Question about 1990 BMW 5 Series

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Bmw 525i (1990) intermitent ignition prob

My work involves a lot of door knocking ,so a lot of short (very short/next street) trips.
When i start in the morning the car starts up fine i drive 10/15 miles no prob firing on all cylinders . start work (short trips ) problem starts sometimes it will start fine but a lot of the time it will fire on 3/4or 5 cylinders only .the only cure i have at mo is to stop turn off and remove the key then try again .
i have changed all plugs ,ht leads.roter arm, distriburtor cap .
please help

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  • Jack Iaria
    Jack Iaria May 11, 2010

    How many miles?

    It may be as simple as a dirty fuel system especially if your running your gas tank down to empty a lot and not using a fuel injector additive regularly.

    Try a can of $10 Total Fuel System Cleaner!



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  • Master
  • 409 Answers

Install hotter plugs and run it harder between stops. Also check your fuel pressure regulator.

Posted on Feb 15, 2009

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