Question about 2008 BMW 528i Sedan

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Its a 1998 528i bmw that will start but wont stay running also there is a loud kind of backfire noise from one of the cylinders . the engine wont rev up proper even though i keep pressing the throttle and eventually just dies until i start it again .

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The fact that you have a backfire noise that you can trace to just one cylinder makes it sound like a spark plug could be loose or broken. Pull out your spark plugs and examine them. On a '98, that eill mean pulling off the plastic cover, then removing the coils (need a 10mm socket, be careful with the ground wires) and then reach down in with a small spark plug socket on a long extension.
Also, look for a massive air leak on the intake. Take apart the air tubes from the air filter up to the throttle body looking for air leaks. You could also have a leak at the intake manifold gasket but you may need help to check for that.

Posted on Mar 25, 2011

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