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Based on Illinois Environmental Protection Agency data test, the most common trouble codes that cause an OBD II plug-in emissions test failed on many vehicles and make the Check Engine light on would be fouled or a worn out catalytic converter. More common trouble codes that cause vehicles fail on emissions test and make the Check Engine light coming on can found below. Description Percentage Trouble Code Coolant Thermostat 3.1% P0128 Oxygen (O2) Sensor Slow Response Bank 1, Sensor 1 …

Read Diagnose Engine Misfire (Part 2) IGNITION AND COMPRESSION MISFIRES Once you remove the spark plug, in case you also have isolated it to a single cylinder and have a misfire, the cause will be obvious. If the insulator of the plug is broken or cracked, then you have found the issue. Check for plug boots and wire damage, if the plug is wet but appears to be OK. End to end, using ohmmeter to measure the resistance of plug …

Read previous Diagnose Engine Misfire (Part 1) FINDING THE CAUSE OF A STEADY OR CONTINUOUS MISFIRE The first step to do in diagnosing the steady misfire problem is to isolate the misfiring cylinder. While the engine is idle, one at a time disconnect each of the spark plug wires temporarily, this is an old-fashioned way to find a weak cylinder, although this is an old-fashioned way but sometimes it working. The weak cylinder has been pinpointed if there is no …

Read Diagnose Fuel Pump (Part 2) : Fuel Pressure Test Fuel System Scan Tool Checks Look on a fuel pressure PID, if your scan tool can display OBD system data. Compare the specifications against the fuel pressure reading if it’s within range or not. To see if the result is the same, also compare the actual reading on the vehicle with a gauge with the scan tool pressure reading. Fuel pressure sensor is bad if the gauge reads higher. The …

To read Diagnose Fuel Pump (Part 1), click here. Residual Fuel Pressure Test For a period time (several minutes) residual pressure will be held by a system when the pump is stop running or turned off. Check the manual how much allowed pressure drop on this given period of time. When pressure drops so quickly, there a leaky fuel pressure regulator on vehicle, leaky fuel line, one or more fuel injectors leaks, or a leaky fuel pump check valve. On …

When the engine is not start or running properly, it is likely that the fuel pump does not provide sufficient fuel pressure and fuel volume to the engine. Some problems will occurs if the fuel pressure is low, it can cause hesitation and stalling, a rough idle, hard starting, or misfiring. Engine won’t starting when no fuel pressure, or when fuel pump fails, it may cause the engine to quit while you are driving. The sensitivity of the fuel injected …

It can be annoying when we get the vehicle engine stalls very often. And for no apparent reason it can happen while you are driving. Temperature related is most thing causing the stalling problems, especially on cold weather it can happen often, it also can happen when the engine started on cold. After Starting The Engine Stalls (Cold Quickly) The engine had too much air and not enough getting fuel is common cause the engine stalling. To start the cold …

Depending on the cause, a common driveability issue is a misfire that is not easily to diagnosed. It is hard to miss if a misfiring cylinder is in a four-cylinder engine. It’s like a horse that trying to run on three legs if the engine losing a power output about 25%. At idle engine might be shake and and the engine vibrations can be felt throughout the vehicle and in the steering wheel. Engine might stall at idle or hard …

The Check Engine Light (that’s the MIL or Malfunction Indicator Lamp) notifies you if an emissions-related issue happens with the emission controls or engine control system on your vehicle. Depending on existing issue, the Check Engine Light will remain on repeatedly or flash and may appear on. Several intermittent problems could make the Check Engine Light on only when the problem is happening (for example engine misfire). The Check Engine light commonly stays on when a fault has been detected …

The purpose of the anti-theft system is to prevent car theft. Most anti-theft system that available on market is working good and reliable. However, when the anti-theft system act up, it can caused many issue and so annoying. Your car won’t start, or it can causing the engine to stall, or while you are driving the system can killing the ignition right away. And without apparent reason the alarm will go off, or when you don’t shut off after open …