Advice needed for testarossa stalling issue | FerrariChat
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Advice needed for testarossa stalling issue

Discussion in 'Boxers/TR/M' started by Hipporacer, May 20, 2022.

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  1. Hipporacer

    Hipporacer Karting

    Jun 26, 2021
    55
    Springfield IL
    Full Name:
    Julia M Stapleton
    #1 Hipporacer, May 20, 2022
    My 87 testarossa, now that its getting warmer out, is stalling when the AC is on. What happens is youll be going down the road, running just fine, but then you need to stop. So you push the clutch pedal in. The rpms then drop below 1k. Sometimes the engine recovers, other times it stalls out. If you let off the clutch, sometimes the car jerks back alive. If you turn the key back one click then forward the car restarts a bit smoother. My mechanic is thinking a solenoid or something. Also, at idle the oil preasure is running really low. Sometimes a bit below the first tick line. But when reved it does increase to the halfway line.
     
  2. turbo-joe

    turbo-joe F1 Veteran

    Apr 6, 2008
    9,531
    southwest Germany, France ( Alsace ) and Thailand
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    romano schwabel
    #2 turbo-joe, May 20, 2022
    when was the last oil change? I think when the engine not runs fine unburned fuel will get into the oil and so the oil pressure goes down at idle.

    how many rpm the engine has when warm ( so outside and the engine ) without AC? what HC you have at idle? have cat and sensors?
    you have thi sstalling problem when the engine is cold or when warm or always?

    the car starts then with the starter or when still rolling releasing the clutch?
    there is no solenoid for additional rpm when AC is on
     
  3. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,806
    30°30'40" N 97°35'41" W (Texas)
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    Steve Magnusson
    #3 Steve Magnusson, May 20, 2022
    What version TR? (US F113A040, early euro F113A000, late euro F113B000, something else?)

    1. One very easy thing to do is confirm that the throttle idle microswitch was working/adjusted correctly when the engine system was tweaked-up. If you unplug it at warm idle = the engine idle RPM should increase (and, likewise, when plugged back in, the idle should drop back down). If it doesn't = idle microswitch is not working (or is misadjusted) = the timing was too far advanced at warm idle during the tweak-up process = the warm idle airflow has to be "choked" way down to get the 1000 RPM = makes the whole system more unstable/sensitive especially during hard deceleration.

    2. Is your Mechanic using the dash tach display to set the 1000 idle RPM speed or a more accurate signal, like the Flywheel RPM signal in Hz (converted to RPM) or a digital timing light with RPM capability? I wouldn't trust the dash tach display. Also, targeting the upper end of the spec (1050 RPM warm idle rather than 1000 RPM warm idle) is a common practice.
     
  4. Hipporacer

    Hipporacer Karting

    Jun 26, 2021
    55
    Springfield IL
    Full Name:
    Julia M Stapleton
    #4 Hipporacer, May 20, 2022
    This is an American 87 tr. And it stalls regardless of it bring after a cold start or when engine is warm when ac is running. When idling and warm engine is at roughly 1100rpm. Turning the ac on causes a slight down tic but eventually pops up to 1100 again. The stalling happens when shifting if shifting isn't fast enough, or again if slowing down or switched to neutral when ac is running. I have sent a link for this post to my mechanic. So any advice you give here, he'll be able to read, and hopefully help me out. So basically, when ac is on and clutch is pressed down all the way. The engines revs fall below 1k and it dies or sometimes recovers.
     
  5. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,806
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #5 Steve Magnusson, May 20, 2022
    Wait, are you saying:

    1. The RPMs are higher (like a normal 2K~3K driving along), you press down the clutch pedal to prepare to come to a stop, and the RPM falls but undershoots below the 1000 RPM speed and sometimes stalls,

    or,

    2. You are stationary at warm idle, press down the clutch pedal, and the engine RPM falls?
     
  6. Hipporacer

    Hipporacer Karting

    Jun 26, 2021
    55
    Springfield IL
    Full Name:
    Julia M Stapleton
    #6 Hipporacer, May 20, 2022
    Both number 1 and 2 are occuring. But mostly number 1.
     
  7. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,806
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #7 Steve Magnusson, May 20, 2022
    Any #2 is a bad sign for the throw-out bearing in the clutch. If you're stationary in Neutral at warm idle, and push the clutch pedal down = the idle RPM should never go down (it might go up a little if the gearbox oil is cold). Something causing #2 would also contribute to #1, but you may have more than just the engine not being tweaked-up well. Good Hunting!
     
  8. Jay535

    Jay535 Karting

    Mar 10, 2011
    149
    Toronto Area, Canada
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    Jay Lebo
    #8 Jay535, May 20, 2022
    Was having this exact same problem a couple of weeks ago. Turned out one of my distributor caps was full of oil.
     
  9. Hipporacer

    Hipporacer Karting

    Jun 26, 2021
    55
    Springfield IL
    Full Name:
    Julia M Stapleton
    #9 Hipporacer, May 20, 2022
    Thanks for the tip about the distubtor caps. My mechanic thought that might be a problem.
     
  10. 2008F430

    2008F430 Karting

    Apr 30, 2020
    106
    St Augustine
    #10 2008F430, May 28, 2022
    Jay535 likes this.
  11. Hipporacer

    Hipporacer Karting

    Jun 26, 2021
    55
    Springfield IL
    Full Name:
    Julia M Stapleton
    #11 Hipporacer, May 28, 2022
    I have not yet found the culprit. I went for a drive today and it was kinda cool I thought. But I still stalled out of the garage. Into the garage. And a few places in between when in 1st gear or reverse. And I did not have the ac on at all. Not sure what's causing it. My mechanic is still looking into it and has not really done anything yet. I think we're going to start by adjusting the idle and cleaning the distributor caps.
     
  12. vincenzo

    vincenzo F1 Rookie

    Nov 2, 2003
    3,373
    #12 vincenzo, May 28, 2022
    Has your car passed a smog test (gas analysis)?
     

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