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Misfire

A few different components could be causing your issue. Your symptoms sound at first like a spark issue. If a plug was tightened down too hard, the gap can become smaller than intended. This would decrease the power of the...

If the plugs and coils are in good shape, that leaves fuel system or vacuum leaks. It is probably too early in your car's life to expect internal malfunctions. Look under the hood for any hoses or rubber boots that...

It is usually best to change all the coils when chasing a misfire with engines of this age and mileage. If one is weak, they are likely all weak. When you changed the plugs, was there oil in the spark...

The fuel injectors on this engine can intermittent stick causing a misfire. The fix is to replace the injector for the cylinder having the problem. This is from a carbon build up in the injector pintle. I would recommend having...

Hi there. Most of the time, this is caused by a dirty throttle body (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-throttle-body). If there is build up in the throttle body bore, then the throttle plate will have trouble racing the correct location keeping the engine from...

Hello. I would need to know which misfire codes you are getting to know for sure what is going on. Most of the time on this vehicle if it is a single cylinder misfire then it may be as simple...

You may have defective ignition module or distributor pip sensor. I would suggest having a mechanic like one from YourMechanic check the problem for you or you can start by replacing the ignition module and see if it helps? You...

The "apparent" oil pressure switch malfunction is not a cause of the stalling or misfiring. That malfunction with the switch has to be diagnosed and confirmed because sometimes there is nothing wrong with the switch itself but rather there is...

Hello there. Many common faults could cause your vehicle to have a cylinder #2 misfire. The most common faults are the spark plugs (https://www.yourmechanic.com/services/spark-plugs-replacement), spark plug wires (https://www.yourmechanic.com/services/ignition-cable-spark-plug-wires-replacement), coil (https://www.yourmechanic.com/services/ignition-coil-replacement), fuel injector (https://www.yourmechanic.com/services/fuel-injector-replacement), a vacuum leak, or low compression in...

The DME is a possible failure for the misfire for your 2002 BMW M3. A complete pinpoint test for the codes would need to be done to rule out anything like coils (https://www.yourmechanic.com/services/ignition-coil-replacement) or plugs (https://www.yourmechanic.com/services/spark-plugs-replacement). Your shop replaced the...

You were probably right to change the plugs and coils, they needed to be ruled out. But since you're not getting codes for a specific cylinder, your problem is probably a little more subtle. You might be having a problem...

The oil light comes on when the oil pressure drops below a certain level: usually about 8 psi. Since the oil pressure will depend to some degree on how fast the oil pump is turning, you are probably seeing it...

Engine misfires can be caused by a list of problems, but there are a few suspects that occur more than others. Generally, misfires are caused by either a spark or fuel issue, or in some cases a combination of both....

Hi, thanks for writing in. There are many things that could cause a misfire (https://www.yourmechanic.com/article/how-can-problems-with-the-ignition-system-cause-misfiring_2), such as faulty spark plugs (https://www.yourmechanic.com/article/symptoms-of-bad-or-failing-spark-plugs), a bad coil pack (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-ignition-coil), bad injectors (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-fuel-injector), a faulty crank position sensor (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-crankshaft-position-sensor) or something else. I would...

Since the check engine light came on you will want to have a computer scan for stored codes. This may indicate the cylinder that is misfiring or having issues and then further diagnosis on that cylinder can be done to...

Hello. There are several possibilities that could explain why you are having this problem. One possibility is that you could have one or more faulty fuel injectors (https://www.yourmechanic.com/services/fuel-injector-replacement), or the fuel injector wiring is damaged. Another possibility is that one...

If your car has not had a major service that has involved replacing spark plugs and all the filters that might be all that you need. Mercedes recommends replacing the plugs at 100 k but I prefer to do it...

Hi there. Check the injectors on the throttle body and see if they have a metered spray. If the injectors are spraying correctly, then there is a vacuum leak on the engine and is only effective when under a load...

Hello. the Diagnostic Trouble Codes would have to be retrieved to begin the diagnosis. Unless the shop retrieved all codes and performed a diagnosis and tested the coils (there are six of them on your engine), what they have told...

Hello. Engine detonation and power loss can be caused by a few different things. Keep in mind that engine detonation can quickly become a bigger issue if left unchecked, and in serious cases can even lead to engine damage. It...