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348 cold start

Discussion in '348/355' started by ginsuguy, Jun 27, 2007.

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  1. ginsuguy

    ginsuguy Karting

    May 4, 2006
    209
    #1 ginsuguy, Jun 27, 2007
    Couldn't find any cold start fixes in search, only hot. My 90 348ts tarts up quick but idles rough until you give it some gas. Idle races up and down and is just not smooth running at idle. When it warms, its good. Any ideas? Thanks all
     
  2. No Doubt

    No Doubt Seven Time F1 World Champ

    May 21, 2005
    72,740
    Vegas+Alabama
    Full Name:
    Mr. Sideways
    #2 No Doubt, Jun 27, 2007

    1.idle air controllers are old or need cleaning
    2. idle air throttle body passage-ways need cleaning
    3. idle bypass screws need adjusting

    ^^^ most likely causes above ^^^

    VVV less likely causes below VVV

    4. alternator is causing voltage fluctuations (Motronic 2.5 and 2.7 use the alt/batt voltage to determine the base fuel mixture)
    5. obstruction in your exhaust
    http://www.club348.com/technical/Tech/348.html#Idle
     
  3. PAP 348

    PAP 348 Ten Time F1 World Champ
    Lifetime Rossa Owner

    Dec 10, 2005
    100,224
    Mount Isa, Australia
    Full Name:
    Pap
    #3 PAP 348, Jun 27, 2007

    Thats what I would also go with 1st. :):)
    Clean them with some spray carby cleaner. Should be able to get some from your local parts shop. Buy a 2nd can and clean those throttle bodies while you are there. :):)
     
  4. ginsuguy

    ginsuguy Karting

    May 4, 2006
    209
    #4 ginsuguy, Jun 27, 2007
    Thanks PAP and No D, you're the best!!!!!
     
  5. fatbillybob

    fatbillybob Two Time F1 World Champ
    Consultant Owner

    Aug 10, 2002
    29,167
    socal
    #5 fatbillybob, Jun 27, 2007
    I would start first by disconnecting and reconnecting key connecotrs like TPS and MAF and both coil pak connecotrs on each side of the rear uprights. Then dsconnect the battery for 10 seconds and reconnect the battery. Turn off all accessories like the A/C and radio and start the car and don't touch it for 10 minutes. Only pulse the throttle if for sure it is going to die. If it sounds like it is going to die leave it alone for 10 minutes. Then turn the car off and see what happens with a cold engine in a few hours.
     

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