coolguy Posted August 7 Share Posted August 7 Greetings! I just purchased an Audi S5 B8, which consistently displays illuminated EPC and traction control lights without any intermittent flashing. The engine has frequent misfires and sometimes fails to accelerate at traffic lights. The vehicle experiences severe vibrations and despite applying maximum pressure on the accelerator, there is no increase in power output.After a few hesitant revolutions, it suddenly accelerates forcefully. I replaced all of the spark plugs due to their deteriorated condition, as I believed they were the likely culprit. The coil pack underwent testing and was found to be in proper working condition. However, it was seen that some of the coil pack connections are damaged. To ensure that there is no loose coil connection, I secured the broken connectors using zip ties. The occurrence of misfiring in the automobile persists, resulting in a severely compromised driving experience. If you have had the similar problem, do inform me of the specific aspects I should investigate. The mechanics here use a strategy of replacing each individual element in order to identify the source of the problem. I suspect the occurrence of a vacuum leak or brake booster leak, which may sometimes happen after prolonged acceleration, such as at traffic stops. Quote Link to comment Share on other sites More sharing options...
SD1too Posted August 7 Share Posted August 7 If you are unable to troubleshoot and identify the issue yourself via trial and error, you will need to entrust it to the technician. Prior to anything else, it is crucial that you acquire a scan tool to accurately guide you towards the first area to investigate. Subsequently, if you choose not to progress with the investigation alone, you should communicate the findings to a technician. Finally, do you own the aluminium intake manifold or the plastic variant? Quote Link to comment Share on other sites More sharing options...
coolguy Posted August 7 Author Share Posted August 7 Although I sought the assistance of a technician, he was unable to identify the root cause of the misfire. It is worth noting that in Morocco, where these engines are not widely used, it is uncommon to find a mechanic with expertise in Audi V8s. After doing a diagnostic, it has been determined that there is a misfiring issue in all of the cylinders. Could the aluminium manifold be correlated? Quote Link to comment Share on other sites More sharing options...
rab60bit88 Posted August 7 Share Posted August 7 If you want to make a wise investment in a reliable scan tool, I highly recommend considering Ross-Tech: Home. They provide the only instrument that is really effective, and they provide worldwide shipping. These individuals have successfully deciphered the VAG codes, making these VCDS scanners on par with the original factory equipment. The faults can only be identified by doing a thorough scan of the automobile. Otherwise, you will waste a significant amount of money by replacing components unnecessarily. Quote Link to comment Share on other sites More sharing options...
coolguy Posted August 7 Author Share Posted August 7 Greetings! Indeed, I will get my own scan gear in the near future. I appreciate your advice. I have conducted a scan which indicates that there is a problem with the intake manifold runner control solenoid being stuck in the open position. This defect is directly linked to the misfire, decreased fuel efficiency, and reduced power output at low engine speeds. These are the findings of the scan. The previous owner used an incompetent technician, resulting in several missing connections. However, the primary shortcomings are: P0100 The code is P0368. The code P2539 P2005 P2014 I conducted much research, but I would really appreciate any assistance with these codes. Quote Link to comment Share on other sites More sharing options...
rab60bit88 Posted August 7 Share Posted August 7 Retrieve information by doing a search using the Google search engine. These items can certainly be found... Quote Link to comment Share on other sites More sharing options...
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