This was fun. I thought my car was done with that rough idle! Thank god for that diagnostic tool!Not sure which ignition coil to get? Check out realoem.com a Typically spark plugs should be replaced on stock N20s every 40,000 – 50,000 miles, and ignition coils every 50,000 – 60,000 miles. However, a tune and bolt-ons cut the life of these parts in half, roughly. If you know you have not replaced the N20 spark plugs or coils within the recommended time it may be a good idea to do so before tuning Don’t forget to replace the spark plugs and spark plug tubes when you do this service. It’s a good idea to go ahead and do the valve cover gaskets, coils, and plugs at the same time for the best results when you do your BMW oil service. Throttle Body Actuators. This is one of the two real problems that cripple S65 engines on a regular basis. Spark Plugs: $65-89 DIY, $120+ at an independent repair shop. Ignition Coils: $159 DIY, $250+ at a repair shop. BUY BMW N20 IGNITION COILS HERE. BUY BMW N20 SPARK PLUGS HERE. 2. BMW N20 Engine Oil. Although it is obvious engine oil must be changed as a part of standard maintenance, it is relatively unclear how often. Overview of Essential BMW 320i Maintenance Needs. Head to your nearest Firestone Complete Auto Care in your 2014 BMW 320i for factory-recommended routine maintenance and our technicians will jump right in with a Courtesy Check. A Courtesy Check helps "set the stage" for your service and catch any small problems before they turn into big repairs. Remove the oil cap and hold onto it for a few minutes. There will be two 10mm screws that hold down the left engine cover. You’ll need to remove this cover and set it to the side before replacing the oil cap. Now you’re ready to remove the coils on top of the spark plugs. MSRP Price: 28.33. BW Part #: 12120039664.BMW. Brand: Genuine BMW. (In Stock) Description. Customer Reviews. Copper tip core with iridium coating has excellent conductivity with low wear. Colder heat range for high performance and track use. Original Equipment for N20 engines as well as M4 GT4 and M6 GT3. The most common signs of bad spark plugs in BMW 3 Series are poor acceleration or hesitation, rough idle, engine misfires, poor fuel economy, check engine light illuminates, engine knocking noise, and sometimes hard starting. In worst case scenario, if the spark plugs are in really bad condition, the engine will not start. A single coil would provide the spark power for the entire engine (or sometimes two coils for larger "V" engines). The canister-style ignition coil remained in regular production use right up to the 1990s. In the early 1990s BMW switched from the canister-style ignition coil with spark plug wires to a "coil on plug" direct ignition system. k7GFLgn.

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