Exhaust Back Pressure Test and Check Manifold Vacuum
How To Test Exhaust Back Pressure
- Removed O2 sensor and screw gauge and adapter into sensor hole. Started truck.
- Accelerate the engine to 2500r/min, if gauge read less than13.8 Kpa pressure, showing no blockage.
- If greater than 13.8 Kpa, means have blockage.
How To Check Manifold Vacuum
Use this vacuum gauge measure the manifold vacuum pressure, helped you troubleshoot the system and find the failed component.
- Start the engine and warm up the engine temperature to between 75-85 degrees, turn off the engine.
- Connect vacuum gauge, Started let the engine run in idling conditions, and ensure the speed is around 850r/min.
- If guage read less than 53Kpa, indicates that the system has a leak.
Welcome to the high-precision auto repair vacuum gauge, Long press the left button of the watch is the power switch. Short press the left button in the power-on state to adjust the pressure unit. When measuring the pressure that fluctuates too fast, long press the right button for 3 seconds and the screen will display AL, and the pressure value will be sampled for 5 seconds. The sampling end screen Return to the normal measurement mode, at this time, short press the right button to observe the maximum, minimum and average pressures. It will automatically shut down if there is no operation for 30 seconds. The tapered metal head in the meter box is connected to the vacuum tube to detect the vacuum pressure of the intake manifold. The black rubber head is connected to the hole of the oil gauge to judge the quality of the exhaust valve by detecting the pressure value of the crankshaft ventilation box. The metal stepped head is connected to the front oxygen sensor. The position is used to test the exhaust back pressure. 1. Fault diagnosis of intake manifold negative pressure [You can connect to the mobile APP via Bluetooth or press and hold the right button for 3 seconds for sampling analysis] engine idle speed 50-70kpa allow 3kpa deviation normal 40-60kpa slow jump, poor valve seal 47-53kpa fast jump valve guide stuck 50-53kpa slow jump valve guide damage 30-60kpa jumps sharply, cylinder head blow-by gas 40-60kpa irregular jump, the mixture is too lean or too rich 47-54kpa slow jump Spark plug gap is too large 47-57kpa no jump, ignition too late 27-50kpa no jump, valve opening lag 33-53kpa Irregular jump, intake pipe leakage Lightly step on the accelerator and the engine stabilizes at 2000 rpm 33-74kpa fast jump valve spring failure Engine 2000 rpm release throttle When the pressure drops from 83kpa to below 6kpa instantaneously, the three-way catalyst is blocked. Stepping on the accelerator engine from 2000 rpm to 3000 rpm vacuum pressure drop also indicates that the three-way catalytic blockage 2. Standard pressure of waste gas valve [short press the left button to adjust the unit to mbar] EA888 code 06H-103-495-AB pressure reference 25MBAR Applicable models Passat, Tiguan, Golf, Sagitar, Magotan, Haorui EA888 code 06H-103-495-AH pressure parameter 25MBAR Applicable models Passat, Tiguan, Golf, Sagitar, Magotan, Haorui EA888 code 06H-103-495-AF pressure reference 100MBAR Applicable models Audi Q3A5 A4 Q5 A61.8T 2.0T EA211(-20-50mbar) EA888 three generations (-80-100mbar) EA888 second generation 1.8T(-30mbar) EA888 second generation 2.0T (-80-100mbar) EA837 3.0T (-130 ± 15mbar) EA824 4.0T(-13015) C7 2.5(-100mbar) C6 2.4 (-125 ± 15mbar) 3. Three-way catalytic or particle catcher clogging judgment Remove the front oxygen sensor, select a suitable connector to connect to the hole, Note that due to the high exhaust temperature, the measurement time should not be too long The engine speed is 2500 rpm, and the pressure value exceeds 13.8kpa, indicating that the exhaust is blocked