1984 Eldorado code 15 won't start

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HT4100 4.1, 4.5, 4.9 Discussion, 1984 Eldorado code 15 won't start in Cadillac Engine Discussion; Recurrent problem while driving was a loss of power while accelerating but was intermittent. After the car got to cruising ...
  1. #1
    Cajuncody is offline Cadillac Owners Member
    Automobile(s): 1984 Eldorado
    Join Date
    Jan 2014

    1984 Eldorado code 15 won't start

    Recurrent problem while driving was a loss of power while accelerating but was intermittent. After the car got to cruising temp it faded away. This occurred even if you warmed it up for 10 minutes before driving and generally happened under a load such as climbing a hill. Today the car was started to warm up and it struggled then died. Would not start after that. When attempting to restart I smelled gas so I assumed it was flooded as our ongoing assumption was a choke problem. I drove another car and tried again when I got home. Turns over, gas smell, no start. Like no fire. Pulled the codes and got soft codes of 15 and 30 with a hard code of 38. Car always shows 38 even two Mat sensors in and a new ECM. Car also has new TPS.
    According to Haynes we need to replace either the ESC sensor or the ESC module but the book does show what they look like or where they are nor does it give a good break down of symptoms. Cadillac mechanics are rare and we are fairly proficient shade tree mechanics. Any advice for us on location, diagnosis, or other enlightening thoughts would be welcome.

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  3. #2
    83CADMAN's Avatar
    83CADMAN is offline Cadillac Owners Fanatic
    Automobile(s): 83 Eldorado, 90 Seville, 94 Concours
    Join Date
    Jun 2009
    Pacific Northwest

    Re: 1984 Eldorado code 15 won't start

    The HT4100 is cronicly inflicted with FLAT CAM SYNDROME. It will manifest as all kind of symptoms that tend to lead people to AZ or RA to spend all of their money on possible solutions, ie TPS, ISC, ICM, ECM...etc.
    I suguest pulling the drivers side valve cover and checking the rocker lift at #1 intake and exhaust. If the cam is good, go ahead with the systematac process of elimation and get the car going.
    If the cam is bad, you will never get it to perform right.
    Gas smell could be dead cyl?
    Replaced cam in my 83 a few years back and it's still running strong.
    To do it right requires special (reseal kit) intake manifold bolts and gasket.

  4. #3
    carnut is offline Cadillac Owners Master
    Automobile(s): 1999 BMW 740 Il. 2005 Jag XK8, 1988 Mercedes Benz 300 SE
    Join Date
    Feb 2003

    Re: 1984 Eldorado code 15 won't start

    The ESC module is inside the distributor where older cars points were. you've made no mention of verifying spark. If no spark, I would check to make sure the ground strap is in between the coil and cap and if it is, swapping the module is easier than points replacement. Just make sure you apply heat sink paste under it!

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