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91 TR Issues

Discussion in 'Technical Q&A' started by MordaloMVD, Sep 9, 2005.

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  1. MordaloMVD

    MordaloMVD F1 Rookie

    Sep 7, 2005
    4,222
    WA
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    Michael von Ditter
    #1 MordaloMVD, Sep 9, 2005
    I bought a 91 Testarossa and found it had little power. It turns out that 3 of the 4 cats were bad. Replaced the cats with super flows and a Capristo exhaust. Car now has more power, however, it idles poorly and misses, back fires, badly at low RPM. Further, at 70 mph in 5th gear it acts like it can’t decide if it wants to go faster or slow down. Prior to cat and exhaust change it had none of these problems other than lack of power. Oh ya, mileage has also dropped from approx 17mpg to 12mpg. Took it to the shop and they “fixed” it. Came back worse than when it left. CLUES? HEELLLPP!
     
  2. No Doubt

    No Doubt Seven Time F1 World Champ

    May 21, 2005
    72,740
    Vegas+Alabama
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    Mr. Sideways
    #2 No Doubt, Sep 9, 2005

    Backfires on fuel injected cars are generally due to an air/fuel mixture that is too lean.

    If your prior owner had 3 bad out of 4 cats, then he probably had an A/F that was too rich (burns up the cats).

    That probably means that your O2 sensors are shot.

    ...and that's if you are lucky. You could have a timing or cam issue...but start with the cheap fixes first (e.g. O2 sensors first, then check your A/F ratio).
     
  3. Tifoso1

    Tifoso1 F1 Rookie

    Nov 18, 2003
    2,606
    Pacific NW
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    Anthony C.
    #3 Tifoso1, Sep 10, 2005
    Where in the NW are you located? and what shop did you take your car to?
     
  4. steve f

    steve f F1 World Champ

    Mar 15, 2004
    12,119
    12cylinder town
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    steve
    #4 steve f, Sep 10, 2005
    take it to somebody that knows what they are doing easier cheeper and less stress
     
  5. MordaloMVD

    MordaloMVD F1 Rookie

    Sep 7, 2005
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    Michael von Ditter
    #5 MordaloMVD, Sep 10, 2005
    Port Orchard, WA. I took it to Cavalino's in Bellingham. Actually headed there in a few minutes for their new opening. Not sure that they will want to see me.
     
  6. Tifoso1

    Tifoso1 F1 Rookie

    Nov 18, 2003
    2,606
    Pacific NW
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    Anthony C.
    #6 Tifoso1, Sep 10, 2005
    First of all, welcome to the club. Just curious, did the they talk you into getting a new exhaust system after a complete check up first, as in the O2 sensors and sort like the others said?

    I would probably take your car to either Ferrari of Seattle or Mr. Carlo Durante at Alfa of Tacoma. Carlo is extremly busy so be prepared to leave the car with him for awhile, but you can trust that things will be done right. Carlo is the technical director for the FCA-NW and has been working on Ferraris since at least the 70's. Anyway, for the pre-techno-gizmo Ferraris, and a 91 TR falls under that catagory, there is no one better than Carlo, until proven otherwise.
     
  7. barabus

    barabus F1 Rookie

    Aug 22, 2004
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    Si
    #7 barabus, Sep 10, 2005
    Do you have to have the cats on in US? I have no cats on my UK 90 model and have a sports exhaust nice and loud and goes great :D
     
  8. MordaloMVD

    MordaloMVD F1 Rookie

    Sep 7, 2005
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    Michael von Ditter
    #8 MordaloMVD, Sep 11, 2005
    No, they didn't trey to upsell me or anything. The exhaust was changed before they ever saw the car. As to Carlo...... I can't even get him to return a phone call. He may be the best, but that means nothing if he doesn't do any work.
     
  9. MordaloMVD

    MordaloMVD F1 Rookie

    Sep 7, 2005
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    Michael von Ditter
    #9 MordaloMVD, Sep 11, 2005
    In most areas of the US you have to have your cats installed.
     
  10. MordaloMVD

    MordaloMVD F1 Rookie

    Sep 7, 2005
    4,222
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    Michael von Ditter
    #10 MordaloMVD, Sep 14, 2005
    Rumor has it that they (Carlo) had a 355 sitting there for almost a year and it finally got moved to Cavallinos in Bellingham to get the valve job done. As to mine, all better!! pheu!!
     

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