Misfire is due to a faulty coilpack or bad wire or connection. the drain on your system is another issue. youll have to chase it down with a voltmeter
Testimonial: "Well the misfire i took the coil and plug off to check the voltage on it and it measured the same as the rest but when i took the spark plug out their was a crack so i replaced all the spark plugs and the check engine dissapeard thanks"
SOURCE: battery drains in my 1984 BMW 318i
I have the same car I had the same problem.If you have the correct battery for your car with the same problem you have a short or positive ground in your dash/electric fuel pump/fuse box also be carefull of how you take the key from the ignition and if they're old replace them.
SOURCE: Subaru Electrical Gremlins
turn head light on and try to start car if they dim way down replace battery or connect a volt meter to bat check voltage while cranking. it must be 12 volts or higher.
SOURCE: Battery on BMW 740i keeps dieing
you need to disconnect one side of the battery, put one lead from an ampmeter on the battery post you have disconnected and the other ampmeter lead on the cable you took off the battery. with nothing turned on on the car , all doors closed the reading on the ampmeter should be no higher than 0.17 amp, if it reads a lot hgher go to the fusebox and remove one by one all the permanent supply fuses looking at the reading every time until you find the circuit that is causing the high reading, this will be the drain. alot of the time it can be central locking system playing up, boot light, glove box light not switching off, stereo wired wrong. hope this helps.
SOURCE: 2002 Ford F150 Supercrew - Electrical problem! Help!
dk mak r
As a retired electrical engineer this intrigues me. If you were my neighbor I would put an ammeter in series with the batteery lead to see just how much current is being drawn by the "mystery" load.
When you disconnect or hook up the battery can you see any sparks when the cable touches the battery terminal?
If the battery can get run down over night that is a significant drain.
If there is some sign of spark when you connect/disconnect the battery lead try the following.
Selectively remove a fuse in the fuse panel, (starting with the larger fuses, 15A, 20A) and then connect the battery terminal and see if you still have a spark.
Hope this helps Good luck Loringh
SOURCE: 2000 BMW 740i starting/battery problem. Battery
I am having the same problem same car & year
did you ever find a solution?
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Ok thanks for the advice ill will try to diagnose the problem using the ampmeter.
Oh just now when i started my car the check engine light came on and gave me a code p0302 cylinder 2 misfire, where is cylinder two located at the driver side cylinder head or the passanger side?
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