A couple of factors make the E46 important; besides its exquisite design, the E46 revived BMW's reputation in making reliable cars. The previous model, the
BMW E46 M3 Common Suspension Problems. The E46 M3 indeed has some of the best chassis dynamics of all sports cars from that era. It regularly punched above its price point to deliver a sublime driver-oriented performance. However, some significant problems began to develop as the M3 got up in age. One of the more common causes of a BMW E46 3 series not starting, having difficulty starting, or running poorly is a faulty fuel pump. Unfortunately, a problem with the electrical supply to the pump can often be misdiagnosed as an issue with the pump itself.

Multiple random electrical issues is a common sign of a battery that is nearing the end of its useful life. I'd start by getting it tested at one of those free joints like autozone (if you don't have a voltmeter or a good local shop). - Jake . . 2004 325Ci - 5MT - SOLD & MISSED. 2003 3.0 Z4 - 6MT - SOLD TO HAIRDRESSER.

Quick suggestion, if you car is running poorly now that the weather is cold, replace at least the lower intake elbow, the DISA O-ring and the CCV lower oil return hose, clear the DME codes, about $50. Then worry about other things if the car is still running poorly or has additional CEL/MIL codes. The BMW M3 is a true BMW enthusiast's must-have. I bought this car at 90k miles and have driven it 30k more without many major issues - just one dead gas pedal which cost me ($120, 5 mins to m8Oi8.
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