87 US Testarossa low idle until warm | FerrariChat
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87 US Testarossa low idle until warm

Discussion in 'Boxers/TR/M' started by kartboy1234, Aug 27, 2025 at 2:28 PM.

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  1. kartboy1234

    kartboy1234 Formula Junior

    Nov 10, 2014
    726
    Palos Verdes, CA
    Full Name:
    Michael L
    #1 kartboy1234, Aug 27, 2025 at 2:28 PM
    Hey everyone. I have a 1987 Testarossa, US Spec. I had it tuned and the idle set by a shop. It runs amazing when warm. But when I cold start the car the idle is low and its down on power. But once it warms up it sits exactly at 1k rpm and is smooth. The mechanic did comment on a vacuum leak from a device on the right rear fender. He plugged the hose. I believe it connects to the air injection system.

    Anyone know about that? Ill be under the car soon and can check anything people recommend.
    Thank you
     
    ryalex likes this.
  2. kartboy1234

    kartboy1234 Formula Junior

    Nov 10, 2014
    726
    Palos Verdes, CA
    Full Name:
    Michael L
    #2 kartboy1234, Aug 27, 2025 at 2:37 PM
  3. Warlock

    Warlock Karting

    Nov 24, 2013
    58
    Dallas, TX
    Full Name:
    Sunny
    #3 Warlock, Aug 27, 2025 at 2:59 PM
    Steve had a nice graphic on this somewhere. As I recall, there is a differential pressure switch that senses engine vacuum and fires the cold start injector, so that would account for your cold engine behavior. Try searching for "removing secondary" or similar, you'll find it
     
  4. kartboy1234

    kartboy1234 Formula Junior

    Nov 10, 2014
    726
    Palos Verdes, CA
    Full Name:
    Michael L
    #4 kartboy1234, Aug 27, 2025 at 3:19 PM
    Warlock likes this.

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