308 GTSi does not return to idle sometimes | FerrariChat
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308 GTSi does not return to idle sometimes

Discussion in 'Technical Q&A' started by stephenofkanza, Jul 15, 2006.

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  1. stephenofkanza

    stephenofkanza Formula Junior

    Mar 5, 2005
    542
    Kansas
    Full Name:
    Stephen LeRoy Sherma
    #1 stephenofkanza, Jul 15, 2006
    Will wonders never cease, ?
    Fixed the hazard witch so that my turn signals work reliably with Verell’s help and another Gremlin pops up.
    My car is a 1981 308GTSi.
    This has happened 3 times but not all the time.
    Engine is warmed up oil is at least 160F.
    The engine has gone through the 1000rpm then 3000rpm and back to 1000rpm cycle.
    Get off the interstate and the engine does not idle at 1000, some times 3000 or 2000.
    Corrected with quick blips of the throttle.
    The engine not up to temperature light has never worked since I have owned her (Jan 2005).
    I am tempted to lube the throttle cable with graphite or silicone spray.

    Any ideas?


    stephen
     
  2. Iain

    Iain F1 Rookie

    Jan 21, 2005
    3,354
    UK
    #2 Iain, Jul 15, 2006
    Most likely cause is floor mats fouling your throttle pedal. Its about the most common cause of what you describe.

    If that's not it then you'll need to start looking at the throttle system all the way from the pedal through to the linkage at the plenum. There can be issues of sticky linkages at the pedal end.

    I.
     
  3. stephenofkanza

    stephenofkanza Formula Junior

    Mar 5, 2005
    542
    Kansas
    Full Name:
    Stephen LeRoy Sherma
    #3 stephenofkanza, Jul 15, 2006
    Thanks I check out floor mats first, then the linkage at the pedal end first.
    I already looked at the throttle cable at the engine end.

    stephen

    It did not occur to me the answer would be 'literally' ar my feet.
     
  4. spiderseeker

    spiderseeker Formula 3

    Jul 22, 2005
    1,718
    Colorado
    Full Name:
    Steve
    #4 spiderseeker, Jul 15, 2006
    Last edited by a moderator: Sep 7, 2017
    I've learned to leave my floormat at home. I also had the throttle stick at the engine-see photo, a little grease fixed it. (the roller has to "glide" inside the lever, mine was dragging until I greased it)
    Image Unavailable, Please Login
     
  5. miketuason

    miketuason F1 World Champ
    Owner Silver Subscribed

    Feb 24, 2006
    15,831
    Cerritos, CA.
    Full Name:
    Mike
    #5 miketuason, Jul 15, 2006
    It happened to once before the idling was cycling up and down and the problem was an O2 sensor, replaced it and the problem fixed it.
     
  6. stephenofkanza

    stephenofkanza Formula Junior

    Mar 5, 2005
    542
    Kansas
    Full Name:
    Stephen LeRoy Sherma
    #6 stephenofkanza, Jul 15, 2006
    THANKS to all have replied.
    I guess I will have to attach the floor mat, so that my none flexible body won't slide it up.

    Thanks again

    stephen
     
  7. stephenofkanza

    stephenofkanza Formula Junior

    Mar 5, 2005
    542
    Kansas
    Full Name:
    Stephen LeRoy Sherma
    #7 stephenofkanza, Jul 15, 2006
    Last edited by a moderator: Sep 7, 2017
    Thanks I believe the attached photo is same for an 81 308 GTSi.
    stephen
    Image Unavailable, Please Login
     
  8. Impactco

    Impactco Formula 3

    Jan 29, 2006
    1,615
    #8 Impactco, Jul 15, 2006

    This happened to me also. I spent an hour checking various things, lubed the cable, etc. Mat was the culprit.
     
  9. EDoug

    EDoug Formula Junior

    Apr 19, 2005
    277
    Southern Florida
    #9 EDoug, Jul 18, 2006
    If I remember correctly, the pollution controls want the car to rev up to about 2800 RPM until it is warmed up and then drop down to idle. The temperature sensor on the bottom of the coolant expansion tank closes when hot to accomplish this. You may want to confirm the proper switch function by pulling off the two wire connector while running and seeing what opening and closing (shorting) does. Disabling this function by shorting the connector full time my be an interim solution. Just a thought.
     
  10. f355spider

    f355spider F1 World Champ
    Owner Rossa Subscribed

    May 29, 2001
    18,055
    USA
    #10 f355spider, Jul 18, 2006
    Start with the MAT. 90% of the time it is the mat...trust me. If not...then pursue the other avenues listed.
     

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