IrvesBMW Posted June 5 Share Posted June 5 I am experiencing a problem with my X5 where there is a noticeable decrease in power starting from about 2500rpm. However, when I stop the vehicle and restart it, the issue seems to be resolved. There is no error message log (EML) shown on the dashboard and no information is being shown on the diagnostics. My hypothesis is that the lack of power transfer from the small side turbo to the large turbo is due to a vacuum issue. The small side turbo is equipped with an electronic actuator, which provides initial power. However, when the power is supposed to move to the big turbo, there is no power until the engine is restarted. Currently, I am required to start the vehicle twice before driving, which may have a detrimental impact on the battery. Has anybody encountered this problem before, or am I just experiencing unfortunate circumstances? If there are no diagnostic clues, finding the cause is as difficult as finding a needle in a haystack. Assistance urgently needed. Quote Link to comment Share on other sites More sharing options...
WiseSage Posted June 5 Share Posted June 5 I would inspect the intake and remove any accumulated soot and oil residue. Quote Link to comment Share on other sites More sharing options...
WiseSage Posted June 5 Share Posted June 5 Quote Link to comment Share on other sites More sharing options...
IrvesBMW Posted June 5 Author Share Posted June 5 Thank you for your response. Over the weekend, I thoroughly cleaned the mentioned components, including removing the intake and swirl flaps. Nevertheless, the problem has persisted for around three months. Quote Link to comment Share on other sites More sharing options...
TDudette Posted June 5 Share Posted June 5 What scanning method did you use, since general methods might overlook or provide deceptive results. Given that the issue is resolved by turning the device off and on, it indicates a potential electrical problem, maybe related to the turbo Variable Nozzle Turbine (VNT). Quote Link to comment Share on other sites More sharing options...
IrvesBMW Posted June 5 Author Share Posted June 5 Thank you for your response. I had my vehicle thoroughly examined using comprehensive diagnostic procedures, since I have a buddy who is a professional mechanic. I am now experiencing issues with the turbo-related electrical system. Specifically, the problem occurs when the system is turned off and then back on again. However, when the start-stop feature is on and the vehicle pauses at a set of lights before starting again, the issue reoccurs. Quote Link to comment Share on other sites More sharing options...
TDudette Posted June 5 Share Posted June 5 Which diagnostic method was employed? I believe that ista is the optimal toolkit for doing investigations. Quote Link to comment Share on other sites More sharing options...
CodeCrusader Posted June 5 Share Posted June 5 Even high-quality snap-on scanners might provide inaccurate information. You must use a BMW diagnostic kit to scan it. Quote Link to comment Share on other sites More sharing options...
IrvesBMW Posted June 5 Author Share Posted June 5 Thank you for your response. I believe it is necessary to scan it with ISTA, as you have suggested. Is there anybody in close proximity to Worcester who would be willing to examine it on my behalf? Thank you once again for the responses. Quote Link to comment Share on other sites More sharing options...
WordSmith Posted June 5 Share Posted June 5 Is it always remapped? Quote Link to comment Share on other sites More sharing options...
IrvesBMW Posted June 5 Author Share Posted June 5 The remapping process has not been carried out yet. I intended to have it done after removing the problematic swirl flaps. However, I am aware that I need to address this issue before considering the remapping procedure. Thank you. Quote Link to comment Share on other sites More sharing options...
WordSmith Posted June 5 Share Posted June 5 Any reputable tuner would not do mapping on a vehicle with existing flaws. If they do, they are unprofessional and inexperienced.What is your location? Quote Link to comment Share on other sites More sharing options...
IrvesBMW Posted June 5 Author Share Posted June 5 I am located in Worcester. Thank you. Quote Link to comment Share on other sites More sharing options...
WordSmith Posted June 5 Share Posted June 5 Not too far from Middlesex, then.Please get this message to Jason @ BWchiptune if possible. I have his contact information, which can be easily obtained from his Facebook or website. Many others on this platform can confirm his credibility. Despite being 400 miles distant, I have personally used his services many times. Quote Link to comment Share on other sites More sharing options...
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