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E46 engine misfire
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<blockquote data-quote="jarance" data-source="post: 720476" data-attributes="member: 21"><p>If you hear the pump just before starting, it means either there is leak somewhere. The fuel rail is suppose to hold the fuel pressure at 3.5 bar when the engine is stopped. Usually the leak is at the fuel pump outlet check valve. Petrol will be forced back through the check valve. You may have some problem starting in the morning after leaving the car overnight. (Like a few extra crank).</p><p></p><p>There is a simple way to check the fuel pump.</p><p>1. Press the odometer reset button and turn the ignition to position.</p><p>2. You will see a "Test Display". Press the odometer button many time until it come to "19.0"</p><p>3. Pause for a few seconds and then when the display change to "1.0", press the odometer button until it display "6.0"</p><p>4. The display will then display "123220". The first 3 digits show the fuel on the left tank and last 3 digits show the fuel on the right tank.</p><p></p><p>Note : Do this test when the tank is half full. If it full, the display will show 240330.</p><p></p><p>5. Start the engine and drive around. Observe the display. The first 3 digit on the left show gradually decrease to 000</p><p>and the right 3 digits should increase.</p><p></p><p>This test will prove the strength of the pump. If the pump is good, then the return fuel from the fuel regulator will return</p><p>back to the left fuel tank. it will pass thru the fuel jet pump and will suck the fuel from the left tank and transfer it to the</p><p>right tank where the fuel pump is located.</p><p></p><p>Recently, I have problem starting in the morning and also some error code on misfiring on #4 cylinder.</p><p></p><p>I did the above test and found that there always some fuel in the left tank at 1/4 tank. Sometime my car also stalled at 1/4 tank</p><p>but it is OK at full tank.</p><p></p><p>I bought a new fuel/sender from BA for RM350 and install it myself. So far in the car for a few weeks and the problem of hesitate</p><p>cold starting is no longer encounter. BTW, I also change my fuel filter as well.</p></blockquote><p></p>
[QUOTE="jarance, post: 720476, member: 21"] If you hear the pump just before starting, it means either there is leak somewhere. The fuel rail is suppose to hold the fuel pressure at 3.5 bar when the engine is stopped. Usually the leak is at the fuel pump outlet check valve. Petrol will be forced back through the check valve. You may have some problem starting in the morning after leaving the car overnight. (Like a few extra crank). There is a simple way to check the fuel pump. 1. Press the odometer reset button and turn the ignition to position. 2. You will see a "Test Display". Press the odometer button many time until it come to "19.0" 3. Pause for a few seconds and then when the display change to "1.0", press the odometer button until it display "6.0" 4. The display will then display "123220". The first 3 digits show the fuel on the left tank and last 3 digits show the fuel on the right tank. Note : Do this test when the tank is half full. If it full, the display will show 240330. 5. Start the engine and drive around. Observe the display. The first 3 digit on the left show gradually decrease to 000 and the right 3 digits should increase. This test will prove the strength of the pump. If the pump is good, then the return fuel from the fuel regulator will return back to the left fuel tank. it will pass thru the fuel jet pump and will suck the fuel from the left tank and transfer it to the right tank where the fuel pump is located. Recently, I have problem starting in the morning and also some error code on misfiring on #4 cylinder. I did the above test and found that there always some fuel in the left tank at 1/4 tank. Sometime my car also stalled at 1/4 tank but it is OK at full tank. I bought a new fuel/sender from BA for RM350 and install it myself. So far in the car for a few weeks and the problem of hesitate cold starting is no longer encounter. BTW, I also change my fuel filter as well. [/QUOTE]
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