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328 hard start when warm

Discussion in 'Technical Q&A' started by vikel, May 25, 2005.

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  1. vikel

    vikel Rookie

    Dec 4, 2003
    12
    Crofton, Maryland
    Full Name:
    James V. Cunningham
    #1 vikel, May 25, 2005
    My 1987 328 has been hard to start when its warm for some time. It always strarts right up when its cold. Once is has gotten warmed up and I have driven it, I have to give it gas in order for it to start. What could be causing this? I have played around with the fuel mixture (both lean and rich) but it makes no difference. Also, when I turn off the car, it always has a slight backfire or pop. What could cause this and are the two related? My catalytic converter was gutted several years ago but it did not happen right after this. This is a new engine and the only thing from the old engine is the fuel injection so I believe its related to this. Thanks.
     
  2. DGS

    DGS Seven Time F1 World Champ
    Rossa Subscribed

    May 27, 2003
    71,947
    MidTN
    Full Name:
    DGS
    #2 DGS, May 25, 2005
    Reluctant starting when warm can be a bad check valve in the fuel pump -- the pressure bleeds off the injection system and there's no cold start to help.

    Dunno if the backfiring would be related. Maybe the injection is spraying a bit too long after the ignition stops.

    You might check system pressure after turning off, if you have a handy CIS pressure checker.
    (I have one over here in NoVA, but I still don't know if I'm going to be working this weekend.)
     
  3. vikel

    vikel Rookie

    Dec 4, 2003
    12
    Crofton, Maryland
    Full Name:
    James V. Cunningham
    #3 vikel, May 25, 2005
    I would love to have the pressure checked. Let me know when you are available. Thanks. My e-mail address is [email protected]
    Jim
     

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