Question about 1996 Cadillac Eldorado

2 Answers

I have a 1996 Eldorado. Every so offten, I experience an issue as if the car is going to stall. It gets very rough, and the service engine light comes on, and blinks, but after a few moments, it smooths out again. This is a very intermitant issue, but just a few days ago, the car stalled, and was very hard to start. Once started, it was roughter than normal (as stated above). This has since, smoothed out a little, but not to normal standards. Could this be an issue with the ignition system (coils, or ignition module) or a much bigger problem, like a valve issue? Please advise. Thank you in advance for your assistance with this situation.

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  • mathewsfam04 Oct 15, 2010

    Plugs were changed only a few months ago, and I have about 170,000 miles on it. The oil is fairly new, as I have a mild oil leak around the pan gasket, that causes me to add a quart of oil every two weeks, but a complete oil and filter change was done about six months ago, with only about 3000 miles added. I am going out to the car to check the codes as we read. Thank you for your responce.

  • mathewsfam04 Oct 15, 2010

    I have the codes. the are as follows.



    pc0300 current

    pc1640 history

    ac1240 history

    tc0073 current

    pz2471 history



    mathewsfam04@msn.com

  • mathewsfam04 Oct 15, 2010

    I acceced the computer via an acces procedure. I pushed the ac off button, while pushing the passenger temp button at the same time, them the codes were shown on the instrument display on the dash.

  • mathewsfam04 Oct 15, 2010

    I have a friend that has such a system. I will contact him and see if it is set up for GM products. I have in the past been told that the system I access is for all systems in the car, but I feel that they may be limited. I was able to detect an issue with suspention issues with it, but not all issues. Your information so far, has helped me learn that there are areas of diagnostics I will not be able to get to without proper equipment. I will give you the codes, as soon as I am able to get them. Is this OK?

  • mathewsfam04 Oct 16, 2010

    It helped me to look deeper into what the problem might be. With that being said, I found that the issue is not ignition, but something bigger. I will be doing work on the valves at the #7 cylinder, which may be sticking, or need to be replaced.

  • mathewsfam04 Oct 16, 2010

    I have a pressure reading of 0 in the #7 cylinder. I have a sucking sound comming from under the intake, which leads me to believe that I have a stuck valve. I will be removing the valve cover and checking clearences, and make sure that the rocker spring is not broke (if they used this old tech on this type of car). If you would like, I can send you pics of my car (custom paint-two tone), and maybe you can give some hints on a valve job on my own. If so, e-mail me at mathewsfam04@msn.com

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Your engine condition could be caused by many factors, and is difficult to pin point without knowing if there are any PCM trouble codes stored in memory. If the check engine light lites up, I am sure you would have a coded stored in memory, and would be the first place a I or a Technician would check before proceeding with diagnostic procedures. With this being said, When was the last time spark plugs or other maintenance was performed on this vehicle? How many miles are on the vehicle?

Posted on Oct 15, 2010

  • 2 more comments 
  • GetMeOttaHere Oct 15, 2010

    No problem.

  • GetMeOttaHere Oct 15, 2010

    Your vehicle is an OBDII system, and the codes your giving me are not OBDII. How did you get these codes and where were they displayed?

  • GetMeOttaHere Oct 15, 2010

    You need to connect a code reader to the ADL (assembly line diagnostic link) to access the PCM trouble codes. The codes your retrieving are for the climate control module.

  • GetMeOttaHere Oct 15, 2010

    Sure, comment back so we can proceed.

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  • 166 Answers

Sounds like you might have an intermittent misfire at one or more of the cylinders. Especially if the check engine light is blinking. A blinking check engine light indicated a misfire. I would start by looking at all the plugs, coils and wires to see which one is misfiring. But it is definitely in the ignition circuit. If you have the codes pulled from the engine control module it should tell you what cylinders are misfiring. The engine control module will store the codes even if the check engine light is no longer on.

Posted on Oct 15, 2010

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