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testarossa idle problem

Discussion in 'Technical Q&A' started by dw5464, Jul 9, 2011.

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  1. dw5464

    dw5464 Rookie

    Jul 9, 2011
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    #1 dw5464, Jul 9, 2011
    91..car starts fine idles fine but when running and you get to stop light etc it cuts off i can keep rpms at 1000 and it wont do it but if i push in clutch and come to stop it shuts off....
     
  2. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    Steve Magnusson
    #2 Steve Magnusson, Jul 9, 2011
    Is this a new problem that occurred suddenly (i.e., it was OK, but the behavior has now suddenly changed), or has it always been this way (since someone last fondled its adjustments)?

    What version -- US engine F113A040, late euro engine F113B?

    Are you saying that the idle "droops" below 1000 RPM during decellerating to a stop (and usually stalls), but, if you keep it running, the idle recovers to 1000 RPM?
     
  3. Darolls

    Darolls F1 Veteran
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    #3 Darolls, Jul 10, 2011
    Ditto, need more info.
     
  4. dw5464

    dw5464 Rookie

    Jul 9, 2011
    7
    #4 dw5464, Jul 11, 2011
    actually i just bought it...15k miles all service history but not sure how long its been doing it, us engine, and yes during deceleration to a stop but if i keep it up to 100 its fine

    thanks
    danny
     
  5. dw5464

    dw5464 Rookie

    Jul 9, 2011
    7
    #5 dw5464, Jul 11, 2011
    actually i just bought it...15k miles all service history but not sure how long its been doing it, us engine, and yes during deceleration to a stop but if i keep it up to 100 its fine

    thanks
    danny
     
  6. Darolls

    Darolls F1 Veteran
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    #6 Darolls, Jul 12, 2011
    Don't you mean 1000rpm? Idle should be at 1000+-100 at idle.

    Raise the idle speed.
     
  7. dw5464

    dw5464 Rookie

    Jul 9, 2011
    7
    #7 dw5464, Jul 12, 2011
    yes i meant 1000 and it idles at 1000 ok unless coming to stop or for example pushing in clutch rpms drop low enough to shut off
     
  8. Darolls

    Darolls F1 Veteran
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    #8 Darolls, Jul 12, 2011
    Have you checked idle with an external tach?


    Something just doesn't seem right! Disengaging the clutch at idle should theoretically increase rpm or at least keep it at the same level when the engine is at operating temp.
     
  9. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,663
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #9 Steve Magnusson, Jul 13, 2011
    And I hope that you got a heck of a $ discount ;)

    Two fairly easy things that I'd start with for that symptom are:

    1. Confirm that there is +12V power present to run the "E" part of the KE-Jet system:

    Image Unavailable, Please Login

    If there isn't, and someone has tweaked it up to run quasi-OKish (as a K-Jet), you'll have to retweak (after fixing the missing +12V power issue).

    2. Check the operation of the throttle microswitch per this diagram:
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    This throttle microswitch "tells" the injection ECU to not let things get too lean during closed-throttle decelleration (as the Lambda system will undershoot if it just uses the O2 sensor signals).

    Most likely, the whole thing is just improperly tweaked up, but you might get lucky... good hunting...
     

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