F355 lag, boggin... very strange! | Page 2 | FerrariChat

F355 lag, boggin... very strange!

Discussion in '348/355' started by Arturin, Jun 10, 2011.

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  1. Arturin

    Arturin Karting

    Aug 16, 2009
    201
    Spain
    #26 Arturin, Jun 28, 2011
    Last edited: Jun 28, 2011
    I drove 170mph on the highway, when I got to my girfriends town I drove slowly(there are people on the streets and stuff) then I got my my gf´s house and I stopped the engine. I thought it was obvious that I didn´t enter my gf´s garage at 170mph and shut off the car...

    By the way If you`ve ever been to an autobahn you will realize that they´re not out of the world super special roads, so there´s nothing special about doing 170mph in a road which is not an autobahn.


    If I got caught I would go to jail theoretically, but if there´s no traffic, there´s no rain etc usually the judge doesn´t put you into prison, at least the first time.



    Back to the topic, I´ve been synchronizing the right banks´s itbs and the thing is way better so I can say 90% sure that the problem was this. I couldn´t continue because its to hot in here + the engine´s heat I was about to faint.
    I´ll update when having the itbs 100% synchronized.
     
  2. Arturin

    Arturin Karting

    Aug 16, 2009
    201
    Spain
    #27 Arturin, Jul 16, 2011
    Last edited: Jul 16, 2011
    SOLVED!!!!!!

    At last! I synchronized the throttle bodies and adjusted both tps perfectly but I had that bogging issue still. It was less than before but it was still there. I continued reading threads related to idle problems to inspire myself but nothing.

    Late at night while I was reading a book about porsche engine rebuilding I came up to a chapter where it talked about oxygen sensors. I started reading about open/closed loop, when the ecu turns to closed or open etc and I learned at least the basic things about. The ecu doesn´t use the o2 reading until a certain temp. When engine was cold the throttle response was perfect but when hot -> the bogging party began.

    I started the cold car and let it idle. Everything perfect, when it started getting to its operating temeprature suddenly, the engine sound changed completely. I assumed that was when the ecu changed from open to closed loop (or viceversa, can´t remeber which is which) Went to the nearest parts supplier, picked two new bosch o2 sensors and F*CK YEAH!!!!. My car running like new!!

    The car is so smooth I can´t believe it!


    My car is almost 30K miles.
    It has never showed a CEL.
    It has no cats, and before it smelled quite a bit to gas at idle, but now with the new sensors that smell has almost gone.
    The o2 sensors (BOSCH) are supposed to be changed in 60K or 90K miles depending on the model, but from all the reading I´ve been doing I´ve learned that o2 sensors become kind of "slow" with time, enough to spoil the ride quality but not to throw a CEL.
    Also, i had some exhaust blurping when I lifted the throttle, I thought this was because of the straight pipes and the tubi exhaust
    but now that blurping has gone.

    Hope this helps someone in the future.
     

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