When engine is old, single pattern of one cylinder shows there is a fault in the system, but if all cylinders are similar, this engine should be fine, maybe just worn and aging.Ĭyl 1: Firing Voltage = 6.4kv Burn Time =1.39msĬyl 2: Firing Voltage = 5.2kv Burn Time =1.32msĬyl 3: Firing Voltage = 6.2kv Burn Time =1.19msĬyl 4: Firing Voltage = 6.1kv Burn Time =1.45msĬyl 1: Firing Voltage = 9.8kv Burn Time =1.15msĬyl 2: Firing Voltage = 8.4kv Burn Time =0.84msĬyl 3: Firing Voltage = 9.9kv Burn Time =0.84msĬyl 4: Firing Voltage = 9.0kv Burn Time =1.
While fuel trim diagnosis is a learned skill all by itself, we can note a few generalities.
Check and record fuel trims at idle, at 2,500 rpm and at cruise speed. Raster or stacked display can let us compare all cylinders. A basic step in driveability diagnosis is to check the fuel trims both short term and long term under different conditions. Through a wide range of innovative products, including injector test benches for Diesel and Gasoline injection systems, Engine service equipment and tools. We need accurate testing to find out fault in the area. The pattern can help us to diagnosis the fault in the ignition system, but it just gives us the direction of the faulty area. Large spark plug gap or high resistance in the circuit may cause this problem. WS3 - Oscilloscope Patterns to CaptureThe reading is not normal.
