Engine stalled and would not restartLoud click sound when attempting to start (starter solenoid engaging but engine hydrolocked with fuel)Cylinders 2-6 flooded with raw fuelRepeated fuel flooding after clearing cylinders

Root Cause

Failed/leaking capacitors in the ECU caused the ECU to malfunction, resulting in the injectors being held open and flooding cylinders with fuel. A secondary contributing factor was corroded injector ground connections on the intake manifold, which caused low voltage at injector outputs and continued fuel dumping in specific cylinders (3 and 5) even after the ECU cap repair.

Confidence

Moderate confidence — Original poster confirmed this resolved the issue

View Original Thread →Posted June 2011 on SupraForums.com