Question about 2008 BMW 528i Sedan

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1998 bmw 528i severe misfire

Its a 1999 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 .

HELP

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  • mcgowanmicha May 06, 2009

    thank's guys very helpfull the engine runs sound better than ever,



    **** / ireland .

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  • 32 Answers

If you've never replaced the timing belt or chain,That would be my first thing I'd check is the Timing belt or chai, just aline the timing marks on crankshaft and then look at the position on the distributor to see if it's pointed in the #1 firing position .

Posted on May 02, 2009

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Posted on Jan 02, 2017

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Manolito64

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SOURCE: its a 1998 528i bmw

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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