Question about 1987 Oldsmobile Delta 88

2 Answers

I have an 87 oldsmobile delta 88 royale brougham and I have a dianogistic done to it and the car would just die after 15 minutes at idle. The mechanic said it was the ignition control module. So I replaced that along with the 3 coils and let it run for about 15 min and it died again. Does anyone know what else could be the problem? Someone else had mentioned an idle sensor? If that's the problem, where is that located? And do you have to do any adjustments to the module or coils?

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  • Cory Fritchle Oct 03, 2010

    I have had 1 solution for my problem, but want to find someone else to give me some answers. I have an 87 oldsmobile delta 88 royale brougham and it will idle for 15 minutes and then die. I have had 2 responses and one mentioned an egr valve replacement? Any ideas?

  • Cory Fritchle Oct 03, 2010

    it won't start up rite after it dies. Gotta wait till it cools down for it to start again. Today I replaced the 3 coils and the ignition control module and it still dies after it idles for 15 minutes. I've had several solutions and they've all been different.

  • Cory Fritchle Oct 03, 2010

    I have an 87 oldsmobile delta 88 royale brougham and it will run/idle for 15 minutes and then die. It won't start back up until it has cooled down. I've replaced the coils and the ignition control module and it still dies after 15 minutes. I've had suggestions that it is a crankshaft sensor an idle sensor if this car even has one and an egr valve. Any other suggestions?

  • Cory Fritchle Oct 03, 2010

    It's a v6 3.8L

  • Cory Fritchle Oct 03, 2010

    How sure are you that it's the crankshaft sensor? I've been hearing a lot of problems of what it could be. So is it you think or you know that it's the crankshaft sensor? It sounds a little difficult to replace but is it doable without taking it to a mechanic? and what do you mean about wrap a paper match stick?

  • Cory Fritchle Oct 06, 2010

    I need to know when I change my crankshaft sensor do I just buy the sensor and use the hardware that's on the car or do I buy everything new? Thanks

  • Cory Fritchle Nov 28, 2010

    I just wanted to say thanks for all your helpful insight. It was fairly easy, nothing to it. It runs just like new now. Thanks again

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  • Master
  • 2,299 Answers

When the engine dies, does it start right back up? Usually when the coils go out they do exactly what you are saying. But the car will not start for about an hour after it dies. Or will start, but run really rough. I don't know if your car has an idle sensor. Or throttle positioning sensor. I don't think Olds came out with them until 91. If it does have one, then it will be on the throttle body, in front of the throttle actuator.

Posted on Oct 03, 2010

  • Rodney Clark
    Rodney Clark Oct 03, 2010

    I see that someone said that it is the EGR valve. I don't think that is the problem at all. What size engine is in this car? I mentioned before the coil is usually the cause of the car to start and run till it gets hot, then die and not start again till it cools down. This is a coil problem 99% of the time. And I will explain why. A coil is nothing more than the name. A coil of copper wire inside the coil. When copper, like any metal heats up it expands. And when it cools, it shrinks. When the coil gets hot, the copper expands and the wire in the coil separates. And the coil quits working. When it cools, the wire makes connection again. Letting the car start again. I was thinking that this car had HEI ignition. Which only has one coil. But I could be wrong. Don't work on a lot of these older cars much anymore. I would check the spark on each individual spark plug and see what you get. I bet that you find that you are not getting spark on 3 of the plugs.

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  • Master
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It was very very common for the crankshaft sensor to fail on these cars and it does so in exactly the same way you describe. The problem is, it's a little difficult to change. It is mounted down by the crank pulley, you have to remove the crank pulley and then reinstall it while making sure that the sensor is spaced correctly between the vanes of the pulley when it is reinstalled. Usually, the easiest way to do it is to wrap a paper match stick across the pulley vane as it passes through the sensor and then tighten the sensor down, using the match as a guide to center it.

Posted on Oct 03, 2010

  • Dave  C
    Dave C Oct 03, 2010

    Replace the crankshaft sensor.

  • Dave  C
    Dave C Oct 07, 2010

    This may be a job for a shop. It's not that easy. You'll have to remove the crankshaft pulley. This can be difficult if you have not done this kind of thing before or don't have the tools. After the crankshaft pulley has been removed, you'll see what I mean about using the match stick. The sensor has two halves that go on either side of a circular vane on the back of the crank pulley. The vane must be spaced in the middle of the sensor. The crank sensor has an adjustable mount. You mount it loosely and put the crank pulley back on with the paper match bent over the vane so that it centers the sensor, then you tighten the sensor mount.

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