93 STS idles poorly
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Cadillac Seville / Cadillac Eldorado Forum Discussion, 93 STS idles poorly in Past Cadillac Vehicle Discussion; I've been working on a 93 Seville (with a friend) and finally have it on the road, it drives pretty ...
  1. #1
    SEATTLEBOI18's Avatar
    SEATTLEBOI18 is offline Cadillac Owners Member
    Automobile(s): 1993 Seville sls
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    Post 93 STS idles poorly

    I've been working on a 93 Seville (with a friend) and finally have it on the road, it drives pretty good but idols rough at low rpms.
    Also there is a weird fate high pitch sound when I press on the gas pedal and I can smell the gas its not a bad strong smell but noticeable. The RPM needle is never steady, I don't know jack about cars so if you could explain it to me like I'm 7 that would be great. It has about 135,000 miles on it.

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  3. #2
    basscatt's Avatar
    basscatt is offline Cadillac Owners Master
    Automobile(s): 89 Coupe DeVille, 95 Sedan DeVille, 03 SLS, two 02 DHS's
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    Re: 93 seville sls idols bad

    Quote Originally Posted by SEATTLEBOI18 View Post
    I've been working on a 93 Seville (with a friend) and finally have it on the road, it drives pretty good but idols rough at low rpms.
    Also there is a weird fate high pitch sound when I press on the gas pedal and I can smell the gas its not a bad strong smell but noticeable. The RPM needle is never steady, I don't know jack about cars so if you could explain it to me like I'm 7 that would be great. It has about 135,000 miles on it.
    =========================
    Also there is a weird fate high pitch sound when I press on the gas pedal
    probably a vacuum leak -
    would explain the sound -
    and at least part of - if not the sole cause of - the rough idle -

    and I can smell the gas its not a bad strong smell but noticeable
    obviously a gas leak -

    every piece of rubber could be over 20 years old -
    and has dried - and become brittle - with cracks all over it -

    inspect and replace as needed ALL rubber hoses -

    I don't know jack about cars
    so if you could explain it to me like I'm 7
    that would be great


    gasoline burns -

    gas fumes EXPLODE -

    if gasoline is leaking onto a hot motor -
    it quickly turns to gas fumes = BOOM -

    don't screw around with gas leaks -
    a gas fire can QUICKLY get out of control -

    do NOT keep the car in a gargae -
    until the gas leak is found - and repaired -

  4. #3
    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
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    Re: 93 STS idles poorly

    Check the intake manifold cover. It could be leaking at any point around the perimeter. Spray some Brakleen or TB cleaner around it at idle. If you get an RPM increase, you've found the leak.

    P.S.
    If that is the problem, be sure to use a torque wrench and the proper torque setting when reinstalling it.

    P.P.S.
    While you are at it, the FPR is inside the manifold and might account for your fuel smell. See the Tech Tips section for a tutorial on checking it.

    Pay particular attention to the note pertaining to the '93/'94.

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