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Engine stumbles

Discussion in '348/355' started by Lars_vet, May 19, 2007.

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  1. Lars_vet

    Lars_vet Formula Junior

    Feb 25, 2007
    603
    On the open road
    Full Name:
    Lars
    #1 Lars_vet, May 19, 2007
    when I cruise at 50Mph/80kmh, (around 2500rpms) in 5 th gear, and try to gently accelerate, its like the engine stumbles a bit...when i get above 3000 rpms is all smooth sailing..

    Should I just keep the reves up a bit,and down shift to 4th..These "high revs" are new to mee

    Or dosent this sound normal?
     
  2. mwhitesell

    mwhitesell Formula 3

    Sep 17, 2006
    1,083
    Atlanta
    Full Name:
    Mark
    #2 mwhitesell, May 19, 2007
    2500 is a low in the power curve for 5th gear. Although stumbles could be the air cleaner or plug wires, or stuff like that. I would shift down to get it to 3500+.
    When I first bought my 355 it was hard to find the shift points, especially with the top down since the engine is so much louder than any other car.
     
  3. Lars_vet

    Lars_vet Formula Junior

    Feb 25, 2007
    603
    On the open road
    Full Name:
    Lars
    #3 Lars_vet, May 19, 2007
    i just pulled the air filter... 10 leaves and ALOT of sand, I could keep beating that thing for hours and it would still be dusty. I cleaned it as good as I could without my Air tools. Time for a new filter I guess.

    First thing i noticed was that the car became louder, the NOISE would kick in at at 5k before now its strong from 4k...Definatly louder!

    3000 rpms i 5th, it wil still stumble/shake when I accelerate. When I get above 3000, or just shift down to 4th, it pulls hard and even all the way to rev limit.


    So is 3000 rpms in 5th just wrong in a 90´348, or do I have a problem?
     
  4. Lars_vet

    Lars_vet Formula Junior

    Feb 25, 2007
    603
    On the open road
    Full Name:
    Lars
    #4 Lars_vet, May 19, 2007
    really.. Nobody has any idea?
     
  5. f355spider

    f355spider F1 World Champ
    Owner Rossa Subscribed

    May 29, 2001
    18,053
    USA
    #5 f355spider, May 19, 2007
    I am no expert, but would inspect your spark plugs and wires.
     
  6. Lars_vet

    Lars_vet Formula Junior

    Feb 25, 2007
    603
    On the open road
    Full Name:
    Lars
    #6 Lars_vet, May 19, 2007
    yes, But when the stumbling is only at that specific situation hard load/acceleration with reves below 3k

    Wouldet plugs/wires give problems on the entire rev band?
     

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