4.5L TBI whistling
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HT4100 4.1, 4.5, 4.9 Discussion, 4.5L TBI whistling in Cadillac Engine Technical Discussion; After I let off of the accelerator completely from a full-throttle jump, I hear a very faint, half-second long whistling ...
  1. #1
    SlxAlxx's Avatar
    SlxAlxx is offline Cadillac Owners Fanatic
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    4.5L TBI whistling

    After I let off of the accelerator completely from a full-throttle jump, I hear a very faint, half-second long whistling sound. This just appeared a few hours ago. The oil is clean, coolant is clean, and the engine has 156,000 miles on it. What do you think it could be?

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    awadecki is offline Cadillac Owners Enthusiast
    Automobile(s): 76 Eldo (54k), 76 Eldo (52k), 78 Eldo (9k), 85 Deville (43k)
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    Re: 4.5L TBI whistling

    Do you have an aftermarket air cleaner? Sounds like its related to a VERY high vacuum situation...probably a leak somewhere.

  4. #3
    SlxAlxx's Avatar
    SlxAlxx is offline Cadillac Owners Fanatic
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    Re: 4.5L TBI whistling

    I just replaced the filter with an A/C Delco one last week. There are two wing screws missing from the air cleaner housing, but that has never made a difference before.

  5. #4
    SlxAlxx's Avatar
    SlxAlxx is offline Cadillac Owners Fanatic
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    Re: 4.5L TBI whistling

    The whistle turned into a cough. This only happens after full throttle.

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