BMW 3 Series model year 2007: Symptoms and solutions for mixture control errors

Hello everyone, I am currently having problems with my BMW 3 Series, built in 2007, with a gasoline engine. Somehow it's not running as smoothly as usual. Observed some symptoms such as black smoke from the exhaust when accelerating, the check engine light is on, longer cold start time, loss of power, jerking when accelerating, poor fuel economy and strong exhaust odor. There may be a fault in the mixture control and the mixture is too lean. I would like to hear your opinions and experiences on this subject. I am particularly interested in how you have solved this in the workshop and what experiences you have had there. Any tips are very welcome! Many thanks in advance!

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19 comment(s)

Hi, I had a similar problem with my 2005 BMW 1 series, I am not a car expert but have some experience with cars. I took it to the garage where they diagnosed a faulty injector. The repair cost me 515 euros. Since then, the car has been running like new again. Can you perhaps provide some more information about your vehicle? Mileage, maintenance history, etc. could be helpful to give you more specific advice. Good luck with your repair!

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Hey, thanks for your quick reply! My BMW now has 221478 km on the clock and is basically still running quite well. There were no major abnormalities at the last service. I'll definitely check your fuel injector on mine too. Thanks for the tip! Best regards

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Hello, I'm glad to hear that your BMW is still running well! Such a high mileage on the odometer and still so reliable, that speaks for the quality of BMW. Regarding the problem: I would definitely take a look at the fuel injectors. The lean mixture could be caused by a defective injector. I would also recommend having the error code read out. The engine control light indicates that something is wrong. Perhaps the error code also gives an indication of the problem. If you have any further questions or need help, please let me know! Good luck with your troubleshooting! Best regards!

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Hey, many thanks for your valuable tips! I will definitely have the injectors checked and have the error code read out. Let's see what comes out of it. I'll keep you up to date. Thanks again for your help and support. Your advice was really helpful! Best regards!

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I don't know what the problem is, so the RPM fluctuates when cold and the battery only gives 8-9 V until the car is warm, then everything is as if forgotten.

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Quotation:
@Luchas13669 wrote on
I don't know what the problem is, so the RPM fluctuates when cold and the battery only gives 8-9 V until the car is warm, then everything is as if forgotten.

It sounds like you might have an issue with your battery or alternator. A healthy battery should read around 12.6 volts when the engine is off. When the engine is running, this reading should be between 13.7 to 14.7 volts. I'd suggest you to start by checking the battery voltage when the engine is off and when it's running. If the voltage is low, it might be time to replace the battery. If the battery is fine, then the alternator might be the issue. Please update us on your progress.

Hello, for some time I have several error codes recurring (fuel air mixture too lean, gap too high) on my 2016 BMW 1 Series 118i LCI. I have already changed spark plug + coil and the car has -100k km. Would you have a clue to help me in my troubleshooting because an engine light sometimes appears (not permanently) in cold or wet weather. Thanks in advance Have a nice day!

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Quotation:
@LucTDW wrote on
Hello, for some time I have several error codes recurring (fuel air mixture too lean, gap too high) on my 2016 BMW 1 Series 118i LCI. I have already changed spark plug + coil and the car has -100k km. Would you have a clue to help me in my troubleshooting because an engine light sometimes appears (not permanently) in cold or wet weather. Thanks in advance Have a nice day!

Hi, the error codes you're getting suggest that there might be a vacuum leak or a problem with the Mass Air Flow (MAF) sensor. Start by checking for any obvious signs of vacuum leaks such as hissing sounds, cracked or loose hoses. If you don't find any, you might want to consider having a smoke test done to detect any hidden leaks. If there are no leaks, the MAF sensor might be the issue. It can be cleaned with a special cleaner available at auto parts stores. If cleaning doesn't help, it might need to be replaced. Please keep us updated on your progress.

Hello engine light on I used the Carly diagnostic (poor air fuel mixture) what does it mean?

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Quotation:
@Shayan wrote on
Hello engine light on I used the Carly diagnostic (poor air fuel mixture) what does it mean?

Hi, a "poor air fuel mixture" code typically means that your engine isn't getting the right ratio of air and fuel. This could be due to a variety of issues such as a faulty oxygen sensor, a leaking fuel injector, a dirty or failing Mass Air Flow (MAF) sensor, or even a vacuum leak. I'd suggest starting with the easiest checks first - inspect the condition of your air filter and clean or replace it if necessary. Then, check for any visible signs of vacuum leaks. If these checks don't resolve the issue, you might need to have a professional mechanic diagnose the problem. Please keep us updated on your progress.

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