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BMW Piezo Injector Service FAQ's

Posted by Scott Fleenor on

Q: Your ad says you service the index 11 and 12 injectors. Can you service earlier index injectors.

A: Yes, we can and we do so regularly. Although the build quality of the actual injector differs between index numbers, the test plan remains consistent. Earlier index numbers underwent multiple updates to improve construction quality rather than flow rate. However, it is worth noting that we have observed a higher incidence of test plan failures with earlier index injectors compared to index 11 and 12 injectors.

It is very important to note that servicing and testing your injectors does not update them to a higher index. Our testing and servicing process is designed to evaluate and improve the performance of your existing injectors, but it does not include upgrading them to a different index level of internal build quality, with the exception of the updated micro filter that is used during service. If you are interested in upgrading your injectors, we recommend discussing this with our team and considering the benefits and costs of doing so.

Q: Do you rebuild the Piezo injectors?

A: While many refer to our service as "rebuilding" Piezo injectors, we believe the process is more accurately described as "reconditioning." While external serviceable components of the injector are replaced, it is important to note that the VDO Piezo injector cannot be effectively taken apart to replace internal components such as springs, metering valves, spacers, washers, or the Piezo assembly. Therefore, our reconditioning process involves thoroughly cleaning the injector through multiple ultrasonic stations, back flushing it, and installing new micro filters and Teflon compression seals.

Following reconditioning, we initiate a fully automated test plan to ensure that the injector meets OEM flow standards. While we cannot replace certain internal components, we use our expertise and state-of-the-art testing equipment to ensure that the injector is functioning at optimal levels. Overall, our reconditioning process ensures that your Piezo injectors receive the highest quality care and that they perform effectively and reliably.

Q: Can you determine the spray pattern of a high-pressure direct injector during testing?

A: The short answer is yes, but the long answer is no. Let me explain why. The spray pattern of a high-pressure direct injector is more of an explosion than a pattern. During our testing process, we focus more on precise flow measurement than the visual appearance of the spray pattern. Most of our flow testing is conducted without a view chamber for fluid discharge, but with a standard return fixture similar to what you would see on any high-pressure diesel injector flow test bench.

It is also important to note that many shops that test GDI high-pressure injectors on ASNU style low-pressure port injector benches may emphasize the visual appearance of the spray pattern. However, this can be misleading, as accurately testing the flow volume is a crucial factor in ensuring proper injector performance. And accurate volume testing cannot be done when testing the injector at lower operating pressures. At our facility, we prioritize precise flow measurement with proper high pressure test equipment, against an OEM test plan, over visual observation of the spray pattern.

Q: Do you test the injectors before cleaning

A: No, we do not test the injectors before cleaning. Our testing process involves using sophisticated fluid measurement equipment that does not tolerate the presence of contaminants. This equipment is designed to provide highly accurate flow rate measurements, which can be affected by any debris or particles in the fuel system. Therefore, to ensure the accuracy and reliability of our testing results, we prefer to clean the injectors first before proceeding with testing.

It's worth noting that the fluid measurement equipment we use is quite expensive, and any damage or contamination caused by uncleaned injectors could lead to costly repairs or replacement. As a result, we prioritize ensuring the cleanliness of the injectors before testing to protect our equipment and provide the most accurate results possible.

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