'81 DeVille Diagnostic test?

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500, 472, 425, 368 Discussion, '81 DeVille Diagnostic test? in Cadillac Engine Discussion; On my '81 DeVille when I go to run the diagnostics test it shows 30 as the only code, 88 ...
  1. #1
    rollerz70 is offline Cadillac Owners Fanatic
    Join Date
    May 2004

    '81 DeVille Diagnostic test?

    On my '81 DeVille when I go to run the diagnostics test it shows 30 as the only code, 88 and 70 meaning the beging and end of it. When I start the car it starts and then after a few seconds trys to die until I put my foot on the gas a little. Is this the ISC or TPS? How can I test each to see what it is?
    After I get it to stop wanting to die, only does it for about 30 seconds when cold, it idles and runs just fine. Any thoughts? Thanks

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  3. #2
    Pianoman72 is offline Cadillac Owners Member
    Join Date
    Apr 2004

    Re: '81 DeVille Diagnostic test?

    This guy talks about how he fixed his code 30 but it's probably not as detailed as you would like...


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