Slow acceleration F355 and not good sound from the exhaust | FerrariChat
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Slow acceleration F355 and not good sound from the exhaust

Discussion in '348/355' started by power007, Jul 14, 2011.

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  1. power007

    power007 Karting

    Jun 1, 2009
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    #1 power007, Jul 14, 2011
    I think there is something wrong with the my car, I have 97/98 F355 with manual transmission. My car behaves very strangely when I have under 4000RPM. I get very little acceleration and the car sounds very quiet when I have the car under 4000RPM.. But over 4000RPM I get some sound from the exhaust (but still not as before). I feel that the car is a lot slower than before.

    It is also hard to get it up in speed over 6000rpm, and I dont have any good sound like before when i achieves over 6000rpm.. the car will not go well as before.

    what could it be? I have replaced all spark plugs, but it is exactly the same as before.
     
  2. xtcgt

    xtcgt Karting

    Nov 20, 2009
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    Robert Boynton
    #2 xtcgt, Jul 14, 2011
    slow down, check engine lights ? do they even work?
     
  3. power007

    power007 Karting

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    #3 power007, Jul 14, 2011
    I have not got any error message..
     
  4. Arturin

    Arturin Karting

    Aug 16, 2009
    201
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    #4 Arturin, Jul 14, 2011
    Check the cats. In my evo IX I had a plugged cat and I experienced this same thing, very slow revving, less sound, no way to boost beyond 0.4 bar... evos have nothing to do with ferraris but it could be a possibility.
     
  5. power007

    power007 Karting

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    #5 power007, Jul 14, 2011
    I have no cats, I have Capristo decat and Capristo stage 2 exhaust system. maybe my exhaust system that is broken?
     
  6. Arturin

    Arturin Karting

    Aug 16, 2009
    201
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    #6 Arturin, Jul 14, 2011
    Last edited: Jul 14, 2011
    If no cats I would check that the maf is clean, and if it is... I would then take it to a specialist. Did you have a cambelt change recently? check that the cam belts are tight and in good condition.
     
  7. power007

    power007 Karting

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    #7 power007, Jul 14, 2011
    all of the belts were replaced in 2007.. how do I clean the MAF???
     
  8. Arturin

    Arturin Karting

    Aug 16, 2009
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    #8 Arturin, Jul 14, 2011
    Last edited by a moderator: Sep 7, 2017
    With a no residue electrical contact cleaner spray. There are also maf cleaner sprays but I believe they are the same. Take the maf out and spray inside, you will see very thin wires, DON´T TOUCH THEM! Spray in the inside of the brownish circle piece in the picture. (the maf in the picture is not from a ferrari)

    Also, you changed the belts in 2007... to 2011 its 4 years so you have to change the belts ASAP, check that the belts are not breaking apart or that they are not loose before starting the car again, they could have jumped a tooth and that´s why you could be experiencing those problems.
    Image Unavailable, Please Login
     
  9. power007

    power007 Karting

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    #9 power007, Jul 14, 2011
    where is the MAF on F355???
     
  10. vvassallo

    vvassallo F1 Veteran

    Aug 4, 2006
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    Vince V
    #10 vvassallo, Jul 14, 2011
    Last edited by a moderator: Sep 7, 2017
  11. plugzit

    plugzit F1 Veteran
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    Dec 1, 2004
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    Bruce Bogart
    #11 plugzit, Jul 14, 2011
    Baffle in exhaust broken loose? Buy a cheap engine stethescope or use a broomstick to listen.
     
  12. jm3

    jm3 F1 Rookie

    Oct 3, 2002
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    #12 jm3, Jul 14, 2011
    Last edited: Jul 14, 2011
    I think you may still actually have the two main cats, and they have broken. Perhaps the Capristo decat was only the top (secondary) cats.
     
  13. sdbmwfxr

    sdbmwfxr Karting

    Feb 25, 2011
    238
    San Diego
    #13 sdbmwfxr, Jul 14, 2011
    Lets not get ahead of ourselves.

    Based on your description, my first thought would be to test fuel pressure with a trusted gauge. If your cats are out, you may have had programming done to circumvent the post cat O2 sensors; which isn't helping as far as diagnosis. I would start with that and move from there.

    Certainly would not surprise me if your Mass Air is bad or some of the other suggestions such as a broken baffle in the exhaust, but before you start swapping parts I'd get a few things known good or bad before coughing up some cash for parts you don't need.
     
  14. power007

    power007 Karting

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    #14 power007, Jul 15, 2011
    thanks for the quick response, I have cleaned the MAF, but still does not help
     

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