Oceanside Auto Repair

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Bad Ignition Coil Symptoms | BMW Issues Carlsbad CA

Bad Ignition Coil Symptoms | BMW Issues Carlsbad CA

Recently this 2007 BMW 328i came into our shop  from Carlsbad CA. that had it’s check engine light illuminated accompanied by a rough idle and a misfire. After looking throughout the car during our courtesy inspection we proceeded to test the voltage on each ignition coil. In order to complete this we used our ignition voltage checking device and checked the firing voltage of each ignition coil one at a time.   When completing our test we found that all of the coils were working properly except for one. Typically we will see the voltage change on each coil as we are testing them individually, however the voltage should not fluctuate too drastically on each one usually ranging from 9 volts to 12 volts.  On the remaining coil that tested bad, we noticed the voltage jumping from around 9 volts, up to 25 volts, down to zero volts, and so on. This was an immediate red flag for us and upon further ... read more

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343 Airport Rd. Oceanside, CA 92058 (760) 721-5500