what does the computer look like and where is it on a 91 deville
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, what does the computer look like and where is it on a 91 deville in Past Cadillac Vehicle Discussion; In my car its been lacking power and shuts down is it possivle its the comeputher?...
  1. #1
    91deville1st is offline Cadillac Owners Member
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    what does the computer look like and where is it on a 91 deville

    In my car its been lacking power and shuts down is it possivle its the comeputher?

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: what does the computer look like and where is it on a 91 deville

    The "computer" (ECM - Engine Control Module or ECU - Engine Control Unit) might be behind the right front passenger's right foot kick panel.

    Probably not the problem, but someone with a '91 will have to chime in .............

  4. #3
    basscatt's Avatar
    basscatt is offline Cadillac Owners Master
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    Re: what does the computer look like and where is it on a 91 deville

    it's almost NEVER the computer - but it's the first thing people blame -

    rather than throwing a bunch of parts at the problem
    and HOPING to stumble on the solution -

    why not diagnose the problem and fix it?

    start by checking for codes -
    if you don't know how - go here and read the ENTIRE post -

    http://www.cadillacforums.com/forums...odes-dtcs.html

    if you have any codes - post them here -
    ALONG WITH THEIR DEFINITIONS -

  5. #4
    91deville1st is offline Cadillac Owners Member
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    E23-EST signal problem
    E27- open throttle switch signal
    E31- shorted MAP sensor signal
    E40- open power steering pressure switch signal
    E52- PCM memory reset (see note)
    E53- Distributor signal interrupt
    E58- pass key control problem
    E91- PRNDL switch problem
    E98- high RPM P/N to D/R in isc range these are the codes i got when i last checkef them

  6. #5
    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: what does the computer look like and where is it on a 91 deville

    That's a lot of codes. It sounds like it is losing battery connection from time to time. I would check the battery cables and the grounds.

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    basscatt is offline Cadillac Owners Master
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    Re: what does the computer look like and where is it on a 91 deville

    I agree with Al - check the battery terminals -
    wouldn't hurt to have the battery load-tested -

    if I was to guess - I would put my money on the ignition module -

    for now - I would suggest clearing all the codes -
    drive it - and see what comes back -

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    Ranger's Avatar
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    Re: what does the computer look like and where is it on a 91 deville

    E23 could be the lack of power and the E53 could be the "shut down". The distributor is the common denominator.

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    Re: what does the computer look like and where is it on a 91 deville

    I agree, check the battery connections. Also, especially in the northern climates, these C-bodies love to accumulate corroded grounds, creating the symptoms you are experiencing. Check all ground connections and cables thoroughly before replacing parts.

    To answer your question, the computer is located roughly where Sub told you - above the passenger's side kickpanel, behind the glovebox.

  10. #9
    91deville1st is offline Cadillac Owners Member
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    Oh ok thanks guys and i have switched out my distributor though and ill check the grounds amd all that

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    dennis93coupe's Avatar
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    Re: what does the computer look like and where is it on a 91 deville

    Quote Originally Posted by 91deville1st View Post
    Oh ok thanks guys and i have switched out my distributor though and ill check the grounds amd all that
    When you changed the distributor, was it a rebuilt or used? If it was a rebuilt, did it have a new harness inside the distributor?

  12. #11
    91deville1st is offline Cadillac Owners Member
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    It shouldve been rebuilt bought it at autozone and no it didnt come with it will that be the problem? If so would i be able to but that on the side?

  13. #12
    dennis93coupe's Avatar
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    Re: what does the computer look like and where is it on a 91 deville

    Don't know what the condition of yours is in. There have been reports of toasted harness and or connectors in distributors. You bought the distributor at autozone?

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    Re: what does the computer look like and where is it on a 91 deville

    Autozone distributes the same reman distributor that other parts houses do...

  15. #14
    dennis93coupe's Avatar
    dennis93coupe is offline Cadillac Owners Connoisseur
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    Re: what does the computer look like and where is it on a 91 deville

    Cardone is not the only reman distributor either....Unfortunately that is the only one they, autozone, offer. Read post #208 in this thread. I think you made quite few postings in this one drewsdeville... Even though rockauto is getting on the wrong foot with me having the wrong parts in their boxes, may be out of their control, and do nothing about it to correct the problem- they do have an alternative to cardone you get what you pay for with no harness, or the Autoline reman that has the harness and more components including a new cap and rotor. Like I said, you get what you pay for.

    http://www.cadillacforums.com/forums...s-over-14.html

  16. #15
    91deville1st is offline Cadillac Owners Member
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    So basicly autozone give people the same junk but just cleaned up and with some little new stuff? Wow so i spent 100 somethings dollars on junk and is there a way where i can get a new harness or am i going to be having to buy a whooole new oart?

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