Question about BMW 325

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When engine warm, on hard acceleration, the engine cuts out for a second at 4,000 rpm; "check engine" light comes on;can you help?

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  • dmcwheat Jul 22, 2009

    It seems the engine is "turned off" when this "cutting out" happens at 4,000 rpm - the tires sometimes 'chirp'as it starts up again. The coil is a simple piece of wiring(a transformer, essentially), so why would it quit at a particular rpm, and why not do it when cold? Car pulls well over 4,000. Any thoughts, please.

  • dmcwheat Jul 23, 2009

    This reply would be correct if the problem just occurred on hard acceleration, but the cut-out only occurs at the very specific 4,000 rpm. Any better ideas? Thanks....

  • dmcwheat Jul 23, 2009

    Any more suggestions? Cold O.K.; hot, cutting out for a second at 4,000rpm; sometimes lurching as the engine cuts in and out;

  • dmcwheat Jul 29, 2009

    Not only does the "Check engine" light come on but also all the other lights as well - as if you have turned the Ignition On but not energised the starter - this lasts for only a second, then engine restarts and will cut out again at about 4,400 rpm. Keep thoughts coming please. Cool engine does not do this at all.

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You need to have this vehicle diagnosed with a computer to fix this.From that you will get some error codes and then once you get the code come back on this site and make sure you don't spend money before taking any advise..As this might prove costly and many people end up changing/buying parts which does not solve their problem.

Posted on Jul 29, 2009

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Most likely it is just a faulty sensor which is most common case when check engine light comes on, you should have codes read by a part store for free. Then you will know exactly what the problem is. It could be any sensor,

Posted on Jul 23, 2009

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Your probably needing a new oxygen sensor.

Posted on Jul 23, 2009

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On hard acceleration meaning there is a demand for high RPM, but the Air:Ggas mixture could not maintain 14.6:1 golden ratio. At that time you have more air than gas, therefore the engine cuts out. At the same time The Oxygen sensor reports the CO mismatch from the look up table in ECM causing the check engine on. Also at a sudden cut out, the pulse frequency of Camshaft sensor was disrupted causing a loss signal to ECM causing the check engine light to come on. If after you restarted, the engine light is still on, then you can take off your Ground cable from battery off for 30 minutes, so the error state can be cleared off itself.
The real problem is that your fuel distribution could not deliver a quick amount of gas to meet the the correct Air:Gas ratio for the demand. Since the Fuel distribution is expensive to replace., Therefore there is a need to to check all the Fuel injectors for clogging after your fuel pump was checked for meeting the correct delivery rate ( quantity in ml per minute). Once this problem is addressed you don't have to worry about Check engine on any more. Good luck on pin point the real root cause.

Posted on Jul 22, 2009

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HI, it is always best to have the vehicles CPU scanned for possible trouble codes when the engine light illuminates during travel. Due to the information you have posted, this leads me to believe that the principal issue here will be within the Ignition coils. the cut out is occurring at a high level of engine rotation. this is , normally attributed to a miss in one or more of the cylinders located within the engine block. there are coils that supply the necessary current needed for proper combustion in each cylinder, via spark plugs. If the ignition coll is damaged or, the coil pack/module is not regulating the current well, this will cause the miss, in return, causing the cut off that you are experiencing at this time during travel.

The best action at this point is to run a diagnostic scan on your vehicle to pull the codes for analysis. this is very important and, needed at this time. i would also advise to have the fuel filter replaced, if not done so already.

Posted on Jul 22, 2009

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