EXO Posted June 7, 2015 Share Posted June 7, 2015 Hey guys I am driving a 08 Legacy GT 5EAT. I am experiencing pulsing hesitation under full throttle, it does not happen if I ease up on the throttle. When WOT, the acceleration is smooth until around 3k rpm where it will hesitate and recovers in less than a sec and then it hesitates again and the process repeats itself. When it hesitates it feels like something is preventing the rpm from rising Along the process the car is still picking up speed though I assume not as fast. What kind of possible issues I might be looking at? Thanks! Link to comment Share on other sites More sharing options...
funky monk Posted June 8, 2015 Share Posted June 8, 2015 I had a similar problem as soon as I bought my GT a couple years ago. Ended up being the fuel pressure regulator. $60 or so for the part. Already replaced the fuel pump and almost had the injectors pulled for a flow test at the recommendation of Cobb before my local mechanic figured it out. Never again. It behaved the same way though, it would seem to lose power and hesitate before catching and continuing through the gear. It also had trouble starting up cold or warm. Not sure if that's a problem for you as well. Link to comment Share on other sites More sharing options...
JmP6889928 Posted June 8, 2015 Share Posted June 8, 2015 Front O2 sensor Link to comment Share on other sites More sharing options...
EXO Posted June 8, 2015 Author Share Posted June 8, 2015 I had a similar problem as soon as I bought my GT a couple years ago. Ended up being the fuel pressure regulator. $60 or so for the part. Already replaced the fuel pump and almost had the injectors pulled for a flow test at the recommendation of Cobb before my local mechanic figured it out. Never again. It behaved the same way though, it would seem to lose power and hesitate before catching and continuing through the gear. It also had trouble starting up cold or warm. Not sure if that's a problem for you as well. Mine feels like the RPM is hitting a cap for less than a sec then the cap is removed then the cap is back again. I have no trouble starting up though, I will definitely check on my fuel pressure regulator. Thanks! Link to comment Share on other sites More sharing options...
EXO Posted June 8, 2015 Author Share Posted June 8, 2015 Front O2 sensor Great, I will check my O2 sensor out. Thanks! Link to comment Share on other sites More sharing options...
143prasanths Posted September 11, 2020 Share Posted September 11, 2020 Great, I will check my O2 sensor out. Thanks!Mine is doing the same now. Did you figure it out? Sent from my YAL-L21 using Tapatalk Link to comment Share on other sites More sharing options...
tailander Posted September 13, 2020 Share Posted September 13, 2020 Had the same issue on my 08 spec b. Boost is good until 4k rpm and then would bog/hesitate/stutter. I cleaned the maf and everything went away. Make sure not just to clean the visible wire but the wire/s hidden inside that longish protrusion. Link to comment Share on other sites More sharing options...
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