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355 rough start!

Discussion in '348/355' started by BOBAER, Jul 23, 2006.

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  1. BOBAER

    BOBAER Formula Junior

    Jun 6, 2006
    261
    Jersey
    Full Name:
    Jon
    #1 BOBAER, Jul 23, 2006
    All of a sudden, my car idles very low at the start and sounds like it is going to stall for the first few minutes. I have rev the engine to move forward in first or reverse. Once I get going it seems to be fine and subsequent starts while warm dont seem to be a problem. That was happening for several days, now in addition the check engine 1-4 has come on and off intermitently. Any ideas.
     
  2. hak

    hak Rookie

    Jul 23, 2006
    25
    #2 hak, Jul 24, 2006
    Check right hand side (banks 1-4 ithink) airflow meter to see if wire is intact.
     
  3. chaa

    chaa F1 Veteran

    Mar 21, 2003
    5,058
    #3 chaa, Jul 24, 2006
    Sounds familiar,Turn of the battery for a few hours, over night is best. then restart the car the next day and allow the ECUs to relearn. Let the car idel with out touching the throttle for about 15mins. This should sort it out. If not then change over the air flow meters on ya 95 model (you have 2, so swap them) and see if this cures it,then If not change the plugs.
     
  4. BOBAER

    BOBAER Formula Junior

    Jun 6, 2006
    261
    Jersey
    Full Name:
    Jon
    #4 BOBAER, Jul 24, 2006
    Do you know exactly where the battery shut off switch is located?
     
  5. dcghostrider

    dcghostrider Karting

    Jun 28, 2006
    169
    #5 dcghostrider, Jul 24, 2006
    Open the trunk and remove panel on the passenger side and turn round knob to the off position, this will shut the battery off. Remember to turn it back on, start the car and let it idle a bit so the car can reset it's brain.
     
  6. BOBAER

    BOBAER Formula Junior

    Jun 6, 2006
    261
    Jersey
    Full Name:
    Jon
    #6 BOBAER, Jul 24, 2006
    Thanks alot, I will give that a try and let you guys know. If that works it would be great and a big relief.
     
  7. chaa

    chaa F1 Veteran

    Mar 21, 2003
    5,058
    #7 chaa, Jul 24, 2006
    I bet it will work, but ya got ta keep it disconected over night for the best results. Many people have used this method.
     
  8. BOBAER

    BOBAER Formula Junior

    Jun 6, 2006
    261
    Jersey
    Full Name:
    Jon
    #8 BOBAER, Jul 25, 2006
    Update, I shut down the battery last night until this morning then switched it back on. The car started pretty good, still a little rough but not nearly as bad. I let it idle for 15 minutes then only had a chance to drive it around the block to see if the check engine light came on.

    So far so good, but the real test will be to let it sit again all day and see what happens tonight when I get home from work.

    Thanks
     
  9. gothspeed

    gothspeed F1 World Champ

    May 26, 2006
    10,244
    U.S.A.
    Full Name:
    goth
    #9 gothspeed, Jul 27, 2006
    Here is a thought, sometimes on startup my 355 will idle a little rough and will get worse when the fans start up. This leads me to believe there may not be enough current going to the ignition system.

    Possible causes: The chasis grounds may be dirty/oxidized, notorious weak alternator or maybe even bad plugs/wires.

    Anyone??
     
  10. FL 355

    FL 355 Formula 3

    Nov 3, 2002
    1,665
    Ft Laud
    Full Name:
    Frank Lipinski
    #10 FL 355, Jul 28, 2006
    I hope re-setting the ECU worked for you. However, because it's rough only on first start / cold start and not subsequent starts would make me look at the air pump located in the engine bay next to the right brake light.

    When you start cold can you here the pump "whine" at a high pitch for about a minute or two?
     
  11. BOBAER

    BOBAER Formula Junior

    Jun 6, 2006
    261
    Jersey
    Full Name:
    Jon
    #11 BOBAER, Jul 28, 2006
    Update: I have taken the car out a couple of times now since I reset the battery and joy joy, seems to be working fine. The engine light has not come back on and the rought start has seemed to disapear.

    I wonder what caused this to happen in the first place.
     
  12. chaa

    chaa F1 Veteran

    Mar 21, 2003
    5,058
    #12 chaa, Jul 28, 2006
    You see thats what ya get when ya listen to a man that knows:D:D Bloody 355s LOL!!
     
  13. f355spider

    f355spider F1 World Champ
    Owner Rossa Subscribed

    May 29, 2001
    18,053
    USA
    #13 f355spider, Mar 30, 2007
    I had this problem of low idle (intermittently) upon both cold and hot starts. Car would idle at around 750 rpm. Shut off, and restart, and usually it would idle correctly. Tried cleaning the Bosch idle control valve and seemed better, but the problem returned a week later. Replaced it and the problem went away for about a month, then returned. Through the able assistance of 91TR (Steve Magnusson) we figured out that it was the Bosch Throttle Position Potentiometer that was bad. It was intermittently not giving a signal that the throttle was at idle....so the Motronic gave no signal to the idle control valve. New throttle position potentiometer, and perfect idle on every start, hot or cold. :)
     
  14. Nicksta

    Nicksta Formula Junior

    Sep 16, 2006
    535
    DC Ranch & NY, NY
    Full Name:
    Nick Ingle
    #14 Nicksta, Mar 31, 2007
    First time I saw this post and its about my car! Well, so far, so good. Thanks for the info!
     

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