gaethzac000 Posted June 25, 2017 Share Posted June 25, 2017 I have a 2006 Legacy GT SpecB with COBB downpipe and full exhaust with COBB Stage 2 tune from Accessport V2. Lately I have noticed that when I accelerate around 2-3000 rpm the car stutters but continues to accelerate, vibrating the car, and lacks in power throughout power band. So far, we have searched for vacuum leaks from the top of the engine bay and did not find anything. As well as checked air filter and mass airflow sensor. We also plugged in the Accessport and went for a drive, monitoring boost, and would peak at 9.6 pounds of boost. All fluids seem to be normal so I am trying to get some feedback as to what my problem may be before I take it in and spend a bunch of money for someone to figure it out. Thanks for the help! Link to comment Share on other sites More sharing options...
ehsnils Posted June 25, 2017 Share Posted June 25, 2017 Any misfires detected - and any knock detected? Also make sure you don't have any loose heat shields or similar stuff since they might cause the knock sensor to go in. A wastegate not closing correctly can also be a factor. More pieces that may play a factor is the MAP and O2 sensor in addition to the MAF. Link to comment Share on other sites More sharing options...
Max Capacity Posted June 25, 2017 Share Posted June 25, 2017 Have you cleaned the MAF lately ? It's a once a year thing. How are the engine grounds ? O2's will normally throw a CEL. 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
compsurge Posted June 25, 2017 Share Posted June 25, 2017 Buy a VAG-Com cable for $15 from eBay and learn how to datalog in the tuning subforum. There is a program called Learning View. You can use this to pull data from the computer. Don't reset the ECU at all while you are troubleshooting. Link to comment Share on other sites More sharing options...
Max Capacity Posted June 25, 2017 Share Posted June 25, 2017 others have found a lose coil connector, make sure all four are tight. 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
gaethzac000 Posted June 26, 2017 Author Share Posted June 26, 2017 Thanks for all the feedback, guys! I'll try things out and see how it goes! Link to comment Share on other sites More sharing options...
Max Capacity Posted June 26, 2017 Share Posted June 26, 2017 http://people.csail.mit.edu/ilh/vacation/ That may help too. 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
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