'91 Transmission & Fuel Issues
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Cadillac Allante Forum Discussion, '91 Transmission & Fuel Issues in Past Cadillac Vehicle Discussion; I recently (July) purchased a very nice '91 California car. Car did real well the first few weeks or so, ...
  1. #1
    drbv59 is offline Cadillac Owners Member
    Automobile(s): 1991 Allante
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    '91 Transmission & Fuel Issues

    I recently (July) purchased a very nice '91 California car.
    Car did real well the first few weeks or so, but then started developing a very
    strong fuel smell, much like a rich fuel mixure. Cadillac dealer confirmed no fuel
    leaks anywhere, and seemed to agree it's running rich but had no "quick" ideas
    without tearing into things a bit deeper. The car runs pretty well but does seem to run just a bit rough during acceleration. My other issue is the tranny. All was well until a few weeks ago when I shifted from Park to Reverse, the car failed to go
    Into gear. After a few seconds, it finally caught. The fluid and filter was changed
    recently, and I checked the level to make sure all was well. This has happened
    a few times since with the car eventually going into gear after warming up a few
    minutes. Once on the road, the shifting seems very strong and smooth.
    Any ideas what I may be looking at here. between the fuel and transmission
    issues, I'm real concerned I may have a major repair that I can't really justify
    right now.

    Thanks for any input.


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  3. #2
    carnut is offline Cadillac Owners Master
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    Re: '91 Transmission & Fuel Issues

    With no external leaks, I would suspect a leaking injector. Hard to pin point without the service manual and verifying fuel trim left bank vs. right bank. How many miles?

  4. #3
    drbv59 is offline Cadillac Owners Member
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    Re: '91 Transmission & Fuel Issues

    121,000 mi on the car.
    Supposedly 4 of the injectors were replaced shortly before I purchased the car.

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    carnut is offline Cadillac Owners Master
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    Re: '91 Transmission & Fuel Issues

    Thru on board diagnostics, you can manually short out one injector at a time to verify all are performing the same with the same RPM drop as shorted. That, though will not locate a leaking one. There was a recall on gas caps for leaking fumes, but I doubt thats your issue. Have a dealer run the VIN for outstanding recalls. One method of checking a leaking injector is to watch fuel pressure after the engine's been shut off. It should hold "rest" pressure for a span of time. If it drops quickly then a leaky injector is suspect. It requires you tap into the fuel line with a fuel pressure gauge!

  7. #5
    drbv59 is offline Cadillac Owners Member
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    Re: '91 Transmission & Fuel Issues

    Thanks for the info!

  8. #6
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Re: '91 Transmission & Fuel Issues

    Has the FPR been checked?

  9. #7
    drbv59 is offline Cadillac Owners Member
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    Re: '91 Transmission & Fuel Issues

    I can't say for sure if this was checked during my last visit to the dealer- probably not.
    I have plans to have this issue checked by another mechanic next week. My main concern at this point is the transmission. Does anyone know if this tranny is Allante specific- meaning hard to replace/repair?

  10. #8
    carnut is offline Cadillac Owners Master
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    Re: '91 Transmission & Fuel Issues

    Yes, trans is Allante specific and solenoids are hard to find. You might try www.allantesource.com. I've seen the rubber O ring on the trans filter inlet tube be either missing or the old one not removed, which would cause oil drain back and delayed engagement. That web site also has a very simple ABS diagnostic check out that is very informative to a new Allante owner!

  11. #9
    drbv59 is offline Cadillac Owners Member
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    Re: '91 Transmission & Fuel Issues

    Thanks for the info!

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